--- title: "Cheap Flights from Ontario to Denver (DEN) from CA $57 - Expedia.ca" description: "Looking for low fare flights from Ontario (ONT) to Denver (DEN)? Search by flexible dates with one-way flights from CA $57 and roundtrip from CA $83." canonical: "https://www.expedia.ca/lp/flights/ont/den/ontario-intl-airport-to-denver" language: en-CA market: CA currency: CAD prices_as_of: 2026-11-14T06:40:10Z --- # CA $57 Cheap Flights from Ontario Intl. Airport (ONT) to Denver (DEN) ![An escalator in a modern building with geometric wall patterns and overhead lighting.](https://images.trvl-media.com/place/5129540/2bacbc37-ca58-4ac2-9d2f-734c1a54e4f9.jpg?impolicy=fcrop&w=1200&h=500&q=medium) [View CA $57 flight on Wed, Dec 30, 2026](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:30/12/2026TANYT&trip=oneway&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:56.45&airProductToken=AQoxCi8IxnISBDE1MDAYrpsBIINpKKaXoQMwtpihAzhFQABYAWoEUENfMXIHWjIxWFhTMxIKCAEQARgBKgJGORgBIgQIARABKAIoAygEMA0) Photo by Photo Courtesy of Denver International Airport ## Popular airlines from Ontario Intl. Airport (ONT) to Denver International Airport (DEN) [Frontier Airlines](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:28/11/2026TANYT&leg2=from:DEN,to:ONT,departure:05/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"F9"}}]) [Alaska Airlines](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:28/11/2026TANYT&leg2=from:DEN,to:ONT,departure:05/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AS"}}]) [Southwest Airlines](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:28/11/2026TANYT&leg2=from:DEN,to:ONT,departure:05/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"WN"}}]) [United](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:28/11/2026TANYT&leg2=from:DEN,to:ONT,departure:05/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"UA"}}]) [American Airlines](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:28/11/2026TANYT&leg2=from:DEN,to:ONT,departure:05/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"AA"}}]) [Delta](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:28/11/2026TANYT&leg2=from:DEN,to:ONT,departure:05/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&filters=[{"preferredAirlineFilterValue":{"carrierCode":"DL"}}]) ### Be in the know Get alerts if flight prices drop or rise\* ### Book smarter Save up to 30% on select hotels after you book a flight\* ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.ca/login) ## Cheap Flights from Ontario to Denver (ONT-DEN) Prices were available within the past 7 days and start at CA $57 for one-way flights and CA $83 for roundtrip, for the period specified. Prices and availability are subject to change. All deals One way Roundtrip [Select Frontier Airlines flight, departing Sat, Dec 12 from Ontario to Denver, returning Tue, Dec 15, priced at CA $83 Found 2 days ago](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:12/12/2026TANYT&leg2=from:DEN,to:ONT,departure:15/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:82.23&airProductToken=AQoyCjAIxnISBDE1MDAYrpsBIINpKMjMnwMw2M2fAzhFQABYAWoEUENfMXIISzIxU1hTOUEKMgowCMZyEgQxNDk5GINpIK6bASjr9J8DMPn1nwM4RUAAWAFqBFBDXzFyCEsyMUVYUzlBEgoIARABGAEqAkY5GAEiBAgBEAEoAigDKAQwDQ) Sat, Dec 12 - Tue, Dec 15 · ONT · DEN · Roundtrip [Select Frontier Airlines flight, departing Wed, Dec 2 from Ontario to Denver, returning Tue, Dec 8, priced at CA $83 Found 23 hours ago](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:02/12/2026TANYT&leg2=from:DEN,to:ONT,departure:08/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:82.68&airProductToken=AQozCjEIxnISBDI5MDgYrpsBIINpKNLengMw39-eAzhLQABYAWoFQmFzaWNyCEsxNFhYUzlBCjMKMQjGchIEMjkwNxiDaSCumwEo1KCfAzDloZ8DOEtAAFgBagVCYXNpY3IISzIxRVhTOUESDAgBEAIYASoCRjkyABgBIgQIARABKAIoAygEKAYwDQ) Wed, Dec 2 - Tue, Dec 8 · ONT · DEN · Roundtrip [Select Frontier Airlines flight, departing Tue, Dec 8 from Ontario to Denver, returning Sat, Dec 12, priced at CA $97 Found 5 days ago](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:08/12/2026TANYT&leg2=from:DEN,to:ONT,departure:12/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:96.01&airProductToken=AQoyCjAIxnISBDI5MDgYrpsBIINpKJKinwMwo6OfAzhLQABYAWoFQmFzaWNyB0syMUVYUzMKMgowCMZyEgQyOTA3GINpIK6bASjUzZ8DMOXOnwM4S0AAWAFqBUJhc2ljcgdLMjFTWFMzEgwIARACGAEqAkY5MgAYASIECAEQASgCKAMoBCgGMA0) Tue, Dec 8 - Sat, Dec 12 · ONT · DEN · Roundtrip [Select Frontier Airlines flight, departing Sat, Dec 5 from Ontario to Denver, returning Tue, Dec 8, priced at CA $99 Found 23 hours ago](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:05/12/2026TANYT&leg2=from:DEN,to:ONT,departure:08/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:98.37&airProductToken=AQoyCjAIxnISBDE1MDAYrpsBIINpKOj9ngMw-P6eAzhaQABYAWoFQmFzaWNyB1oyMVNYUzMKMwoxCMZyEgQyOTA3GINpIK6bASjUoJ8DMOWhnwM4WkAAWAFqBUJhc2ljcghLMjFFWFM5QRIMCAEQAhgBKgJGOTIAGAEiBAgBEAEoAigDKAQoBjAN) Sat, Dec 5 - Tue, Dec 8 · ONT · DEN · Roundtrip [Select Frontier Airlines flight, departing Wed, Dec 2 from Ontario to Denver, returning Wed, Dec 2, priced at CA $99 Found 3 days ago](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:02/12/2026TANYT&leg2=from:DEN,to:ONT,departure:02/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:98.78&airProductToken=AQoyCjAIxnISBDI5MDgYrpsBIINpKNLengMw39-eAzhLQABYAWoFQmFzaWNyB0syMVhYUzMKMgowCMZyEgQxMjYxGINpIK6bASjL4p4DMNzjngM4S0AAWAFqBUJhc2ljcgdLMjFYWFMzEgwIARACGAEqAkY5MgAYASIECAEQASgCKAMoBCgGMA0) Wed, Dec 2 - Wed, Dec 2 · ONT · DEN · Roundtrip [Select Frontier Airlines flight, departing Sat, Jan 23 from Ontario to Denver, returning Mon, Jan 25, priced at CA $140 Found 2 days ago](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:23/01/2027TANYT&leg2=from:DEN,to:ONT,departure:25/01/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:139.60&airProductToken=AQozCjEIxnISBDE1MDAYrpsBIINpKJGlowMwnqajAzhLQABYAWoFQmFzaWNyCEsyMVNYUzlBCjMKMQjGchIEMjkwNxiDaSCumwEos7yjAzDPvaMDOEtAAFgBagVCYXNpY3IIUjE0TlhTOUESDAgBEAIYASoCRjkyABgBIgQIARABKAIoAygEKAYwDQ) Sat, Jan 23 - Mon, Jan 25 · ONT · DEN · Roundtrip [Select Delta flight, departing Sat, Dec 12 from Ontario to Denver, returning Tue, Dec 15, priced at CA $196 Found 2 days ago](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:12/12/2026TANYT&leg2=from:DEN,to:ONT,departure:15/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:195.62&airProductToken=AQpvCjYIxJgBEgQyNzA4GK6bASDyEijIzJ8DMLbNnwM4RUAAWAFqCU1BSU5CQVNJQ3IIVkFWU0gzQkMKNQjEmAESBDE1NTMY8hIgg2kok86fAzDzzp8DOEVAAVgBaglNQUlOQkFTSUNyCFZBVlNIM0JDEgoIARABGAEqAkRMGAEiBAgBEAEoAigDKAQwAQ) Sat, Dec 12 - Tue, Dec 15 · ONT · DEN · Roundtrip [Select Alaska Airlines flight, departing Tue, Feb 2 from Ontario to Denver, returning Sat, Feb 6, priced at CA $266 Found 2 days ago](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:02/02/2027TANYT&leg2=from:DEN,to:ONT,departure:06/02/2027TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:266.00&airProductToken=AQpfCi4IwaYBEgM2NzcYrpsBIJIBKJaYpAMwwJmkAzhYQABYAWoCU1ZyCEdIMk9YSkJOCi0IwaYBEgM0MjEYkgEgg2ko9JmkAzCUm6QDOFhAAVgBagJTVnIIR0gyT1hKQk4KYgouCMGmARIDNzE0GINpIO-4ASimxqQDMNLHpAM4WEAAWAFqAlNWcghHSDJPWEpCTgowCMGmARIEMTUyNxjvuAEgrpsBKIXIpAMwk8mkAzhYQAFYAWoCU1ZyCEdIMk9YSkJOEgoIARABGAEqAkFTGAEiBAgBEAEoAigDKAQwAQ) Tue, Feb 2 - Sat, Feb 6 · ONT · DEN · Roundtrip [Select American Airlines flight, departing Sat, Dec 12 from Ontario to Denver, returning Tue, Dec 15, priced at CA $266 Found 2 days ago](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:12/12/2026TANYT&leg2=from:DEN,to:ONT,departure:15/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:266.00&airProductToken=AQppCjMIwYIBEgQxNTkxGK6bASDvuQEo5syfAzC7zZ8DOEJAAFgBagVCQVNJQ3IIT1ZBSVVTQlYKMgjBggESBDE0MTQY77kBIINpKOPNnwMw2s6fAzhCQAFYAWoFQkFTSUNyCE9WQUlVU0JWCmkKMgjBggESBDI0NDcYg2kg77kBKOzwnwMw6PGfAzhCQABYAWoFQkFTSUNyCE9WQUlVU0JWCjMIwYIBEgQ0MTQ0GO-5ASCumwEowPKfAzCU858DOEJAAVgBagVCQVNJQ3IIT1ZBSVVTQlYSCggBEAEYASoCQUEYASIECAEQASgCKAMoBDAL) Sat, Dec 12 - Tue, Dec 15 · ONT · DEN · Roundtrip [Select United flight, departing Wed, Dec 23 from Ontario to Denver, returning Tue, Dec 29, priced at CA $451 Found 8 hours ago](https://www.expedia.ca/Flights-Search?leg1=from:ONT,to:DEN,departure:23/12/2026TANYT&leg2=from:DEN,to:ONT,departure:29/12/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&flp=mdl:flights-flex-module,price:450.10&airProductToken=AQojCiEI1YIBEgQyNDQ2GK6bASCDaSjsx6ADMPnIoAM4S0AAWAEKRQogCNWCARIEMjM2NxiDaSCycSjwiqEDMJ2MoQM4S0AAWAEKIQjVggESBDI2NjEYsnEgrpsBKPmNoQMwzo6hAzhLQAFYARIKCAEQARgBKgJVQRgBIgQIARABKAQwAQ) Wed, Dec 23 - Tue, Dec 29 · ONT · DEN · Roundtrip ## Find the cheapest month to fly from Ontario (ONT) to Denver (DEN) ### December is typically the cheapest month to fly From CA $62 - CA $299 per traveller. View flights in December Insights are based on prices from searches for economy trips of 10 days or less on our sites in the last 12 months. Insights are informative only and current prices may differ. ## Book with confidence ### Ontario to Denver Flights #### The easy way to book your flights from Ontario Intl. Airport to Denver With Expedia, it’s simple to find and book flights to Denver from Ontario Intl. Airport whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 6 airlines that cover this route. There are United Airlines, Frontier Airlines nonstop flights to Denver Intl., too. Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Ontario Intl. Airport to Denver today, tomorrow, or this week. #### Save dollars with cheap flights from Ontario Intl. Airport, ONT to Denver Intl., DEN Sort your search results by price to find great deals on your flight from Ontario Intl. Airport to Denver—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Denver from Ontario Intl. Airport currently is just CA $83 rising to CA $451\. Here are more money-saving tips: - Fly in December when flight prices are normally at their lowest - Book about a month to 6 weeks before you travel for the best prices to Denver - Avoid peak season and weekends when flights can cost more - Early morning and late-night flights are sometimes cheaper, so try varying your travel times - One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! #### Reasons to choose Expedia for your flight to Denver from Ontario Intl. Airport Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to Denver with Expedia today. ## Frequently Asked Questions ### How much does a flight from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) cost? You can find cheap one-way flights from CA $57 and cheap return flights CA $83 ONT to DEN with Expedia. Return flights often range between CA$578 and CA$1511\. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when ONT to DEN ticket fares go up or down. ### What is the cheapest month to fly from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? The cheapest months to fly from ONT to DEN are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route. ### Which airlines fly direct from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? There are 3 airlines offering direct flights from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.). Here are the top carriers: \* Southwest Airlines operates 26 direct flights from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) every week. \* United operates 17 direct flights from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) every week. \* Frontier Airlines operates 14 direct flights from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) every week. ### How do I find cheap flights from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? To find a cheap flight from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up [Price Tracking](https://www.expedia.ca/why/price-tracking) and receive alerts when fares go up or down. ### What is the best airline to fly with from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? The best airline to fly with from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) will differ from traveler to traveler. If you like to fly early, Frontier Airlines offers early morning flights. If price is the most important factor, Frontier Airlines typically offers the lowest fares. Southwest Airlines offers the most daily flights from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access. ### What is the best time to fly from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience. ### How many flights per day from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? You'll find around 8 nonstop flights per day from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.). For even more choices, look at flights that include layovers, as there are approximately 74 connecting flights per day. Some common connection points include Harry Reid Intl. (LAS), Portland Intl. (PDX), and Sky Harbor Intl. (PHX). ### What is the earliest flight from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? The earliest flight from Ontario Intl. Airport (ONT) to Denver Intl. (DEN) typically departs around 12:55 AM local time, operated by American Airlines. This is a seasonal service, active in August and September. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search. ### What day of the week has the most flights from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? You'll typically find the most flights from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) on a Friday, with around 64 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, Alaska Airlines, and American Airlines. Fridays offer notably more flight options compared to other days of the week, making it a popular choice for travellers. ### What are the most popular departure times for flights from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? The most popular departure times for flights from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) are in the early morning, from 6am to 9am. Many major carriers, including Southwest Airlines, Frontier Airlines and Alaska Airlines, offer flights during this window. Many travellers prefer this time because it allows for an early start to their day in Denver. ### How long does it take to fly from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? A direct flight from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) typically takes around 2 hours 18 minutes. This route covers a distance of approximately 1,315 kilometres. If you opt for a flight with one stop, your travel time will be significantly longer, usually around 8 hours. Flights with two or more stops generally take even longer, averaging about 9 hours 18 minutes. Keep in mind that actual flight times can vary due to factors like wind patterns and air traffic, so it's always a good idea to allow for some extra time when planning your trip. ### Can you fly business or first class from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? You can fly business class or first class between ONT and DEN. You can fly business class with Frontier Airlines and Delta. First class cabins are available on Alaska Airlines, Delta, United, and American Airlines. ### How do I earn miles on a Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) flight with Expedia? It's easy to earn miles on a Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of [One Key™](https://www.expedia.ca/welcome-one-key), you can also earn OneKeyCash™\* on top of your airline miles when you book with Expedia. \*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands. ### What airports do you fly into for Denver, CO (DEN) from Ontario Intl. Airport (ONT)? If you're planning to travel to Denver from Los Angeles - Ontario Intl. (ONT), you can fly directly into Denver Intl. (DEN). Some flights may connect through major hubs like Portland Intl. (PDX), Seattle - Tacoma Intl. (SEA), or Harry Reid International Airport (LAS) before reaching Denver. Compare routes and airports on Expedia to find the best flight options for your travel plans. ### Is it cheaper to buy a plane ticket from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) at the last minute? Typically, booking a last minute flight from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare. ### Is it cheaper to book a Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) flight and hotel package? Securing a Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) [flight and hotel package](https://www.expedia.ca/denver.d178254.destination-travel-guides) is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars. ### Can I cancel or change the date of my flight from Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.)? If you booked your Ontario Intl. Airport (ONT) to Denver, CO (DEN-Denver Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in [your itinerary](https://www.expedia.ca/trips) or confirmation email. Or, head to our [Customer Service portal](https://www.expedia.ca/helpcenter/) if you'd like more information. ## Travel information | Origin airport | Ontario Intl. Airport | | ------------------- | ---------------------------------------------------------------------------------------- | | Destination airport | Denver International Airport | | Distance | 1,313 km away | | Airlines serving | Frontier Airlines, Alaska Airlines, Southwest Airlines, United, American Airlines, Delta | | Popular airline | Frontier Airlines | | Roundtrip price | CA $83 | | Average flight time | 2 hours 21 mins | ## Explore a world of travel with Expedia - [Flights](?equalTargetTab=tab-0) - [Flights from Tampa (TPA) to Denver (DEN)](https://www.expedia.ca/lp/flights/tpa/den/tampa-to-denver) - [Flights from Toronto (YYZ) to Denver (DEN)](https://www.expedia.ca/lp/flights/yyz/den/toronto-to-denver) - [Flights from Kansas City (MCI) to Denver (DEN)](https://www.expedia.ca/lp/flights/mci/den/kansas-city-to-denver) - [Flights from Plattsburgh (PBG) to Denver (DEN)](https://www.expedia.ca/lp/flights/pbg/den/plattsburgh-to-denver) - [Flights from St. John's (YYT) to Denver (DEN)](https://www.expedia.ca/lp/flights/yyt/den/st-johns-to-denver) - [Flights from Oklahoma City (OKC) to Denver (DEN)](https://www.expedia.ca/lp/flights/okc/den/oklahoma-city-to-denver) - [Flights from Salt Lake City (SLC) to Denver (DEN)](https://www.expedia.ca/lp/flights/slc/den/salt-lake-city-to-denver) - [Flights from Newark Liberty Intl. Airport (EWR) to Denver (DEN)](https://www.expedia.ca/lp/flights/ewr/den/newark-liberty-intl-airport-to-denver) - [Flights from Phoenix (PHX) to Denver (DEN)](https://www.expedia.ca/lp/flights/phx/den/phoenix-to-denver) - [Flights from Calgary (YYC) to Denver (DEN)](https://www.expedia.ca/lp/flights/yyc/den/calgary-to-denver) - [Flights from Austin (AUS) to Denver (DEN)](https://www.expedia.ca/lp/flights/aus/den/austin-to-denver) - [Flights from Hartford (BDL) to Denver (DEN)](https://www.expedia.ca/lp/flights/bdl/den/hartford-to-denver) - [Flights from Great Falls (GTF) to Denver (DEN)](https://www.expedia.ca/lp/flights/gtf/den/great-falls-to-denver) - [Flights from New York (LGA) to Denver (DEN)](https://www.expedia.ca/lp/flights/lga/den/new-york-to-denver) - [Flights from Ottawa (YOW) to Denver (DEN)](https://www.expedia.ca/lp/flights/yow/den/ottawa-to-denver) - [Flights from Charlottetown Alexander B. Campbell Airport (YYG) to Denver (DEN)](https://www.expedia.ca/lp/flights/yyg/den/charlottetown-to-denver) - [Flights from Palm Springs (PSP) to Denver (DEN)](https://www.expedia.ca/lp/flights/psp/den/palm-springs-to-denver) - [Flights from Halifax (YHZ) to Denver (DEN)](https://www.expedia.ca/lp/flights/yhz/den/halifax-to-denver) - [Flights from St. Louis (STL) to Denver (DEN)](https://www.expedia.ca/lp/flights/stl/den/st-louis-to-denver) - [Flights from Cleveland (CLE) to Denver (DEN)](https://www.expedia.ca/lp/flights/cle/den/cleveland-to-denver) - [Flights from San Francisco (SFO) to Denver (DEN)](https://www.expedia.ca/lp/flights/sfo/den/san-francisco-to-denver) - [Flights from Regina (YQR) to Denver (DEN)](https://www.expedia.ca/lp/flights/yqr/den/regina-to-denver) - [Flights from Philadelphia (PHL) to Denver (DEN)](https://www.expedia.ca/lp/flights/phl/den/philadelphia-to-denver) - [Flights from Atlanta (ATL) to Denver (DEN)](https://www.expedia.ca/lp/flights/atl/den/atlanta-to-denver) - [Flights from Los Angeles (LAX) to Denver (DEN)](https://www.expedia.ca/lp/flights/lax/den/los-angeles-to-denver) - [Flights from Toronto (YTZ) to Denver (DEN)](https://www.expedia.ca/lp/flights/ytz/den/toronto-to-denver) - [Flights from Grande Prairie (YQU) to Denver (DEN)](https://www.expedia.ca/lp/flights/yqu/den/grande-prairie-to-denver) - [Flights from Vancouver (YVR) to Denver (DEN)](https://www.expedia.ca/lp/flights/yvr/den/vancouver-to-denver) - [Flights from Thunder Bay (YQT) to Denver (DEN)](https://www.expedia.ca/lp/flights/yqt/den/thunder-bay-to-denver) - [Flights from Moab (CNY) to Denver (DEN)](https://www.expedia.ca/lp/flights/cny/den/moab-to-denver) - [Flights from Abbotsford (YXX) to Denver (DEN)](https://www.expedia.ca/lp/flights/yxx/den/abbotsford-to-denver) - [Flights from Omaha (OMA) to Denver (DEN)](https://www.expedia.ca/lp/flights/oma/den/omaha-to-denver) - [Flights from Kelowna (YLW) to Denver (DEN)](https://www.expedia.ca/lp/flights/ylw/den/kelowna-to-denver) - [Flights from Duluth (DLH) to Denver (DEN)](https://www.expedia.ca/lp/flights/dlh/den/duluth-to-denver) - [Flights from Ogdensburg (OGS) to Denver (DEN)](https://www.expedia.ca/lp/flights/ogs/den/ogdensburg-to-denver) - [Flights from Comox (YQQ) to Denver (DEN)](https://www.expedia.ca/lp/flights/yqq/den/comox-to-denver) - [Flights from Minneapolis (MSP) to Denver (DEN)](https://www.expedia.ca/lp/flights/msp/den/minneapolis-to-denver) - [Flights from Syracuse (SYR) to Denver (DEN)](https://www.expedia.ca/lp/flights/syr/den/syracuse-to-denver) - [Flights from Bangor (BGR) to Denver (DEN)](https://www.expedia.ca/lp/flights/bgr/den/bangor-to-denver) - [Flights from Lethbridge (YQL) to Denver (DEN)](https://www.expedia.ca/lp/flights/yql/den/lethbridge-to-denver) - [Flights from Saskatoon (YXE) to Denver (DEN)](https://www.expedia.ca/lp/flights/yxe/den/saskatoon-to-denver) - [Flights from Baltimore (BWI) to Denver (DEN)](https://www.expedia.ca/lp/flights/bwi/den/baltimore-to-denver) - [Flights from Minot (MOT) to Denver (DEN)](https://www.expedia.ca/lp/flights/mot/den/minot-to-denver) - [Flights from Charlotte (CLT) to Denver (DEN)](https://www.expedia.ca/lp/flights/clt/den/charlotte-to-denver) - [Flights from Indianapolis (IND) to Denver (DEN)](https://www.expedia.ca/lp/flights/ind/den/indianapolis-to-denver) - [Flights from Nanaimo (YCD) to Denver (DEN)](https://www.expedia.ca/lp/flights/ycd/den/nanaimo-to-denver) - [Flights from Miami (MIA) to Denver (DEN)](https://www.expedia.ca/lp/flights/mia/den/miami-to-denver) - [Flights from Seattle (SEA) to Denver (DEN)](https://www.expedia.ca/lp/flights/sea/den/seattle-to-denver) - [Flights from Edmonton (YEG) to Denver (DEN)](https://www.expedia.ca/lp/flights/yeg/den/edmonton-to-denver) - [Flights from Winnipeg (YWG) to Denver (DEN)](https://www.expedia.ca/lp/flights/ywg/den/winnipeg-to-denver) - [Flights from San Jose (SJC) to Denver (DEN)](https://www.expedia.ca/lp/flights/sjc/den/san-jose-to-denver) - [Flights from Fargo (FAR) to Denver (DEN)](https://www.expedia.ca/lp/flights/far/den/fargo-to-denver) - [Flights from Prince George (YXS) to Denver (DEN)](https://www.expedia.ca/lp/flights/yxs/den/prince-george-to-denver) - [Flights from Sault Ste. Marie (CIU) to Denver (DEN)](https://www.expedia.ca/lp/flights/ciu/den/sault-ste-marie-to-denver) - [Flights from Hamilton (YHM) to Denver (DEN)](https://www.expedia.ca/lp/flights/yhm/den/hamilton-to-denver) - [Flights from Chicago (ORD) to Denver (DEN)](https://www.expedia.ca/lp/flights/ord/den/chicago-to-denver) - [Flights from Raleigh (RDU) to Denver (DEN)](https://www.expedia.ca/lp/flights/rdu/den/raleigh-to-denver) - [Flights from Nanaimo (ZNA) to Denver (DEN)](https://www.expedia.ca/lp/flights/zna/den/nanaimo-to-denver) - [Flights from Kalispell (FCA) to Denver (DEN)](https://www.expedia.ca/lp/flights/fca/den/kalispell-to-denver) - [Flights from Grand Forks (GFK) to Denver (DEN)](https://www.expedia.ca/lp/flights/gfk/den/grand-forks-to-denver) - [Flights from Kamloops (YKA) to Denver (DEN)](https://www.expedia.ca/lp/flights/yka/den/kamloops-to-denver) - [Flights from Houston (IAH) to Denver (DEN)](https://www.expedia.ca/lp/flights/iah/den/houston-to-denver) - [Flights from Las Vegas (LAS) to Denver (DEN)](https://www.expedia.ca/lp/flights/las/den/las-vegas-to-denver) - [Flights from New York (JFK) to Denver (DEN)](https://www.expedia.ca/lp/flights/jfk/den/new-york-to-denver) - [Flights from Dallas (DFW) to Denver (DEN)](https://www.expedia.ca/lp/flights/dfw/den/dallas-to-denver) - [Flights from Sudbury (YSB) to Denver (DEN)](https://www.expedia.ca/lp/flights/ysb/den/sudbury-to-denver) - [Flights from Orange County (SNA) to Denver (DEN)](https://www.expedia.ca/lp/flights/sna/den/orange-county-to-denver) - [Flights from Boston (BOS) to Denver (DEN)](https://www.expedia.ca/lp/flights/bos/den/boston-to-denver) - [Flights from Cincinnati (CVG) to Denver (DEN)](https://www.expedia.ca/lp/flights/cvg/den/cincinnati-to-denver) - [Flights from Québec (YQB) to Denver (DEN)](https://www.expedia.ca/lp/flights/yqb/den/quebec-to-denver) - [Flights from Aspen (ASE) to Denver (DEN)](https://www.expedia.ca/lp/flights/ase/den/aspen-to-denver) - [Flights from Victoria (YYJ) to Denver (DEN)](https://www.expedia.ca/lp/flights/yyj/den/victoria-to-denver) - [Flights from Albuquerque (ABQ) to Denver (DEN)](https://www.expedia.ca/lp/flights/abq/den/albuquerque-to-denver) - [Flights from Buffalo (BUF) to Denver (DEN)](https://www.expedia.ca/lp/flights/buf/den/buffalo-to-denver) - [Flights from Moncton (YQM) to Denver (DEN)](https://www.expedia.ca/lp/flights/yqm/den/moncton-to-denver) - [Flights from Burlington (BTV) to Denver (DEN)](https://www.expedia.ca/lp/flights/btv/den/burlington-to-denver) - [Flights from Fort Lauderdale (FLL) to Denver (DEN)](https://www.expedia.ca/lp/flights/fll/den/fort-lauderdale-to-denver) - [Flights from New Orleans (MSY) to Denver (DEN)](https://www.expedia.ca/lp/flights/msy/den/new-orleans-to-denver) - [Flights from Billings (BIL) to Denver (DEN)](https://www.expedia.ca/lp/flights/bil/den/billings-to-denver) - [Flights from Orlando (MCO) to Denver (DEN)](https://www.expedia.ca/lp/flights/mco/den/orlando-to-denver) - [Flights from Detroit (DTW) to Denver (DEN)](https://www.expedia.ca/lp/flights/dtw/den/detroit-to-denver) - [Flights from Portland (PDX) to Denver (DEN)](https://www.expedia.ca/lp/flights/pdx/den/portland-to-denver) - [Flights from Washington (DCA) to Denver (DEN)](https://www.expedia.ca/lp/flights/dca/den/washington-to-denver) - [Flights from Windsor (YQG) to Denver (DEN)](https://www.expedia.ca/lp/flights/yqg/den/windsor-to-denver) - [Flights from International Falls (INL) to Denver (DEN)](https://www.expedia.ca/lp/flights/inl/den/international-falls-to-denver) - [Flights from Colorado Springs (COS) to Denver (DEN)](https://www.expedia.ca/lp/flights/cos/den/colorado-springs-to-denver) - [Flights from Montreal (YUL) to Denver (DEN)](https://www.expedia.ca/lp/flights/yul/den/montreal-to-denver) - [Flights from London (YXU) to Denver (DEN)](https://www.expedia.ca/lp/flights/yxu/den/london-to-denver) - [Flights from Spokane (GEG) to Denver (DEN)](https://www.expedia.ca/lp/flights/geg/den/spokane-to-denver) - [Flights from Cheyenne (CYS) to Denver (DEN)](https://www.expedia.ca/lp/flights/cys/den/cheyenne-to-denver) - [Flights from Honolulu (HNL) to Denver (DEN)](https://www.expedia.ca/lp/flights/hnl/den/honolulu-to-denver) - [Flights from Fredericton (YFC) to Denver (DEN)](https://www.expedia.ca/lp/flights/yfc/den/fredericton-to-denver) - [Flights from London (LHR) to Denver (DEN)](https://www.expedia.ca/lp/flights/lhr/den/london-to-denver) - [Flights from Nashville (BNA) to Denver (DEN)](https://www.expedia.ca/lp/flights/bna/den/nashville-to-denver) - [Flights from Portland (PWM) to Denver (DEN)](https://www.expedia.ca/lp/flights/pwm/den/portland-to-denver) - [Flights from Kitchener (YKF) to Denver (DEN)](https://www.expedia.ca/lp/flights/ykf/den/kitchener-to-denver) - [Flights from Bellingham (BLI) to Denver (DEN)](https://www.expedia.ca/lp/flights/bli/den/bellingham-to-denver) - [Flights from Detroit (DTT) to Denver (DEN)](https://www.expedia.ca/lp/flights/dtt/den/detroit-to-denver) - [Flights from San Diego (SAN) to Denver (DEN)](https://www.expedia.ca/lp/flights/san/den/san-diego-to-denver) - [Flights from Washington (IAD) to Denver (DEN)](https://www.expedia.ca/lp/flights/iad/den/washington-to-denver) \*Available to Expedia members. ## Other language versions ```yaml hreflang: x-default: https://www.expedia.com/lp/flights/ont/den/ontario-intl-airport-to-denver en-US: https://www.expedia.com/lp/flights/ont/den/ontario-intl-airport-to-denver en-IN: https://www.expedia.co.in/lp/flights/ont/den/ontario-intl-airport-to-denver en-CA: https://www.expedia.ca/lp/flights/ont/den/ontario-intl-airport-to-denver en-HK: https://www.expedia.com.hk/en/lp/flights/ont/den/ontario-intl-airport-to-denver es-MX: https://www.expedia.mx/lp/vuelos/ont/den/aeropuerto-internacional-laontario-a-denver ja-JP: https://www.expedia.co.jp/lp/flights/ont/den/ontario-intl-airport-to-denver ar: https://www.expedia.sa/lp/flights/ont/den/ontario-intl-airport-to-denver sv-SE: https://www.expedia.se/lp/flyg/ont/den/ontario-intl-airport-till-denver nl-BE: https://www.expedia.be/lp/vluchten/ont/den/ontario-naar-denver it-IT: https://www.expedia.it/lp/voli/ont/den/aeroporto-internazionale-di-ontario-a-denver en-NZ: https://www.expedia.co.nz/lp/flights/ont/den/ontario-intl-airport-to-denver zh-CN: https://www.expedia.com/cn/lp/flights/ont/den/ontario-intl-airport-to-denver en-GB: https://www.expedia.co.uk/lp/flights/ont/den/ontario-intl-airport-to-denver es: https://www.expedia.com/es/lp/vuelos/ont/den/aeropuerto-internacional-laontario-a-denver en-TW: https://www.expedia.com.tw/en/lp/flights/ont/den/ontario-intl-airport-to-denver pt-BR: https://www.expedia.com.br/lp/voos/ont/den/aeroporto-internacional-de-ontario-para-denver ```