$159 Cheap American Airlines flights Ontario Intl. Airport (ONT) to Seattle (SEA)

View $159 flight on Sat, Sep 12, 2026Opens in a new window

$159 Cheap American Airlines flights Ontario Intl. Airport (ONT) to Seattle (SEA)

Prices were available within the past 7 days and start at $159 for one-way flights and $257 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Sep 12 - Tue, Sep 22
ONT
Ontario
SEA
Seattle
$257 Roundtrip, found 15 hours ago
$257
Roundtrip
found 15 hours ago
Select American Airlines flight, departing Sat, Sep 12 from Ontario to Seattle, returning Tue, Sep 22, priced at $257 found 15 hours ago

Find the cheapest month to fly from Ontario (ONT) to Seattle (SEA)

June is typically the cheapest month to fly

From $105 - $230 per traveler.

Travel information

Origin airport
Ontario Intl. Airport
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Alaska Airlines, American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Popular airline
Frontier Airlines
Distance
1530 km
Average flight time
2 hours 47 mins

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