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CA $254 Cheap Flights from Baltimore (BWI) to Ontario Intl. Airport (ONT)

View CA $254 flight on Wed, Sep 9, 2026Opens in a new window

Popular airlines from Baltimore Washington International Airport (BWI) to Ontario Intl. Airport (ONT)

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Cheap flights from Baltimore (BWI) to Ontario Intl. Airport (ONT)

Prices were available within the past 7 days and start at CA $254 for one-way flights and CA $580 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, Sep 9 - Wed, Sep 23
BWI
Baltimore
ONT
Ontario
CA $580 Roundtrip, found 1 day ago
CA $580
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Sep 9 from Baltimore to Ontario, returning Wed, Sep 23, priced at CA $580 found 1 day ago
Delta
Wed, Sep 9 - Wed, Sep 23
BWI
Baltimore
ONT
Ontario
CA $595 Roundtrip, found 1 day ago
CA $595
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Sep 9 from Baltimore to Ontario, returning Wed, Sep 23, priced at CA $595 found 1 day ago
American Airlines
Wed, Sep 9 - Wed, Sep 23
BWI
Baltimore
ONT
Ontario
CA $653 Roundtrip, found 1 day ago
CA $653
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Sep 9 from Baltimore to Ontario, returning Wed, Sep 23, priced at CA $653 found 1 day ago
Delta
Wed, Sep 9 - Wed, Sep 23
BWI
Baltimore
ONT
Ontario
CA $666 Roundtrip, found 1 day ago
CA $666
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Sep 9 from Baltimore to Ontario, returning Wed, Sep 23, priced at CA $666 found 1 day ago
Delta
Wed, Sep 9 - Wed, Sep 23
BWI
Baltimore
ONT
Ontario
CA $669 Roundtrip, found 1 day ago
CA $669
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Sep 9 from Baltimore to Ontario, returning Wed, Sep 23, priced at CA $669 found 1 day ago
American Airlines
Wed, Sep 9 - Wed, Sep 23
BWI
Baltimore
ONT
Ontario
CA $679 Roundtrip, found 1 day ago
CA $679
Roundtrip
found 1 day ago
Select American Airlines flight, departing Wed, Sep 9 from Baltimore to Ontario, returning Wed, Sep 23, priced at CA $679 found 1 day ago
Delta
Wed, Sep 9 - Wed, Sep 23
BWI
Baltimore
ONT
Ontario
CA $684 Roundtrip, found 1 day ago
CA $684
Roundtrip
found 1 day ago
Select Delta flight, departing Wed, Sep 9 from Baltimore to Ontario, returning Wed, Sep 23, priced at CA $684 found 1 day ago
American Airlines
Tue, Aug 25 - Tue, Sep 1
BWI
Baltimore
ONT
Ontario
CA $687 Roundtrip, found 23 hours ago
CA $687
Roundtrip
found 23 hours ago
Select American Airlines flight, departing Tue, Aug 25 from Baltimore to Ontario, returning Tue, Sep 1, priced at CA $687 found 23 hours ago
Alaska Airlines
Tue, Aug 25 - Tue, Sep 1
BWI
Baltimore
ONT
Ontario
CA $764 Roundtrip, found 23 hours ago
CA $764
Roundtrip
found 23 hours ago
Select Alaska Airlines flight, departing Tue, Aug 25 from Baltimore to Ontario, returning Tue, Sep 1, priced at CA $764 found 23 hours ago
United
Tue, Aug 25 - Tue, Sep 1
BWI
Baltimore
ONT
Ontario
CA $841 Roundtrip, found 23 hours ago
CA $841
Roundtrip
found 23 hours ago
Select United flight, departing Tue, Aug 25 from Baltimore to Ontario, returning Tue, Sep 1, priced at CA $841 found 23 hours ago

Alternative airports near Ontario

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Los Angeles - Ontario Intl. ONT. Cheapest and Closest option available. Average driving time to city centre is 8 minutes. Flights from CA $846
ONT
Los Angeles - Ontario Intl.
CheapestClosest
Average driving time to city centre8 min
Flights from CA $846

Frequently asked questions

How much does a flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT) cost?
You can find cheap one-way flights from CA $254 and cheap return flights from CA $580 BWI to ONT with Expedia. One-way flights typically cost between CA$384 and CA$1,173 and return flights often range between CA$626 and CA$2,006. 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 BWI to ONT ticket fares go up or down.
What is the cheapest month to fly from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
If you're looking for the cheapest time to fly from Baltimore Washington International Thurgood Marshall (BWI) to Ontario Intl. Airport (ONT), August is typically your best bet. You can expect average return fares to be around CA$565 during this month. August often sees lower prices as it falls outside of peak holiday travel seasons, making it a great time to find a deal. Other budget-friendly months for this route include February and September.
Which airlines fly direct from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
Only one airline offers direct flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT). Southwest Airlines operates 7 direct flights from Baltimore Washington Intl. Thurgood Marshall to Los Angeles - Ontario Intl. every week.
How do I find cheap flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
To find a cheap flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT), 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 and receive alerts when fares go up or down.
What is the best airline to fly with from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
The best airline to fly with from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT) will differ from traveler to traveler. If you like to fly early, Southwest Airlines offers early morning flights. If price is the most important factor, Southwest Airlines typically offers the lowest fares. Southwest Airlines offers the most daily flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT), 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 Baltimore, MD (BWI) to Ontario Intl. Airport (ONT)?
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 Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
There are approximately 78 connecting flights per day from Baltimore Washington Intl. Thurgood Marshall (BWI) to Ontario Intl. Airport (ONT). Some common connection points include Seattle - Tacoma Intl. (SEA), O'Hare Intl. (ORD), and Portland Intl. (PDX).
What is the earliest flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
The earliest flight from Baltimore Washington Intl. Thurgood Marshall (BWI) to Ontario Intl. Airport (ONT) typically departs around 5:00 AM local time. This flight is operated by American Airlines. This is a seasonal service, active only in December. 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 Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
You'll typically find the most flights from Baltimore Washington Intl. Thurgood Marshall (BWI) to Ontario Intl. Airport (ONT) on a Thursday, with around 50 flights available. This gives you a good selection of options for your travel plans. Major airlines on this route include Southwest Airlines, United, and Delta. Flight schedules are quite consistent throughout the week, so you'll have plenty of choices no matter which day you choose to fly.
What are the most popular departure times for flights from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
The most popular departure times for flights from Baltimore Washington Intl. Thurgood Marshall (BWI) to Ontario Intl. Airport (ONT) are in the morning, from 6am to 9am. Many major carriers, including Southwest Airlines, United and Delta, offer flights during this window. Many travelers prefer this because it allows for an early start to your travel day, getting you to your destination with plenty of time left.
How long does it take to fly from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
A non-stop flight from Baltimore Washington Intl. Thurgood Marshall (BWI) to Ontario Intl. Airport (ONT) typically takes around 5 hours 18 minutes. This route covers a distance of approximately 3664 kilometres. If you opt for a one-stop flight, your travel time will be longer, usually around 7 hours 48 minutes. Flights with two or more stops will extend your journey even further, averaging about 12 hours 30 minutes. Keep in mind that actual flight times can vary due to factors like wind patterns and air traffic.
Can you fly business or first class from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
Yes, you can fly business class or first class between BWI and ONT. You can fly business class with Frontier Airlines and Delta.First class cabins are available on Alaska Airlines, United, Delta, and American Airlines.
How do I earn miles on a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT) flight with Expedia?
It's easy to earn miles on a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT) 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™, 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 Ontario Intl. Airport (ONT) from Baltimore, MD (BWI)?
If you're planning to travel to Ontario from Baltimore Washington Intl. Thurgood Marshall (BWI), you can fly directly into Los Angeles - Ontario Intl. (ONT) which offers international flights and connections. Some flights may connect through major hubs like Seattle - Tacoma Intl. (SEA), O'Hare Intl. (ORD), or Denver Intl. (DEN) before reaching Ontario. 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 Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT) at the last minute?
Typically, booking a last minute flight from Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT) 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 Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT) flight and hotel package?
Securing a Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT) flight and hotel package 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 Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT)?
If you booked your Baltimore, MD (BWI-Baltimore Washington Intl. Thurgood Marshall) to Ontario Intl. Airport (ONT) 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 or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Baltimore Washington Intl. Thurgood Marshall
Destination airport
Ontario Intl. Airport
Airlines serving
Alaska Airlines, American Airlines, Delta, United
Roundtrip price
CA $580
Distance
3643 km
Average flight time
6 hours 50 mins

Book with confidence

Baltimore to Los Angeles Flights

The easy way to book your flights from Baltimore to Ontario Intl. Airport 

With Expedia, it’s simple to find and book flights to Ontario Intl. Airport from Baltimore whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Ontario Intl. Airport, 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 Baltimore to Ontario Intl. Airport today, tomorrow, or this week.  

 

Save dollars with cheap flights from Baltimore Washington Intl. Thurgood Marshall, BWI to Ontario Intl. Airport, ONT 

Sort your search results by price to find great deals on your flight from Baltimore to Ontario Intl. Airport—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to Ontario Intl. Airport from Baltimore currently is just CA $580 rising to CA $841.  

Here are more money-saving tips: 

  • Fly in September when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to Ontario Intl. Airport  
  • 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 Ontario Intl. Airport from Baltimore 

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 Ontario Intl. Airport with Expedia today.

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