Alaska Airlines Flights from Boston to San Francisco

Lowest fares from Boston to San Francisco

Mar 2026
From$229*
Seen: 1 hour ago
Flight Type One Way|Saver
Apr 2026
From$149*
Seen: 1 hour ago
Flight Type One Way|Saver
May 2026
From$169*
Seen: 1 hour ago
Flight Type One Way|Saver
$169
$780
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    • Range$169-$780

    *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 San Francisco.*

    $
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    One-way low-fare flights Boston to San Francisco.*
    From
    To
    Fare Type
    Dates
    Price
    Boston (BOS)San Francisco (SFO)One-way
    |
    Saver    		Depart: Apr 28, 2026

    From

    $149

    Seen: 1 hour ago

    Boston (BOS)San Francisco (SFO)One-way
    |
    Saver    		Depart: Aug 20, 2026

    From

    $164

    Seen: 1 hour ago

    Boston (BOS)San Francisco (SFO)One-way
    |
    Saver    		Depart: Aug 25, 2026

    From

    $164

    Seen: 1 hour ago

    Boston (BOS)San Francisco (SFO)One-way
    |
    Saver    		Depart: Sep 5, 2026

    From

    $164

    Seen: 1 hour ago

    Boston (BOS)San Francisco (SFO)One-way
    |
    Saver    		Depart: Sep 8, 2026

    From

    $164

    Seen: 1 hour ago

    Boston (BOS)San Francisco (SFO)One-way
    |
    Saver    		Depart: Aug 18, 2026

    From

    $164

    Seen: 1 hour ago

    Boston (BOS)San Francisco (SFO)One-way
    |
    Saver    		Depart: Aug 21, 2026

    From

    $164

    Seen: 1 hour ago

    Boston (BOS)San Francisco (SFO)One-way
    |
    Saver    		Depart: Aug 26, 2026

    From

    $164

    Seen: 1 hour 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.

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