Title: CA $152 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 $152 Cheap Alaska Airlines fights from Seattle (SEA) to Ontario (ONT) [View CA $152 flight on Sat, Jan 3, 2026](https://expedia.ca/Flights-Search?trip=oneway&leg1=from:SEA,to:ONT,departure:03/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:151.50&airProductToken=AQowCi4IwaYBEgM0ODkYkgEgrpsBKI_BgQMwrsKBAzhYQABYAWoCU1ZyCE9IMk9YVUJOEgoIARABGAEqAkFTGAEiBAgBEAEoAigDKAQwAQ) - [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 $152 for one-way flights and CA $248 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, Dec 6 - Sat, Dec 13 SEA Seattle ONT Ontario CA $248 Roundtrip found 2 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:06/12/2025TANYT&leg2=from:ONT,to:SEA,departure:13/12/2025TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:247.10&airProductToken=AQowCi4IwaYBEgM1OTIYkgEgrpsBKL2D_wIw2YT_AjhYQABYAWoCU1ZyCE9IMkVYVkJOCjAKLgjBpgESAzYwNxiumwEgkgEoyM3_AjD5zv8COFhAAFgBagJTVnIIT0gyRVhWQk4SCggBEAEYASoCQVMYASIECAEQASgCKAMoBDAB) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Wed, Jan 7 - Sat, Jan 10 SEA Seattle ONT Ontario CA $275 Roundtrip found 2 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:07/01/2026TANYT&leg2=from:ONT,to:SEA,departure:10/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:274.30&airProductToken=AQpiCi8IwaYBEgQzMDQyGJIBIO-4ASiC6oEDMLzqgQM4WEAAWAFqAlNWcghHSDJPWEpCTgovCMGmARIDNTY1GO-4ASCumwEo8-qBAzCB7IEDOFhAAVgBagJTVnIIR0gyT1hKQk4KYgovCMGmARIDNTQ0GK6bASDvuAEohImCAzCdioIDOFhAAFgBagJTVnIIR0gyT1hKQk4KLwjBpgESBDMwNDUY77gBIJIBKNaKggMwlYuCAzhYQAFYAWoCU1ZyCEdIMk9YSkJOEgoIARABGAEqAkFTGAEiBAgBEAEoAigDKAQwAQ) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Thu, Jan 15 - Sat, Jan 31 SEA Seattle ONT Ontario CA $289 Roundtrip found 2 days ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:15/01/2026TANYT&leg2=from:ONT,to:SEA,departure:31/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:288.20&airProductToken=AQpECh8IwaYBEgMyMzMYkgEgwUMo-8OCAzDSxIIDOFhAAFgBCiEIwaYBEgQyMzM5GMFDIK6bASiFxoIDMITHggM4WEABWAEKRgohCMGmARIDMzQxGK6bASDvuAEot_qDAzDK-4MDOFhAAFgBCiEIwaYBEgQyMDY2GO-4ASCSASiK_IMDMMT8gwM4WEABWAESCggBEAEYASoCQVMYASIECAEQASgEMAE) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Sat, Jan 3 - Wed, Jan 14 SEA Seattle ONT Ontario CA $289 Roundtrip found 3 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:03/01/2026TANYT&leg2=from:ONT,to:SEA,departure:14/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:288.60&airProductToken=AQowCi4IwaYBEgM0ODkYkgEgrpsBKI_BgQMwrsKBAzhYQABYAWoCU1ZyCE9IMk9YVUJOCmMKMAjBpgESBDMwNjQYrpsBIO-4ASiauYIDMLS6ggM4WEAAWAFqAlNWcghHSDJPWEpCTgovCMGmARIEMTMxOBjvuAEgkgEo_7qCAzDDu4IDOFhAAVgBagJTVnIIR0gyT1hKQk4SCggBEAEYASoCQVMYASIECAEQASgCKAMoBDAB) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Fri, Jan 2 - Tue, Jan 13 SEA Seattle ONT Ontario CA $303 Roundtrip found 3 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:02/01/2026TANYT&leg2=from:ONT,to:SEA,departure:13/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:302.60&airProductToken=AQowCi4IwaYBEgM0ODkYkgEgrpsBKO-1gQMwjreBAzhYQABYAWoCU1ZyCE9IMk9BVkJOCmIKLwjBpgESAzM0MRiumwEg77gBKPevggMwirGCAzhYQABYAWoCU1ZyCEdIMk9YSkJOCi8IwaYBEgQzMDQxGO-4ASCSASjKsYIDMImyggM4WEABWAFqAlNWcghHSDJPWEpCThIKCAEQARgBKgJBUxgBIgQIARABKAIoAygEMAE) ![Alaska Airlines](//images.trvl-media.com/media/content/expus/graphics/static_content/fusion/v0.1b/images/airlines/AS.gif) Sat, Jan 3 - Wed, Jan 14 SEA Seattle ONT Ontario CA $307 Roundtrip found 3 hours ago [](https://expedia.ca/Flights-Search?trip=roundtrip&leg1=from:SEA,to:ONT,departure:03/01/2026TANYT&leg2=from:ONT,to:SEA,departure:14/01/2026TANYT&passengers=children:0,adults:1,seniors:0,infantinlap:N&mode=search&options=sortby:price&paandi=true&flp=mdl:flights-flex-module,price:306.90&airProductToken=AQowCi4IwaYBEgM0ODkYkgEgrpsBKI_BgQMwrsKBAzhYQABYAWoCU1ZyCE9IMkVYVkJOCmAKLwjBpgESBDIzNDAYrpsBIMFDKIy8ggMwhb2CAzhYQABYAWoCU1ZyCEdIMkVYVUJOCi0IwaYBEgMzNDUYwUMgkgEow8CCAzCzwYIDOFhAAVgBagJTVnIIUUgyRUFVQk4SCggBEAEYASoCQVMYASIECAEQASgCKAMoBDAB) 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 42 mins | ## Frequently asked questions ### How much is an Alaska Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)? > Set the "Price (lowest to highest)" filter on Expedia to find cheap Alaska Airlines round-trip flights from CA $248 from SEA to ONT. Affordable one-way tickets from CA $152 are available too.\**\*These prices were available on Expedia within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.* ### What is the cheapest month to fly from SEA to ONT with Alaska Airlines? > Alaska Airlines flights to Ontario are generally more affordable in the off-peak months of January and April. Whether you need a return or one-way ticket, you could score a better deal then. ### Does Alaska Airlines fly nonstop from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)? > Take off on one of Alaska Airlines's 22 direct weekly flights from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT). To see your choices, enter your travel dates, origin and destination and hit search. Then select the "Nonstop" and "Airline" filters. ### How long does it take to fly from SEA to ONT with Alaska Airlines? > Take off from Seattle - Tacoma Intl. Airport (SEA) for Los Angeles - Ontario Intl. Airport (ONT) on a direct Alaska Airlines flight, and you'll be in the air for approximately 2h 34m. ### Which day of the week has the most Alaska Airlines flights from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)? > Thursday has the most Alaska Airlines flights from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT). With 4 daily departures, this is the best day to book something that will suit your schedule. ### What airports does Alaska Airlines fly into in Ontario? > When flying from Seattle - Tacoma Intl. Airport (SEA) to Ontario with Alaska Airlines, you'll most likely land at Los Angeles - Ontario Intl. Airport (ONT). This is the airline's main gateway to the city. Other nearby airports such as Los Angeles Intl. Airport (LAX) and John Wayne Airport (SNA) may have more affordable flights, so it's smart to explore all available options on Expedia. ### What type of plane does Alaska Airlines fly from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)? > For the Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT) route, Alaska Airlines typically operates Boeing 737-800 and Boeing 737 MAX 9 planes. Don't forget that last-minute changes can occur for operational needs, so your flight may be on another aircraft. ### Can I change or cancel my Alaska Airlines flight from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT)? > Depending on the type of fare you purchased, a fee may apply if you change or cancel your booking more than 24 hours after it's confirmed. To find plane tickets with more flexibility, select our "Changes included" and "No cancel fee" boxes when you search for flights. For more details on modifying or cancelling your reservation, go to "[Trips](https://www.expedia.ca/trips)," select your flight and tick "Manage Booking." ## Explore a world of travel with Expedia \*Available to Expedia members.