Alaska Airlines Flights from Boston to Seattle

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Lowest fares from Boston to Seattle

Jul 2025
From$139*
Seen: 5 hours ago
Flight Type One Way|Saver
$139
$409
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    • Range$139-$409

    *Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.

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

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    One-way low-fare flights Boston to Seattle.*
    From
    To
    Fare Type
    Dates
    Price
    Boston (BOS)Seattle (SEA)One-way
    |
    Saver    		Depart: Sep 3, 2025

    From

    $109

    Seen: 21 hours ago

    Boston (BOS)Seattle (SEA)One-way
    |
    Saver    		Depart: Oct 21, 2025

    From

    $109

    Seen: 21 hours ago

    Boston (BOS)Seattle (SEA)One-way
    |
    Saver    		Depart: Oct 25, 2025

    From

    $109

    Seen: 21 hours ago

    Boston (BOS)Seattle (SEA)One-way
    |
    Saver    		Depart: Nov 4, 2025

    From

    $109

    Seen: 21 hours ago

    Boston (BOS)Seattle (SEA)One-way
    |
    Saver    		Depart: Nov 15, 2025

    From

    $109

    Seen: 21 hours ago

    Boston (BOS)Seattle (SEA)One-way
    |
    Saver    		Depart: Nov 18, 2025

    From

    $109

    Seen: 21 hours ago

    Boston (BOS)Seattle (SEA)One-way
    |
    Saver    		Depart: Oct 8, 2025

    From

    $109

    Seen: 21 hours ago

    Boston (BOS)Seattle (SEA)One-way
    |
    Saver    		Depart: Oct 7, 2025

    From

    $109

    Seen: 21 hours ago

    *Displayed prices have been available within the past 24 hours and may not be available at the time of booking. Fares listed may be Saver fares, which is our most restrictive fare option and subject to additional restrictions. For roundtrip journeys, the price displayed—available within the past 24 hours—is the aggregate of the lowest available fare each way. Additional baggage charges and fees for optional products and services may apply. Other terms and conditions may apply.

    Looking for more? See other routes