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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 Tue, Jan 27th 2026
From $113

Alaska Airlines
AS 489 (Direct)
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Fly on Fri, Mar 6th 2026
From $123

Alaska Airlines
AS 6829 (Direct)
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Fly on Thu, Dec 11th 2025
From $219

Frontier Airlines
F9 2408 (1 Transfer)
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Fly on Sun, Aug 2nd 2026
From $274

Alaska Airlines
AS 467 (Direct)
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