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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$4,471 for one-way flights and NT$7,827 for roundtrip, for the period specified. Prices and availability are subject to change.

All deals

One way

Roundtrip

Sat, Sep 19 - Mon, Sep 21

ONT

Ontario

SEA

Seattle

NT$7,827

Roundtrip

Found 3 days ago

Select Delta flight, departing Sat, Sep 19 from Ontario to Seattle, returning Mon, Sep 21, priced at NT$7,827 Found 3 days ago

Sat, Sep 19 - Mon, Sep 21

ONT

Ontario

SEA

Seattle

NT$9,925

Roundtrip

Found 3 days ago

Select Delta flight, departing Sat, Sep 19 from Ontario to Seattle, returning Mon, Sep 21, priced at NT$9,925 Found 3 days ago

Sat, Sep 19 - Mon, Sep 21

ONT

Ontario

SEA

Seattle

NT$10,092

Roundtrip

Found 3 days ago

Select Delta flight, departing Sat, Sep 19 from Ontario to Seattle, returning Mon, Sep 21, priced at NT$10,092 Found 3 days ago

Thu, Sep 24 - Fri, Sep 25

ONT

Ontario

SEA

Seattle

NT$10,267

Roundtrip

Found 1 day ago

Select Delta flight, departing Thu, Sep 24 from Ontario to Seattle, returning Fri, Sep 25, priced at NT$10,267 Found 1 day ago

Sat, Sep 19 - Mon, Sep 21

ONT

Ontario

SEA

Seattle

NT$10,410

Roundtrip

Found 3 days ago

Select United flight, departing Sat, Sep 19 from Ontario to Seattle, returning Mon, Sep 21, priced at NT$10,410 Found 3 days ago

Thu, Sep 24 - Fri, Sep 25

ONT

Ontario

SEA

Seattle

NT$10,585

Roundtrip

Found 1 day ago

Select Delta flight, departing Thu, Sep 24 from Ontario to Seattle, returning Fri, Sep 25, priced at NT$10,585 Found 1 day ago

Thu, Sep 24 - Fri, Sep 25

ONT

Ontario

SEA

Seattle

NT$10,910

Roundtrip

Found 1 day ago

Select Delta flight, departing Thu, Sep 24 from Ontario to Seattle, returning Fri, Sep 25, priced at NT$10,910 Found 1 day ago

Sat, Sep 19 - Mon, Sep 21

ONT

Ontario

SEA

Seattle

NT$11,236

Roundtrip

Found 3 days ago

Select Delta flight, departing Sat, Sep 19 from Ontario to Seattle, returning Mon, Sep 21, priced at NT$11,236 Found 3 days ago

Sat, Sep 19 - Mon, Sep 21

ONT

Ontario

SEA

Seattle

NT$11,381

Roundtrip

Found 3 days ago

Select American Airlines flight, departing Sat, Sep 19 from Ontario to Seattle, returning Mon, Sep 21, priced at NT$11,381 Found 3 days ago

Fri, Sep 4 - Mon, Sep 7

ONT

Ontario

SEA

Seattle

NT$12,702

Roundtrip

Found 9 hours ago

Select Alaska Airlines flight, departing Fri, Sep 4 from Ontario to Seattle, returning Mon, Sep 7, priced at NT$12,702 Found 9 hours 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$7,827
Average flight time	2 hours 49 mins

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NT$4,471 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