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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$4,463 for one-way flights and NT$7,636 for roundtrip, for the period specified. Prices and availability are subject to change.

All deals

One way

Roundtrip

Sat, Sep 12 - Sun, Sep 13

ONT

Ontario

SEA

Seattle

NT$7,636

Roundtrip

Found 5 days ago

Select Delta flight, departing Sat, Sep 12 from Ontario to Seattle, returning Sun, Sep 13, priced at NT$7,636 Found 5 days ago

Wed, Sep 9 - Sun, Sep 13

ONT

Ontario

SEA

Seattle

NT$7,823

Roundtrip

Found 1 day ago

Select Delta flight, departing Wed, Sep 9 from Ontario to Seattle, returning Sun, Sep 13, priced at NT$7,823 Found 1 day ago

Sat, Sep 26 - Sun, Sep 27

ONT

Ontario

SEA

Seattle

NT$7,840

Roundtrip

Found 1 day ago

Select Delta flight, departing Sat, Sep 26 from Ontario to Seattle, returning Sun, Sep 27, priced at NT$7,840 Found 1 day ago

Sat, Sep 26 - Sun, Sep 27

ONT

Ontario

SEA

Seattle

NT$9,137

Roundtrip

Found 1 day ago

Select Delta flight, departing Sat, Sep 26 from Ontario to Seattle, returning Sun, Sep 27, priced at NT$9,137 Found 1 day ago

Fri, Aug 21 - Tue, Aug 25

ONT

Ontario

SEA

Seattle

NT$9,277

Roundtrip

Found 2 days ago

Select Delta flight, departing Fri, Aug 21 from Ontario to Seattle, returning Tue, Aug 25, priced at NT$9,277 Found 2 days ago

Thu, Sep 10 - Sun, Sep 13

ONT

Ontario

SEA

Seattle

NT$9,408

Roundtrip

Found 5 days ago

Select Delta flight, departing Thu, Sep 10 from Ontario to Seattle, returning Sun, Sep 13, priced at NT$9,408 Found 5 days ago

Sat, Sep 26 - Sun, Sep 27

ONT

Ontario

SEA

Seattle

NT$9,454

Roundtrip

Found 1 day ago

Select Delta flight, departing Sat, Sep 26 from Ontario to Seattle, returning Sun, Sep 27, priced at NT$9,454 Found 1 day ago

Thu, Sep 3 - Fri, Sep 4

ONT

Ontario

SEA

Seattle

NT$10,215

Roundtrip

Found 4 days ago

Select Alaska Airlines flight, departing Thu, Sep 3 from Ontario to Seattle, returning Fri, Sep 4, priced at NT$10,215 Found 4 days ago

Sat, Sep 12 - Sun, Sep 13

ONT

Ontario

SEA

Seattle

NT$10,524

Roundtrip

Found 5 days ago

Select United flight, departing Sat, Sep 12 from Ontario to Seattle, returning Sun, Sep 13, priced at NT$10,524 Found 5 days ago

Wed, Sep 9 - Sun, Sep 13

ONT

Ontario

SEA

Seattle

NT$11,207

Roundtrip

Found 1 day ago

Select American Airlines flight, departing Wed, Sep 9 from Ontario to Seattle, returning Sun, Sep 13, priced at NT$11,207 Found 1 day 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, United, Southwest Airlines, American Airlines, JetBlue Airways
Popular airline	Alaska Airlines
Roundtrip price	NT$7,636
Average flight time	2 hours 50 mins

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NT$4,463 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