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Seattle ✈ Ontario

Cheapest airfares from Seattle to Ontario

Search for flight deals to Ontario

*All prices in AUD, prices may fluctuate slightly from the advertised price.
Fly on Sun, Feb 22nd 2026
From $143

Alaska Airlines
AS 592 (Direct)
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Fly on Fri, May 8th 2026
From $174

Alaska Airlines
AS 1364 (Direct)
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Fly on Fri, Jan 23rd 2026
From $257

Frontier Airlines
F9 3406 (1 Transfer)
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