FFL Helper

FFL Helper / Seattle / Ontario

SEA → ONT

Seattle to Ontario

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

Lowest fare $99
Distance 968 mi
Flight time 2h 51m
Airports SEA–ONT
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By month: August 2026 from $99 · September 2026 from $103

Price calendar

August 2026

From $99 · up to $159

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27 $99 28 $159 29 $110
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September 2026

From $103 · up to $142

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9 $103 10 $123 11 $123 12 $142
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Upcoming dates

Ontario ONT

$99

Aug 27, 11:54am · 2h 51m · 0 stops

SEA → ONT · Frontier Airlines

Tickets

Ontario ONT

$103

Sep 09, 10:53am · 2h 52m · 0 stops

SEA → ONT · Frontier Airlines

Tickets

About this route

This calendar shows dated one-way fares from Seattle to Ontario. 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 Seattle to Ontario.