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 $141 round trip and CA $123 one way. Prices and availability subject to change. Additional terms may apply.

Wed, Mar 18 - Tue, Mar 24
SEA
Seattle
ONT
Ontario
CA $141 Roundtrip, found 4 hours ago
CA $141
Roundtrip
found 4 hours ago
Select Delta flight, departing Wed, Mar 18 from Seattle to Ontario, returning Tue, Mar 24, priced at CA $141 found 4 hours ago
Wed, Apr 1 - Tue, Apr 21
SEA
Seattle
ONT
Ontario
CA $218 Roundtrip, found 5 days ago
CA $218
Roundtrip
found 5 days ago
Select Hawaiian Airlines flight, departing Wed, Apr 1 from Seattle to Ontario, returning Tue, Apr 21, priced at CA $218 found 5 days ago
Wed, Apr 15 - Sat, May 2
SEA
Seattle
ONT
Ontario
CA $218 Roundtrip, found 5 days ago
CA $218
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, Apr 15 from Seattle to Ontario, returning Sat, May 2, priced at CA $218 found 5 days ago
Wed, Apr 29 - Sat, May 16
SEA
Seattle
ONT
Ontario
CA $219 Roundtrip, found 5 days ago
CA $219
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Wed, Apr 29 from Seattle to Ontario, returning Sat, May 16, priced at CA $219 found 5 days ago
Sat, Feb 21 - Sat, Feb 28
SEA
Seattle
ONT
Ontario
CA $221 Roundtrip, found 5 days ago
CA $221
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sat, Feb 21 from Seattle to Ontario, returning Sat, Feb 28, priced at CA $221 found 5 days ago
Sat, Feb 21 - Sat, Feb 28
SEA
Seattle
ONT
Ontario
CA $224 Roundtrip, found 5 days ago
CA $224
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Sat, Feb 21 from Seattle to Ontario, returning Sat, Feb 28, priced at CA $224 found 5 days ago
Sat, Feb 7 - Sun, Feb 8
SEA
Seattle
ONT
Ontario
CA $225 Roundtrip, found 2 days ago
CA $225
Roundtrip
found 2 days ago
Select Alaska Airlines flight, departing Sat, Feb 7 from Seattle to Ontario, returning Sun, Feb 8, priced at CA $225 found 2 days ago
Thu, Feb 26 - Sun, Mar 1
SEA
Seattle
ONT
Ontario
CA $226 Roundtrip, found 1 day ago
CA $226
Roundtrip
found 1 day ago
Select Alaska Airlines flight, departing Thu, Feb 26 from Seattle to Ontario, returning Sun, Mar 1, priced at CA $226 found 1 day ago
Wed, Apr 22 - Thu, May 14
SEA
Seattle
ONT
Ontario
CA $232 Roundtrip, found 5 days ago
CA $232
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Wed, Apr 22 from Seattle to Ontario, returning Thu, May 14, priced at CA $232 found 5 days ago
Thu, Apr 23 - Wed, May 13
SEA
Seattle
ONT
Ontario
CA $233 Roundtrip, found 5 days ago
CA $233
Roundtrip
found 5 days ago
Select Alaska Airlines flight, departing Thu, Apr 23 from Seattle to Ontario, returning Wed, May 13, priced at CA $233 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.