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Cheap First Class Flights from Ontario to Seattle

ONT — SEA
Aug 19 — Aug 261
Wed 8/19
Wed 8/26
1 adult, First
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Essential info for First Class flights from Ontario to Seattle

Find the latest flights to Seattle in 2026, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 2,558,603 searches and data were last updated on July 20, 2026.

Top Rated Airline

American Airlines

No. of Airlines

5

Arrival Airport

Seattle/Tacoma Intl Airport
Most popular airline to fly first class with to Seattle in the past 7 days
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Airlines that offer first class options for this route
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Closest airport for this route
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Find First Class flight deals from Ontario to Seattle

Cheapest first class flights to Seattle
Explore the most affordable first class flight options available to Seattle. Find the lowest fares based on data from user searches, with prices last updated on July 20, 2026.

This Delta deal was found by Cheapflights users on 7/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/111:56 am
ONT
-
SEA
Nonstop2h 54m
Delta
Tue 9/158:20 am
SEA
-
ONT
Nonstop2h 54m
Delta
Deal found 7/17$517
This Alaska Airlines deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/13:07 pm
ONT
-
SEA
Nonstop2h 42m
Alaska Airlines
Tue 9/1511:29 am
SEA
-
ONT
Nonstop2h 47m
Alaska Airlines
Deal found 7/20$537
This Alaska Airlines deal was found by Cheapflights users on 7/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/197:59 pm
ONT
-
SEA
Nonstop2h 42m
Alaska Airlines
Thu 8/278:43 pm
SEA
-
ONT
Nonstop2h 41m
Alaska Airlines
Deal found 7/15$567
This Delta deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/181:06 pm
ONT
-
SEA
1 stop5h 38m
Delta
Tue 8/257:50 pm
SEA
-
ONT
Nonstop2h 55m
Delta
Deal found 7/16$612
This Expedia deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/207:59 pm
ONT
-
SEA
Nonstop2h 42m
Alaska Airlines
Wed 9/237:15 am
SEA
-
ONT
1 stop8h 55m
Alaska Airlines
Deal found 7/18$627
This Alaska Airlines deal was found by Cheapflights users on 7/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/156:56 pm
ONT
-
SEA
Nonstop2h 45m
Alaska Airlines
Sun 10/183:59 pm
SEA
-
ONT
1 stop7h 54m
Alaska Airlines
Deal found 7/16$637

Travel insights for first class flights from Ontario to Seattle

Get recent, data-driven insights about first class flights from Ontario to Seattle including ideal travel times, pricing trends, and more.

Which month is the cheapest to fly First Class from Ontario to Seattle?

For First Class flights the cheapest month to fly the route is December. The most expensive months are November and October.

Frequently Asked Questions about Ontario to Seattle First Class flights

Find answers to common questions related to First Class tickets for flights to Seattle. Get information on booking, amenities, upgrade options, and more. This FAQ section was last updated on July 20, 2026.

  • What's cheaper, flying business or first class?

    First class flights are more often than not more expensive than business class and that holds true for this route, where business class tickets cost $728 on average and first class tickets $1,118.

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