CA $189 Cheap Flights from Ontario Intl. Airport (ONT) to Seattle (SEA)

You can find cheap one-way flights from CA $189 and cheap return flights CA $350 ONT to SEA with Expedia. One-way flights typically cost between CA$164 and CA$796, and return flights often range between CA$669 and CA$1591. 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 SEA ticket fares go up or down.

If you're looking for the cheapest time to fly from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.), February is typically your best bet. You can expect average return fares around CA$343 during this month. February often sees lower prices because it falls outside of peak holiday travel, when demand tends to drop. Other budget-friendly months to consider for this route include March and September.

There are 4 airlines offering direct flights from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.). Here are some of the top carriers:
* Delta operates 27 direct flights from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.
* Frontier Airlines operates 7 direct flights from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.
* Japan Airlines operates 7 direct flights from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.
* Qatar Airways operates 7 direct flights from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.) every week.

To find a cheap flight from Ontario Intl. Airport (ONT) to Seattle, WA (SEA), 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.

The best airline to fly with from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.) will differ from traveler to traveler. If you like to fly early, Alaska 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 Seattle, WA (SEA-Seattle - Tacoma 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.

The best time to fly from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.) is typically February or September. These months offer a great balance, with return flights averaging around CA$343.

You'll find around 5 nonstop flights per day from Ontario Intl. Airport (ONT) to Seattle - Tacoma Intl. (SEA). For even more choices, look at flights that include layovers, as there are approximately 72 connecting flights per day. Some common connection points include San Francisco Intl. (SFO), Portland Intl. (PDX), and Sky Harbor Intl. (PHX).

The earliest flight from Ontario Intl. Airport (ONT) to Seattle - Tacoma Intl. (SEA) typically departs around 12:55 AM local time, operated by American Airlines. This is a seasonal service active in 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.

You'll typically find the most flights from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.) on a Friday, with around 58 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, Alaska Airlines, and Delta. Friday offers notably more flight options compared to other days of the week, so you have a good selection to choose from.

The most popular departure times for flights from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.) are in the morning, from 6am to 9am. Many major carriers, including Alaska Airlines, Southwest Airlines and Delta, offer flights during this window. Many travellers prefer these early morning flights as they allow you to arrive at your destination with plenty of time to start your day.

When flying from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.), you have a few options. A nonstop flight typically takes around 3 hours, covering a distance of approximately 1540 kilometres. If you opt for a one-stop flight, your travel time will be longer, usually around 8 hours 30 minutes. Flights with two or more stops generally take even longer, averaging about 12 hours. 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.

You can fly business class or first class between ONT and SEA. You can fly business class with Frontier Airlines and Delta.

First class cabins are available on Alaska Airlines, Delta, United, and American Airlines.

It's easy to earn miles on a Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma 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™, 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.

If you're planning to travel to Seattle from Los Angeles - Ontario Intl. (ONT), you can fly directly into Seattle - Tacoma Intl. (SEA). Some flights may connect through major hubs like San Francisco Intl. (SFO), Seattle - Tacoma Intl. (SEA), or Portland Intl. (PDX) before reaching Seattle. Compare routes and airports on Expedia to find the best flight options for your travel plans.

Typically, booking a last minute flight from Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma 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.

Securing a Ontario Intl. Airport (ONT) to Seattle, WA (SEA-Seattle - Tacoma Intl.) 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.

If you booked your Ontario Intl. Airport (ONT) to Seattle, WA (SEA) 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.