Title: CA $96 Cheap Alaska Airlines fights from Seattle to Ontario - Expedia.ca ![Ontario showing night scenes and street scenes](https://images.trvl-media.com/place/2680/6f6cbfd1-6188-4a75-9ba7-05d8edf0fb1d.jpg?impolicy=fcrop&w=1200&h=500&q=medium) Photo by Ontario Convention & Visitors Bureau / Jon Edwards. ![](https://images.trvl-media.com/place/2680/6f6cbfd1-6188-4a75-9ba7-05d8edf0fb1d.jpg?impolicy=fcrop&w=1200&h=500&q=medium) # CA $96 Cheap Alaska Airlines fights from Seattle (SEA) to Ontario (ONT) [View CA $96 flight on Sat, Jan 24, 2026](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:SEA,to:ONT,departure:24/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:95.30&airProductToken=AQowCi4IwaYBEgM2NjQYkgEgrpsBKI-pgwMwrKqDAzhYQABYAWoCU1ZyCEdIMk9BVkJOEgoIARABGAEqAkFTGAEiBAgBEAEoAigDKAQwAQ) - [Roundtrip](?flightType=roundtrip) - [One-way](?flightType=oneway) - [Multi-city](?flightType=multicity) ### Travellers Adults ChildrenAges 2 to 17 InfantsYounger than 2 EconomyPremium economyBusiness classFirst class Leaving from Going to Departing Returning Add a place to stay Add a car Direct flights only - ![notification illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__notification.svg) ### Be in the know Get alerts if flight prices drop or rise\* - ![deals illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__deals.svg) ### Book smarter Save up to 30% on select hotels after you book a flight\* - ![trophy illustration](https://a.travel-assets.com/travel-assets-manager/pictogram-bex/light__trophy.svg) ### Earn twice Earn your airline miles on top of our rewards [Sign in](https://www.expedia.ca/login) ## Alaska Airlines flights from Seattle to Ontario (SEA→ONT) Prices were available within the past 7 days and start at CA $96 for one-way flights and CA $136 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals One way Roundtrip ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Sat, Jan 24 - Mon, Jan 26 SEA Seattle ONT Ontario CA $136 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:24/01/2026TANYT&leg2=from:ONT,to:SEA,departure:26/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:135.70&airProductToken=AQowCi4IwaYBEgM2NjQYkgEgrpsBKI-pgwMwrKqDAzhYQABYAWoCU1ZyCEdIMkVBVkJOCjAKLgjBpgESAzYwNxiumwEgkgEoyLyDAzD2vYMDOFhAAFgBagJTVnIIR0gyRUFWQk4SCggBEAEYASoCQVMYASIECAEQASgCKAMoBDAB) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Sat, Jan 24 - Mon, Jan 26 SEA Seattle ONT Ontario CA $178 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:24/01/2026TANYT&leg2=from:ONT,to:SEA,departure:26/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:177.70&airProductToken=AQowCi4IwaYBEgM2NjQYkgEgrpsBKI-pgwMwrKqDAzhYQABYAWoCU1ZyCEdIMkVBVkJOCjAKLgjBpgESAzY2NRiumwEgkgEoo8GDAzDOwoMDOFhAAFgBagJTVnIIT0gyRUFWQk4SCggBEAEYASoCQVMYASIECAEQASgCKAMoBDAB) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Tue, Mar 17 - Tue, Mar 24 SEA Seattle ONT Ontario CA $190 Roundtrip found 18 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:17/03/2026TANYT&leg2=from:ONT,to:SEA,departure:24/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:189.50&airProductToken=AQoxCi8IwaYBEgQxMzY0GJIBIK6bASji74cDMIDxhwM4WEAAWAFqAlNWcghPSDJFWFVCTgowCi4IwaYBEgM2MDcYrpsBIJIBKKy9iAMw1r6IAzhYQABYAWoCU1ZyCEdIMkVBVkJOEgoIARABGAEqAkFTGAEiBAgBEAEoAigDKAQwAQ) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Thu, Jan 29 - Sat, Feb 7 SEA Seattle ONT Ontario CA $195 Roundtrip found 4 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:29/01/2026TANYT&leg2=from:ONT,to:SEA,departure:07/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:194.40&airProductToken=AQowCi4IwaYBEgM0ODkYkgEgrpsBKMDlgwMw3OaDAzhYQABYAWoCU1ZyCEdIMk9BVkJOEgoIARABGAEqAkFTGAEiBAgBEAEoAigDKAQwAQ) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Sun, Jan 4 - Sun, Jan 11 SEA Seattle ONT Ontario CA $204 Roundtrip found 6 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:04/01/2026TANYT&leg2=from:ONT,to:SEA,departure:11/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:203.50&airProductToken=AQowCi4IwaYBEgM0ODkYkgEgrpsBKK_MgQMwzs2BAzhYQABYAWoCU1ZyCE9IMkVBVkJOCjAKLgjBpgESAzYwNxiumwEgkgEo6JOCAzCWlYIDOFhAAFgBagJTVnIIR0gyRUFWQk4SCggBEAEYASoCQVMYASIECAEQASgCKAMoBDAB) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Sat, Jan 24 - Mon, Jan 26 SEA Seattle ONT Ontario CA $205 Roundtrip found 5 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:24/01/2026TANYT&leg2=from:ONT,to:SEA,departure:26/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:205.00&airProductToken=AQowCi4IwaYBEgM1OTIYkgEgrpsBKNirgwMw9KyDAzhYQABYAWoCU1ZyCEdIMk9BVkJOCmIKLwjBpgESAzM0MRiumwEg77gBKJfCgwMwqsODAzhYQABYAWoCU1ZyCEdIMk9BSkJOCi8IwaYBEgQzMDQxGO-4ASCSASjqw4MDMKnEgwM4WEABWAFqAlNWcghHSDJPQUpCThIKCAEQARgBKgJBUxgBIgQIARABKAIoAygEMAE) ## Find the cheapest month to fly from Seattle (SEA) to Ontario (ONT) ### October is typically the cheapest month to fly From CA $111 - CA $224 per traveller. ## Alternative airports near Ontario Prices were available within the past 7 days. Prices and availability are subject to change. [](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:SNA,departure:30/12/2025TANYT&leg2=from:SNA,to:SEA,departure:09/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) SNA John Wayne 42 min [Flights from CA $438 ](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:SNA,departure:30/12/2025TANYT&leg2=from:SNA,to:SEA,departure:09/01/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) __Flight from Seattle to Ontario (SEA - ONT) route information__ | Origin airport | Seattle - Tacoma Intl. | | ------------------- | -------------------------------------------------------------------- | | Destination airport | Los Angeles - Ontario Intl. | | Airlines serving | Alaska Airlines, American Airlines, Delta, Hawaiian Airlines, United | | Popular airline | Alaska Airlines | | Distance | 1530 km | | Average flight time | 2 hours 40 mins | ## Frequently asked questions ### How much is an Alaska Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)? ### What is the cheapest month to fly from SEA to ONT with Alaska Airlines? ### Does Alaska Airlines fly nonstop from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)? ### How long does it take to fly from SEA to ONT with Alaska Airlines? ### Which day of the week has the most Alaska Airlines flights from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)? ### What airports does Alaska Airlines fly into in Ontario? ### What type of plane does Alaska Airlines fly from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)? ### Can I change or cancel my Alaska Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)? \*Available to Expedia members.