FFL Helper / Ontario / Seattle

ONT → SEA

Ontario (ONT) to Seattle (SEA)

Compare one-way fares for flights from Ontario to Seattle.

Lowest fare $106

Distance 968 mi

Flight time 8h 42m

Airports ONT–SEA

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By month: November 2026 from $106

Price calendar

October 2026

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November 2026

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Upcoming dates

Seattle SEA

$106

Nov 14, 6:30am · 8h 42m · 1 stop

ONT → SEA · Frontier Airlines

Tickets

About this route

This calendar shows dated one-way fares from Ontario to Seattle. Use it to see which days are cheaper before you search tickets.

Flight time and airport codes on this page are for the sample itinerary we have on file. Always confirm the live routing when you book Ontario to Seattle.