Southwest® flights from Boston to San Francisco from $174

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Low fares from Boston to San Francisco

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Boston (BOS)to

San Francisco (SFO)
Depart: 09/12/2026

One-way

Basic

From
$174
Seen: 11 hrs ago

Boston (BOS)to

San Francisco (SFO)
Depart: 11/04/2026

One-way

Basic

From
$174
Seen: 22 hrs ago

Boston (BOS)to

San Francisco (SFO)
Depart: 09/19/2026

One-way

Basic

From
$179
Seen: 14 hrs ago

Boston (BOS)to

San Francisco (SFO)
Depart: 09/05/2026

One-way

Basic

From
$184
Seen: 15 hrs ago

Boston (BOS)to

San Francisco (SFO)
Depart: 08/29/2026

One-way

Basic

From
$184
Seen: 3 hrs ago

Boston (BOS)to

San Francisco (SFO)
Depart: 09/02/2026

One-way

Basic

From
$184
Seen: 11 hrs ago

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Explore flights from Boston to San Francisco

Aug 2026
From$184*
Seen: 3 hrs ago
One Way/Basic
Sep 2026
From$174*
Seen: 11 hrs ago
One Way/Basic
Oct 2026
From$214*
Seen: 4 minutes ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $184
cmp-daily-histogram-bars-legend-max-price-aria-label $449
Displaying fares for August-2026
  • BOS–SFO, 08/02/2026: From $439
    02

    Sun

    AUG

  • BOS–SFO, 08/03/2026: From $439
    03

    Mon

  • BOS–SFO, 08/04/2026: From $307
    04

    Tue

  • BOS–SFO, 08/05/2026: From $307
    05

    Wed

  • BOS–SFO, 08/06/2026: From $444
    06

    Thu

  • BOS–SFO, 08/07/2026: From $444
    07

    Fri

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    08

    Sat

  • BOS–SFO, 08/09/2026: From $449
    09

    Sun

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    10

    Mon

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    11

    Tue

  • BOS–SFO, 08/12/2026: From $307
    12

    Wed

  • BOS–SFO, 08/13/2026: From $329
    13

    Thu

  • BOS–SFO, 08/14/2026: From $329
    14

    Fri

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    15

    Sat

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    16

    Sun

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    17

    Mon

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    18

    Tue

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    19

    Wed

  • BOS–SFO, 08/20/2026: From $204
    20

    Thu

  • BOS–SFO, 08/21/2026: From $204
    21

    Fri

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    22

    Sat

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    23

    Sun

  • BOS–SFO, 08/24/2026: From $194
    24

    Mon

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    25

    Tue

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    26

    Wed

  • BOS–SFO, 08/27/2026: From $185
    27

    Thu

  • BOS–SFO, 08/28/2026: From $185
    28

    Fri

  • BOS–SFO, 08/29/2026: From $184
    29

    Sat

  • BOS–SFO: cmp-view-offers-disclaimer. Find Offers
    30

    Sun

  • BOS–SFO, 08/31/2026: From $185
    31

    Mon

  • BOS–SFO, 09/01/2026: From $184
    01

    Tue

    SEP

    • Range$184-$449

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    Logan International Airport
    Arriving at:
    San Francisco International Airport
    Distance:
    2704 miles

    Route Information

    98† Weekly flights

    † Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.

    ‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.

    Questions we hear the most

    There are 98 weekly flights from Boston to San Francisco on Southwest Airlines.
    To find the lowest fares by day and time to fly Boston to San Francisco with Southwest, check out our Low Fare Calendar.
    You can rent a car at San Francisco International Airport book yours with your flight.
    Yes! Flights from Boston to San Francisco—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

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