₹9,557 Cheap Flights from Ontario (ONT) to Seattle (SEA)

View ₹9,557 flight on Sat, 1 Nov 2025Opens in a new window

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to Seattle-Tacoma International Airport (SEA)

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

Prices were available within the past 7 days and start at ₹9,557 for one-way flights and ₹15,617 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, 30 Sept - Wed, 15 Oct
ONT
Ontario
SEA
Seattle
₹15,617 Return, found 3 hours ago
₹15,617
Return
found 3 hours ago
Select Delta flight, departing Tue, 30 Sept from Ontario to Seattle, returning Wed, 15 Oct, priced at ₹15,617 found 3 hours ago
Delta
Tue, 30 Sept - Mon, 6 Oct
ONT
Ontario
SEA
Seattle
₹16,487 Return, found 2 days ago
₹16,487
Return
found 2 days ago
Select Delta flight, departing Tue, 30 Sept from Ontario to Seattle, returning Mon, 6 Oct, priced at ₹16,487 found 2 days ago
Delta
Fri, 3 Oct - Wed, 15 Oct
ONT
Ontario
SEA
Seattle
₹16,498 Return, found 3 hours ago
₹16,498
Return
found 3 hours ago
Select Delta flight, departing Fri, 3 Oct from Ontario to Seattle, returning Wed, 15 Oct, priced at ₹16,498 found 3 hours ago
Delta
Fri, 21 Nov - Thu, 27 Nov
ONT
Ontario
SEA
Seattle
₹17,369 Return, found 3 days ago
₹17,369
Return
found 3 days ago
Select Delta flight, departing Fri, 21 Nov from Ontario to Seattle, returning Thu, 27 Nov, priced at ₹17,369 found 3 days ago
Delta
Fri, 3 Oct - Thu, 16 Oct
ONT
Ontario
SEA
Seattle
₹17,380 Return, found 3 hours ago
₹17,380
Return
found 3 hours ago
Select Delta flight, departing Fri, 3 Oct from Ontario to Seattle, returning Thu, 16 Oct, priced at ₹17,380 found 3 hours ago
Delta
Tue, 30 Sept - Mon, 13 Oct
ONT
Ontario
SEA
Seattle
₹18,261 Return, found 3 hours ago
₹18,261
Return
found 3 hours ago
Select Delta flight, departing Tue, 30 Sept from Ontario to Seattle, returning Mon, 13 Oct, priced at ₹18,261 found 3 hours ago
Delta
Tue, 23 Sept - Sat, 27 Sept
ONT
Ontario
SEA
Seattle
₹20,889 Return, found 6 days ago
₹20,889
Return
found 6 days ago
Select Delta flight, departing Tue, 23 Sept from Ontario to Seattle, returning Sat, 27 Sept, priced at ₹20,889 found 6 days ago
Delta
Fri, 21 Nov - Thu, 27 Nov
ONT
Ontario
SEA
Seattle
₹20,895 Return, found 3 days ago
₹20,895
Return
found 3 days ago
Select Delta flight, departing Fri, 21 Nov from Ontario to Seattle, returning Thu, 27 Nov, priced at ₹20,895 found 3 days ago
United
Tue, 30 Sept - Mon, 6 Oct
ONT
Ontario
SEA
Seattle
₹21,316 Return, found 2 days ago
₹21,316
Return
found 2 days ago
Select United flight, departing Tue, 30 Sept from Ontario to Seattle, returning Mon, 6 Oct, priced at ₹21,316 found 2 days ago
American Airlines
Tue, 30 Sept - Mon, 6 Oct
ONT
Ontario
SEA
Seattle
₹23,960 Return, found 2 days ago
₹23,960
Return
found 2 days ago
Select American Airlines flight, departing Tue, 30 Sept from Ontario to Seattle, returning Mon, 6 Oct, priced at ₹23,960 found 2 days ago

Find the cheapest month to fly from Ontario (ONT) to Seattle (SEA)

March is typically the cheapest month to fly

From ₹7,057 - ₹25,266 per traveller.
Flight from Ontario to Seattle route information
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Seattle - Tacoma Intl.
Return price
₹15,617
Distance
1530 km
Average flight time
2 hours 47 mins

Los Angeles to Seattle Flights

Sometimes you just need to get out of town or maybe you’re looking for a change of scenery. Regardless of the reason, a flight from Los Angeles to Seattle will do just the trick! Go on, plan to see all the famous landmarks and eat your weight in the local cuisine. Your trip is beckoning, so answer the call by packing your suitcase and filling your travel itinerary with exploring Seattle.

Whether you’re flying for business or jet-setting on your personal time, you’ve come to the right place. Here at Expedia.com, we’ll pair you up with ONT to SEA flights that won’t make your bank account wince. Ready to temporarily leave behind Los Angeles for new horizons? Browse through our cheap airfare, and filter by flight times and dates until you find just what you had in mind. From flights without layovers to ones that arrive early in the morning, you’ll come across plane tickets that suit your travel preferences. You can even bundle your flight to SEA with hotels and car rentals to score even bigger savings.

All set to hit the clouds? Book your travel arrangements with us today and have left-over money to put toward your travel outings and adventures.

Frequently asked questions

How much is a flight from Ontario Airport to Sea-Tac Airport?
If you're travelling between Ontario Airport and Seattle - Tacoma Intl. Airport (SEA), round-trip journeys start from ₹15,617. This figure is based on fares quoted within the last 7 days on Expedia for flights departing within the next year, so don't hang about. Book now and save yourself both money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Los Angeles - Ontario Intl. Airport (ONT) to Sea-Tac Airport?
We understand that things come up unexpectedly, so we've made it as simple as possible for you to cancel your trip online. Just visit the Customer Service Portal and follow the instructions.
How do I find cheap flights from Ontario Airport to Seattle - Tacoma Intl. Airport (SEA) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Los Angeles - Ontario Intl. Airport (ONT) to Seattle - Tacoma Intl. Airport (SEA) flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Los Angeles - Ontario Intl. Airport (ONT) to SEA?
The flight distance from Los Angeles - Ontario Intl. Airport (ONT) to Sea-Tac Airport is 1,550 kilometres. Pack yourself a drink, some snacks and an interesting novel to read. Keep yourself busy in the air and time will zip by.
Which airlines fly direct from Los Angeles - Ontario Intl. Airport (ONT) to Seattle - Tacoma Intl. Airport (SEA)?
Many travellers choose to fly with Alaska Airlines (AS) from Ontario Airport to Seattle - Tacoma Intl. Airport (SEA). This leading airline offers 117 flights monthly, so you can easily find a flight time that works for you. Another carrier operating on this route is Delta Air Lines (DL). You'll have 86 flights every month to choose from.
Are Ontario Airport to Seattle - Tacoma Intl. Airport (SEA) flight tickets cheaper when they're purchased at the last minute?
Last-minute planners can sometimes pick up a bargain, with some super cheap airfares from ONT to Sea-Tac Airport popping up a few weeks prior to the departure date. If you'd rather book ahead of time, Expedia compares and updates all the best flight deals regularly — as early as a year in advance in some cases. It does depend on the carrier though, as not all airlines release prices so far in advance.

Explore a world of travel with Expedia

Seattle Airports

Seattle Paine Field Intl. Airport

Ontario Airports

Los Angeles

Los Angeles Intl. to Seattle
₹17,351.00

Orange County

John Wayne to Seattle
₹17,351.00

Burbank

*Available to Expedia members.