Cheap Flights From Seattle - Tacoma Intl. (SEA) To Los Angeles - Ontario Intl. (ONT)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

Find The Best Dates To Fly

Cheapest Flights from Seattle (SEA) to Ontario (ONT)

The cheapest flights to Los Angeles - Ontario Intl. found within the past 7 days were CA $253 round trip and CA $126 one way. Prices and availability subject to change. Additional terms may apply.

Sat, Dec 6 - Sat, Dec 13
SEA
Seattle
ONT
Ontario
CA $253 Roundtrip, found 1 day ago
CA $253
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Sat, Dec 6 from Seattle to Ontario, returning Sat, Dec 13, priced at CA $253 found 1 day ago
Thu, Nov 13 - Mon, Nov 17
SEA
Seattle
ONT
Ontario
CA $255 Roundtrip, found 3 days ago
CA $255
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, Nov 13 from Seattle to Ontario, returning Mon, Nov 17, priced at CA $255 found 3 days ago
Fri, Nov 14 - Sun, Nov 16
SEA
Seattle
ONT
Ontario
CA $280 Roundtrip, found 17 hours ago
CA $280
Roundtrip
found 17 hours ago
Select Alaska Airlines flight, departing Fri, Nov 14 from Seattle to Ontario, returning Sun, Nov 16, priced at CA $280 found 17 hours ago
Fri, Jan 2 - Mon, Jan 5
SEA
Seattle
ONT
Ontario
CA $291 Roundtrip, found 3 days ago
CA $291
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Fri, Jan 2 from Seattle to Ontario, returning Mon, Jan 5, priced at CA $291 found 3 days ago
Fri, Nov 14 - Sun, Nov 16
SEA
Seattle
ONT
Ontario
CA $295 Roundtrip, found 17 hours ago
CA $295
Roundtrip
found 17 hours ago
Select Alaska Airlines flight, departing Fri, Nov 14 from Seattle to Ontario, returning Sun, Nov 16, priced at CA $295 found 17 hours ago
Sat, Nov 15 - Sun, Nov 16
SEA
Seattle
ONT
Ontario
CA $296 Roundtrip, found 4 days ago
CA $296
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Sat, Nov 15 from Seattle to Ontario, returning Sun, Nov 16, priced at CA $296 found 4 days ago
Thu, Nov 13 - Mon, Nov 17
SEA
Seattle
ONT
Ontario
CA $297 Roundtrip, found 3 days ago
CA $297
Roundtrip
found 3 days ago
Select Alaska Airlines flight, departing Thu, Nov 13 from Seattle to Ontario, returning Mon, Nov 17, priced at CA $297 found 3 days ago
Thu, Dec 18 - Tue, Dec 23
SEA
Seattle
ONT
Ontario
CA $310 Roundtrip, found 3 days ago
CA $310
Roundtrip
found 3 days ago
Select Hawaiian Airlines flight, departing Thu, Dec 18 from Seattle to Ontario, returning Tue, Dec 23, priced at CA $310 found 3 days ago
Fri, Nov 14 - Sun, Nov 16
SEA
Seattle
ONT
Ontario
CA $314 Roundtrip, found 17 hours ago
CA $314
Roundtrip
found 17 hours ago
Select Alaska Airlines flight, departing Fri, Nov 14 from Seattle to Ontario, returning Sun, Nov 16, priced at CA $314 found 17 hours ago
Sat, Nov 15 - Sun, Nov 16
SEA
Seattle
ONT
Ontario
CA $323 Roundtrip, found 5 days ago
CA $323
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sat, Nov 15 from Seattle to Ontario, returning Sun, Nov 16, priced at CA $323 found 5 days ago

Frequently asked questions

Are there direct flights from Sea-Tac Airport to Ontario Airport?
If you'd love to travel from Seattle - Tacoma Intl. Airport (SEA) to Los Angeles - Ontario Intl. Airport (ONT) as quickly as possible, you'll be happy to know multiple airlines operate direct flights. Choose your favorite seat with Alaska Airlines or Delta.
What airlines fly from Sea-Tac Airport to Los Angeles - Ontario Intl. Airport (ONT)?
If you're planning a trip to Ontario from Seattle, there are a few airlines offering direct flights. One of the top carriers is Alaska Airlines (AS), which operates 108 flights every month. You'll want to also check out the deals available through Delta (DL). Another popular airline, it operates 91 flights every month on the Seattle to Ontario route. Be sure to compare the two airlines to find your perfect fare.
What is the best day to buy a plane ticket?
Airfares offered on Friday tend to be the cheapest, according to flight demand on Travelocity.ca in 2021. Purchasing your airfares on a Thursday or Saturday can also provide better value, however our advice if you're looking to save money is to avoid booking on a Wednesday or Sunday. Our data shows that those two days have the highest ticket values on average, so keep this in mind if you're browsing flight deals.
What are the cheapest days to fly?
Frequent travellers may already know this, but earlier in the week is often the cheapest time to fly. Flights departing on a Monday are the cheapest of the week. Since flights towards the middle of the week tend to be more popular, this causes the prices to rise. This is why, on average, airfares booked on Travelocity.ca in 2021 were most expensive for Wednesday departures.
How far in advance can you book a flight?
Here's the deal: It is typically possible to start comparing international airfares on Travelocity.ca up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2-4 weeks prior to their travel dates.*According to flight demand on Travelocity.ca from January to December 2021. Savings are subject to change and may vary depending on selections made.

Popular Flight Routes from Seattle (SEA)

Travelers at SEA love to visit these top cities. Roam to the top destinations from Seattle (SEA) today with the cheap prices from Travelocity!

Popular Flight Routes from Ontario (ONT)

Travelers at ONT love to visit these top cities. Roam to the top destinations from Ontario(ONT) today with the cheap prices from Travelocity!

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.