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

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

The cheapest flights to Los Angeles - Ontario Intl. found within the past 7 days were CA $258 round trip and CA $124 one way. Prices and availability subject to change. Additional terms may apply.

Thu., Aug. 14 - Wed., Aug. 20
SEA
Seattle
ONT
Ontario
CA $258 Roundtrip, found 2 days ago
CA $258
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu., Aug. 14 from Seattle to Ontario, returning Wed., Aug. 20, priced at CA $258 found 2 days ago
Fri., Aug. 15 - Tue., Aug. 26
SEA
Seattle
ONT
Ontario
CA $258 Roundtrip, found 2 days ago
CA $258
Roundtrip
found 2 days ago
Select Delta flight, departing Fri., Aug. 15 from Seattle to Ontario, returning Tue., Aug. 26, priced at CA $258 found 2 days ago
Sat., Aug. 16 - Sun., Aug. 17
SEA
Seattle
ONT
Ontario
CA $261 Roundtrip, just found
CA $261
Roundtrip
just found
Select Alaska Airlines flight, departing Sat., Aug. 16 from Seattle to Ontario, returning Sun., Aug. 17, priced at CA $261 just found
Fri., Sep. 26 - Sun., Sep. 28
SEA
Seattle
ONT
Ontario
CA $268 Roundtrip, found 2 days ago
CA $268
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri., Sep. 26 from Seattle to Ontario, returning Sun., Sep. 28, priced at CA $268 found 2 days ago
Thu., Sep. 18 - Fri., Sep. 19
SEA
Seattle
ONT
Ontario
CA $269 Roundtrip, found 6 days ago
CA $269
Roundtrip
found 6 days ago
Select Alaska Airlines flight, departing Thu., Sep. 18 from Seattle to Ontario, returning Fri., Sep. 19, priced at CA $269 found 6 days ago
Fri., Aug. 15 - Tue., Aug. 26
SEA
Seattle
ONT
Ontario
CA $273 Roundtrip, found 2 days ago
CA $273
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri., Aug. 15 from Seattle to Ontario, returning Tue., Aug. 26, priced at CA $273 found 2 days ago
Fri., Sep. 26 - Sun., Sep. 28
SEA
Seattle
ONT
Ontario
CA $282 Roundtrip, found 2 days ago
CA $282
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri., Sep. 26 from Seattle to Ontario, returning Sun., Sep. 28, priced at CA $282 found 2 days ago
Thu., Aug. 14 - Wed., Aug. 20
SEA
Seattle
ONT
Ontario
CA $285 Roundtrip, found 2 days ago
CA $285
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Thu., Aug. 14 from Seattle to Ontario, returning Wed., Aug. 20, priced at CA $285 found 2 days ago
Thu., Aug. 14 - Mon., Aug. 18
SEA
Seattle
ONT
Ontario
CA $286 Roundtrip, found 4 days ago
CA $286
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu., Aug. 14 from Seattle to Ontario, returning Mon., Aug. 18, priced at CA $286 found 4 days ago
Fri., Sep. 26 - Sun., Sep. 28
SEA
Seattle
ONT
Ontario
CA $295 Roundtrip, found 2 days ago
CA $295
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Fri., Sep. 26 from Seattle to Ontario, returning Sun., Sep. 28, priced at CA $295 found 2 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.