Alaska Airlines Flights from Ontario to Seattle

DPA Name: DPA QA Test - Details / example to Los Angeles/LAX

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Cheap flights from Ontario to Seattle

Lowest fares from Ontario to Seattle

Mar 2026
From$99*
Seen: 1 hour ago
Flight Type One Way|Economy Class
Apr 2026
From$89*
Seen: 14 hours ago
Flight Type One Way|Economy Class
May 2026
From$89*
Seen: 14 hours ago
Flight Type One Way|Economy Class
$89
$477
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    • Range$89-$477

    *Fares and availability are based on round trip searches for 1 passenger (1 adult) in Economy class in the last 48 hours. Fares are inclusive of tax and surcharges, and subject to availability. link.

    One-way low-fare flights Ontario to Seattle.*

    $
    One-way low-fare flights Ontario to Seattle.*
    From
    To
    Fare Type
    Dates
    Price
    Ontario (ONT)Seattle (SEA)One-way
    |
    Economy    		Depart: Oct 14, 2026

    From

    $149

    Seen: 7 hours ago

    *Prices have been available for one-way trips within the last 48 hours and may not be currently available. Fares listed may be Saver fares which is our most restrictive fare option and subject to additional restrictions. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.