Title: CA $97 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 $97 Cheap Alaska Airlines fights from Seattle (SEA) to Ontario (ONT) [View CA $97 flight on Tue, Feb 24, 2026](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:SEA,to:ONT,departure:24/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:96.60&airProductToken=AQowCi4IwaYBEgM1OTIYkgEgrpsBKLWJhgMw1IqGAzhYQABYAWoCU1ZyCEdIMk9BVkJOEgoIARABGAEqAkFTGAEiBAgBEAEoAigDKAQwAQ) - [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 - ![](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\* - ![](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\* - ![](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 $97 for one-way flights and CA $179 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) Mon, Mar 16 - Wed, Mar 25 SEA Seattle ONT Ontario CA $179 Roundtrip found 6 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:16/03/2026TANYT&leg2=from:ONT,to:SEA,departure:25/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:178.10&airProductToken=AQowCi4IwaYBEgM1OTIYkgEgrpsBKKzqhwMwyOuHAzhYQABYAWoCU1ZyCE9IMkVBVkJOCjAKLgjBpgESAzYwNxiumwEgkgEozMiIAzD6yYgDOFhAAFgBagJTVnIIR0gyRUFWQk4SCggBEAEYASoCQVMYASIECAEQASgCKAMoBDAB) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Mon, Apr 13 - Thu, Apr 23 SEA Seattle ONT Ontario CA $186 Roundtrip found 6 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:13/04/2026TANYT&leg2=from:ONT,to:SEA,departure:23/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:185.60&airProductToken=AQoiCiAIwaYBEgM0ODkYkgEgrpsBKMiligMw46aKAzhYQABYAQoiCiAIwaYBEgM3MjkYrpsBIJIBKKKTiwMwzZSLAzhYQABYARIKCAEQARgBKgJBUxgBIgQIARABKAQwAQ) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Wed, Mar 11 - Tue, Mar 17 SEA Seattle ONT Ontario CA $216 Roundtrip found 1 day ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:11/03/2026TANYT&leg2=from:ONT,to:SEA,departure:17/03/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:215.50&airProductToken=AQoxCi8IwaYBEgQxMzY0GJIBIK6bASiirIcDMMCthwM4WEAAWAFqAlNWcghPSDJFWFZCTgowCi4IwaYBEgM2MDcYrpsBIJIBKNruhwMwifCHAzhYQABYAWoCU1ZyCE9IMkVYVkJOEgoIARABGAEqAkFTGAEiBAgBEAEoAigDKAQwAQ) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Wed, Feb 25 - Sat, Feb 28 SEA Seattle ONT Ontario CA $217 Roundtrip found 2 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:25/02/2026TANYT&leg2=from:ONT,to:SEA,departure:28/02/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:216.60&airProductToken=AQoxCi8IwaYBEgQxMzY0GJIBIK6bASiej4YDMLyQhgM4WEAAWAFqAlNWcghPSDJFWFVCTgowCi4IwaYBEgM2NTQYrpsBIJIBKNKyhgMw_LOGAzhYQABYAWoCU1ZyCE9IMkVYVUJOEgoIARABGAEqAkFTGAEiBAgBEAEoAigDKAQwAQ) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Wed, Apr 1 - Thu, Apr 30 SEA Seattle ONT Ontario CA $226 Roundtrip found 6 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:01/04/2026TANYT&leg2=from:ONT,to:SEA,departure:30/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:225.40&airProductToken=AQowCi4IwaYBEgM0ODkYkgEgrpsBKMieiQMw45-JAzhYQABYAWoCU1ZyCE9IMkVYVkJOCjAKLgjBpgESAzYwNxiumwEgkgEozN2LAzD23osDOFhAAFgBagJTVnIIT0gyRUFWQk4SCggBEAEYASoCQVMYASIECAEQASgCKAMoBDAB) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Mon, Apr 13 - Tue, Apr 14 SEA Seattle ONT Ontario CA $226 Roundtrip found 6 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:13/04/2026TANYT&leg2=from:ONT,to:SEA,departure:14/04/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:226.00&airProductToken=AQpECh8IwaYBEgM0MjkYkgEgwUMo06GKAzCpoooDOFhAAFgBCiEIwaYBEgQyMzM5GMFDIK6bASjwoooDMO2jigM4WEABWAEKIgogCMGmARIDNjA3GK6bASCSASjMqYoDMPqqigM4WEAAWAESCggBEAEYASoCQVMYASIECAEQASgEMAE) ## Find the cheapest month to fly from Seattle (SEA) to Ontario (ONT) ### October is typically the cheapest month to fly From CA $111 - CA $225 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:12/02/2026TANYT&leg2=from:SNA,to:SEA,departure:24/02/2026TANYT&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 $550 ](https://www.expedia.ca/Flights-Search?leg1=from:SEA,to:SNA,departure:12/02/2026TANYT&leg2=from:SNA,to:SEA,departure:24/02/2026TANYT&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 39 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.