Southwest® flights from Boston to San Antonio from $145

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Low fares from Boston to San Antonio

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Boston (BOS)to

San Antonio (SAT)
Depart: 10/06/2026

One-way

Basic

From
$145
Seen: 22 hrs ago

Boston (BOS)to

San Antonio (SAT)
Depart: 11/20/2026

One-way

Basic

From
$145
Seen: 19 hrs ago

Boston (BOS)to

San Antonio (SAT)
Depart: 10/23/2026

One-way

Basic

From
$155
Seen: 13 hrs ago

Boston (BOS)to

San Antonio (SAT)
Depart: 10/29/2026

One-way

Basic

From
$155
Seen: 5 hrs ago

Boston (BOS)to

San Antonio (SAT)
Depart: 10/31/2026

One-way

Basic

From
$173
Seen: 20 hrs ago

Boston (BOS)to

San Antonio (SAT)
Depart: 10/10/2026

One-way

Basic

From
$175
Seen: 19 hrs ago

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Explore flights from Boston to San Antonio

Sep 2026
From$225*
Seen: 23 hrs ago
One Way/Basic
Oct 2026
From$145*
Seen: 22 hrs ago
One Way/Basic
Nov 2026
From$145*
Seen: 19 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $145
cmp-daily-histogram-bars-legend-max-price-aria-label $385
Displaying fares for September-2026
  • BOS–SAT, 09/12/2026: From $385
    12

    Sat

    SEP

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    13

    Sun

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    14

    Mon

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    15

    Tue

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    16

    Wed

  • BOS–SAT, 09/17/2026: From $385
    17

    Thu

  • BOS–SAT, 09/18/2026: From $275
    18

    Fri

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

    Sat

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    20

    Sun

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    21

    Mon

  • BOS–SAT, 09/22/2026: From $285
    22

    Tue

  • BOS–SAT, 09/23/2026: From $285
    23

    Wed

  • BOS–SAT, 09/24/2026: From $285
    24

    Thu

  • BOS–SAT, 09/25/2026: From $235
    25

    Fri

  • BOS–SAT, 09/26/2026: From $235
    26

    Sat

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    27

    Sun

  • BOS–SAT, 09/28/2026: From $330
    28

    Mon

  • BOS–SAT, 09/29/2026: From $225
    29

    Tue

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

    Wed

  • BOS–SAT, 10/01/2026: From $235
    01

    Thu

    OCT

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    02

    Fri

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    03

    Sat

  • BOS–SAT, 10/04/2026: From $284
    04

    Sun

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    05

    Mon

  • BOS–SAT, 10/06/2026: From $145
    06

    Tue

  • BOS–SAT, 10/07/2026: From $185
    07

    Wed

  • BOS–SAT, 10/08/2026: From $205
    08

    Thu

  • BOS–SAT, 10/09/2026: From $274
    09

    Fri

  • BOS–SAT, 10/10/2026: From $175
    10

    Sat

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

    Sun

    • Range$145-$385

    *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 Antonio International Airport
    Distance:
    1764 miles

    Route Information

    138† 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 138 weekly flights from Boston to San Antonio on Southwest Airlines.
    To find the lowest fares by day and time to fly Boston to San Antonio with Southwest, check out our Low Fare Calendar.
    You can rent a car at San Antonio International Airport book yours with your flight.
    Yes! Flights from Boston to San Antonio—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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