Southwest® flights from Boston to San Antonio from $135

Promo Code

Low fares from Boston to San Antonio

$

Boston (BOS)to

San Antonio (SAT)
Depart: 10/26/2026

One-way

Basic

From
$135
Seen: 21 hrs ago

Boston (BOS)to

San Antonio (SAT)
Depart: 10/17/2026

One-way

Basic

From
$135
Seen: 16 hrs ago

Boston (BOS)to

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

One-way

Basic

From
$135
Seen: 16 hrs ago

Boston (BOS)to

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

One-way

Basic

From
$135
Seen: 3 hrs ago

Boston (BOS)to

San Antonio (SAT)
Depart: 10/30/2026

One-way

Basic

From
$135
Seen: 21 hrs ago

Boston (BOS)to

San Antonio (SAT)
Depart: 11/07/2026

One-way

Basic

From
$135
Seen: 19 hrs ago

Looking for more low-fare flights?

Check out the Low Fare Calendar to find a fare that works for you. Just choose the month you want to depart and return, and we’ll show you the best fares available.

Find low fares

Explore flights from Boston to San Antonio

Aug 2026
From$265*
Seen: 3 hrs ago
One Way/Basic
Sep 2026
From$139*
Seen: 9 hrs ago
One Way/Basic
Oct 2026
From$135*
Seen: 21 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $139
cmp-daily-histogram-bars-legend-max-price-aria-label $365
Displaying fares for August-2026
  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    22

    Sat

    AUG

  • BOS–SAT, 08/23/2026: From $365
    23

    Sun

  • BOS–SAT, 08/24/2026: From $365
    24

    Mon

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

    Tue

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

    Wed

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

    Thu

  • BOS–SAT, 08/28/2026: From $265
    28

    Fri

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    29

    Sat

  • BOS–SAT, 08/30/2026: From $364
    30

    Sun

  • BOS–SAT, 08/31/2026: From $265
    31

    Mon

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    01

    Tue

    SEP

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

    Wed

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

    Thu

  • BOS–SAT, 09/04/2026: From $215
    04

    Fri

  • BOS–SAT, 09/05/2026: From $215
    05

    Sat

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    06

    Sun

  • BOS–SAT, 09/07/2026: From $280
    07

    Mon

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

    Tue

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    09

    Wed

  • BOS–SAT, 09/10/2026: From $139
    10

    Thu

  • BOS–SAT, 09/11/2026: From $152
    11

    Fri

  • BOS–SAT, 09/12/2026: From $139
    12

    Sat

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

    Sun

  • BOS–SAT, 09/14/2026: From $195
    14

    Mon

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

    Tue

  • BOS–SAT, 09/16/2026: From $139
    16

    Wed

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

    Thu

  • BOS–SAT, 09/18/2026: From $152
    18

    Fri

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

    Sat

  • BOS–SAT, 09/20/2026: From $275
    20

    Sun

  • BOS–SAT: cmp-view-offers-disclaimer. Find Offers
    21

    Mon

    • Range$139-$365

    *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.

    Explore Flights from Other Popular Origins

    Popular Flights from Boston