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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
Southwest Airlines
United
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 4 days ago

Select Delta flight, departing Sat, Oct 17 from Ontario to Seattle, returning Sat, Oct 24, priced at NT$6,977 Found 4 days ago

Sun, Aug 23 - Wed, Sep 9

ONT

Ontario

SEA

Seattle

NT$7,602

Roundtrip

Found 6 days ago

Select Delta flight, departing Sun, Aug 23 from Ontario to Seattle, returning Wed, Sep 9, priced at NT$7,602 Found 6 days ago

Tue, Sep 1 - Wed, Sep 9

ONT

Ontario

SEA

Seattle

NT$7,627

Roundtrip

Found 1 hour ago

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

Tue, Sep 1 - Thu, Sep 10

ONT

Ontario

SEA

Seattle

NT$7,949

Roundtrip

Found 1 hour ago

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

Wed, Sep 2 - Wed, Sep 9

ONT

Ontario

PAE

Seattle

NT$8,259

Roundtrip

Found 1 hour ago

Select Alaska Airlines flight, departing Wed, Sep 2 from Ontario to Seattle, returning Wed, Sep 9, priced at NT$8,259 Found 1 hour ago

Fri, Nov 13 - Sun, Nov 15

ONT

Ontario

SEA

Seattle

NT$8,264

Roundtrip

Found 4 days ago

Select Delta flight, departing Fri, Nov 13 from Ontario to Seattle, returning Sun, Nov 15, priced at NT$8,264 Found 4 days ago

Sun, Sep 6 - Wed, Sep 9

ONT

Ontario

PAE

Seattle

NT$8,581

Roundtrip

Found 1 hour ago

Select Alaska Airlines flight, departing Sun, Sep 6 from Ontario to Seattle, returning Wed, Sep 9, priced at NT$8,581 Found 1 hour ago

Sat, Oct 17 - Sat, Oct 24

ONT

Ontario

SEA

Seattle

NT$8,585

Roundtrip

Found 4 days ago

Select Delta flight, departing Sat, Oct 17 from Ontario to Seattle, returning Sat, Oct 24, priced at NT$8,585 Found 4 days ago

Sat, Oct 17 - Sat, Oct 24

ONT

Ontario

SEA

Seattle

NT$9,545

Roundtrip

Found 4 days ago

Select United flight, departing Sat, Oct 17 from Ontario to Seattle, returning Sat, Oct 24, priced at NT$9,545 Found 4 days ago

Sat, Oct 17 - Sat, Oct 24

ONT

Ontario

SEA

Seattle

NT$10,182

Roundtrip

Found 4 days ago

Select American Airlines flight, departing Sat, Oct 17 from Ontario to Seattle, returning Sat, Oct 24, priced at NT$10,182 Found 4 days ago

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, Southwest Airlines, United, 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)

Travel information

Explore a world of travel with Expedia