FFL Helper

FFL Helper / Ontario / Seattle

ONT → SEA

Ontario to Seattle

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

Lowest fare $99
Distance 968 mi
Flight time 2h 49m
Airports ONT–SEA
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By month: August 2026 from $140 · September 2026 from $99

Price calendar

August 2026

From $140

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September 2026

From $99 · up to $148

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Upcoming dates

Seattle SEA

$99

Sep 02, 4:44pm · 2h 49m · 0 stops

ONT → SEA · Frontier Airlines

Tickets

Seattle SEA

$140

Aug 31, 5:17pm · 2h 45m · 0 stops

ONT → SEA · Frontier Airlines

Tickets

Seattle SEA

$148

Sep 05, 6:00am · 7h 22m · 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.