Flights from Ontario/LA, CA to Seattle, WA

Promo Code

Best Deals on Flights From Ontario/LA, CA (ONT) to Seattle, WA (SEA)

Apr 2026
from$50*
Last seen: 5 hours ago
One-way/Economy
May 2026
from$44*
Last seen: 3 hours ago
One-way/Economy
Jun 2026
from$37*
Last seen: 7 hours ago
One-way/Economy
$50
$310
Displaying fares for April-2026
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    • Range$50-$310

    *Prices found by others in the previous 48 hours for round-trip flights. Prices shown may also require membership in our travel club, Discount Den.

    Flights Deals from Ontario/LA, CA to Seattle, WA on Frontier

    $
    Flights Deals from Ontario/LA, CA to Seattle, WA on Frontier
    From
    To
    Ontario/LA, CA (ONT)Seattle, WA (SEA)One-way
    /
    Discount Den Basic Fare    		Departing Jul 24, 2026

    From

    $95

    Last seen: 7 hours ago

    *Prices found by others in the previous 48 hours for one-way flights. Prices shown may also require membership in our travel club, Discount Den®.

    Ontario/LA, CA Seattle, WA

    More Popular Flights From Ontario/LA, CA and To Seattle, WA

    Barclays Badge

    Earn 50,000 Miles after qualifying activity. Plus $0 Intro Annual Fee, then $99.
    Terms Apply.