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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$4,453 for one-way flights and NT$7,627 for roundtrip, for the period specified. Prices and availability are subject to change.

All deals

One way

Roundtrip

Tue, Sep 1 - Wed, Sep 9

ONT

Ontario

SEA

Seattle

NT$7,627

Roundtrip

Found 2 days ago

Select Delta flight, departing Tue, Sep 1 from Ontario to Seattle, returning Wed, Sep 9, priced at NT$7,627 Found 2 days ago

Sat, Sep 12 - Sun, Sep 13

ONT

Ontario

SEA

Seattle

NT$7,636

Roundtrip

Found 4 hours ago

Select Delta flight, departing Sat, Sep 12 from Ontario to Seattle, returning Sun, Sep 13, priced at NT$7,636 Found 4 hours ago

Tue, Sep 1 - Thu, Sep 10

ONT

Ontario

SEA

Seattle

NT$7,949

Roundtrip

Found 2 days ago

Select Delta flight, departing Tue, Sep 1 from Ontario to Seattle, returning Thu, Sep 10, priced at NT$7,949 Found 2 days ago

Wed, Sep 2 - Wed, Sep 9

ONT

Ontario

PAE

Seattle

NT$8,259

Roundtrip

Found 2 days ago

Select Alaska Airlines flight, departing Wed, Sep 2 from Ontario to Seattle, returning Wed, Sep 9, priced at NT$8,259 Found 2 days ago

Sun, Sep 6 - Wed, Sep 9

ONT

Ontario

PAE

Seattle

NT$8,581

Roundtrip

Found 2 days ago

Select Alaska Airlines flight, departing Sun, Sep 6 from Ontario to Seattle, returning Wed, Sep 9, priced at NT$8,581 Found 2 days ago

Sat, Aug 29 - Sun, Aug 30

ONT

Ontario

SEA

Seattle

NT$8,901

Roundtrip

Found 6 days ago

Select Delta flight, departing Sat, Aug 29 from Ontario to Seattle, returning Sun, Aug 30, priced at NT$8,901 Found 6 days ago

Sat, Sep 5 - Sat, Sep 5

ONT

Ontario

SEA

Seattle

NT$9,044

Roundtrip

Found 2 days ago

Select Alaska Airlines flight, departing Sat, Sep 5 from Ontario to Seattle, returning Sat, Sep 5, priced at NT$9,044 Found 2 days ago

Tue, Sep 1 - Sun, Sep 6

ONT

Ontario

SEA

Seattle

NT$9,076

Roundtrip

Found 2 days ago

Select Delta flight, departing Tue, Sep 1 from Ontario to Seattle, returning Sun, Sep 6, priced at NT$9,076 Found 2 days ago

Wed, Sep 9 - Sun, Sep 13

ONT

Ontario

SEA

Seattle

NT$10,520

Roundtrip

Found 2 days ago

Select United flight, departing Wed, Sep 9 from Ontario to Seattle, returning Sun, Sep 13, priced at NT$10,520 Found 2 days ago

Thu, Sep 10 - Mon, Sep 14

ONT

Ontario

SEA

Seattle

NT$12,458

Roundtrip

Just found

Select American Airlines flight, departing Thu, Sep 10 from Ontario to Seattle, returning Mon, Sep 14, priced at NT$12,458 Just found

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$7,627
Average flight time	2 hours 52 mins

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NT$4,453 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)

Travel information

Explore a world of travel with Expedia