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Flights from Ontario Intl. Airport (ONT) to Seattle-Tacoma International Airport (SEA)
Flights to Seattle
Washington
United States of America
Flights
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Popular airlines from Ontario Intl. Airport (ONT) to Seattle-Tacoma International Airport (SEA)

Alaska Airlines
Frontier Airlines
Delta
United
Southwest Airlines
American Airlines
JetBlue Airways

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Cheap Flights from Ontario to Seattle (ONT-SEA)

Prices were available within the past 7 days and start at NT$4,443 for one-way flights and NT$6,977 for roundtrip, for the period specified. Prices and availability are subject to change.

All deals

One way

Roundtrip

Sat, Oct 17 - Sat, Oct 24

ONT

Ontario

SEA

Seattle

NT$6,977

Roundtrip

Found 1 day ago

Select Delta flight, departing Sat, Oct 17 from Ontario to Seattle, returning Sat, Oct 24, priced at NT$6,977 Found 1 day ago

Sun, Aug 23 - Wed, Sep 9

ONT

Ontario

SEA

Seattle

NT$7,602

Roundtrip

Found 3 days ago

Select Delta flight, departing Sun, Aug 23 from Ontario to Seattle, returning Wed, Sep 9, priced at NT$7,602 Found 3 days ago

Fri, Nov 13 - Sun, Nov 15

ONT

Ontario

SEA

Seattle

NT$8,264

Roundtrip

Found 1 day ago

Select Delta flight, departing Fri, Nov 13 from Ontario to Seattle, returning Sun, Nov 15, priced at NT$8,264 Found 1 day ago

Sat, Oct 17 - Sat, Oct 24

ONT

Ontario

SEA

Seattle

NT$8,585

Roundtrip

Found 1 day ago

Select Delta flight, departing Sat, Oct 17 from Ontario to Seattle, returning Sat, Oct 24, priced at NT$8,585 Found 1 day ago

Sat, Aug 29 - Sun, Aug 30

ONT

Ontario

SEA

Seattle

NT$8,901

Roundtrip

Found 8 hours ago

Select Delta flight, departing Sat, Aug 29 from Ontario to Seattle, returning Sun, Aug 30, priced at NT$8,901 Found 8 hours ago

Fri, Nov 13 - Sun, Nov 15

ONT

Ontario

SEA

Seattle

NT$9,544

Roundtrip

Found 1 day ago

Select Delta flight, departing Fri, Nov 13 from Ontario to Seattle, returning Sun, Nov 15, priced at NT$9,544 Found 1 day ago

Sat, Oct 17 - Sat, Oct 24

ONT

Ontario

SEA

Seattle

NT$9,545

Roundtrip

Found 1 day ago

Select United flight, departing Sat, Oct 17 from Ontario to Seattle, returning Sat, Oct 24, priced at NT$9,545 Found 1 day ago

Tue, Sep 1 - Tue, Sep 15

ONT

Ontario

SEA

Seattle

NT$9,550

Roundtrip

Found 1 day ago

Select Delta flight, departing Tue, Sep 1 from Ontario to Seattle, returning Tue, Sep 15, priced at NT$9,550 Found 1 day ago

Sat, Oct 17 - Sat, Oct 24

ONT

Ontario

SEA

Seattle

NT$10,182

Roundtrip

Found 1 day ago

Select American Airlines flight, departing Sat, Oct 17 from Ontario to Seattle, returning Sat, Oct 24, priced at NT$10,182 Found 1 day ago

Sat, Jul 25 - Sat, Aug 1

ONT

Ontario

SEA

Seattle

NT$13,532

Roundtrip

Found 3 days ago

Select Alaska Airlines flight, departing Sat, Jul 25 from Ontario to Seattle, returning Sat, Aug 1, priced at NT$13,532 Found 3 days ago

Alternative airports near Seattle

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Seattle - Tacoma Intl. SEA. Cheapest option available. Average driving time to city center is 20 minutes. Flights from NT$15,452

SEA

Seattle - Tacoma Intl.

Cheapest

20 min

Flights from NT$15,452

Travel information

Origin airport	Ontario Intl. Airport
Destination airport	Seattle-Tacoma International Airport
Distance	1,539 km away
Airlines serving	Alaska Airlines, Frontier Airlines, Delta, United, Southwest Airlines, American Airlines, JetBlue Airways
Popular airline	Alaska Airlines
Roundtrip price	NT$6,977
Average flight time	2 hours 51 mins

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NT$4,443 Cheap Flights from Ontario Intl. Airport (ONT) to Seattle (SEA)

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

Be in the know

Book smarter

Earn twice

Cheap Flights from Ontario to Seattle (ONT-SEA)

Alternative airports near Seattle

Travel information

Explore a world of travel with Expedia