Southwest® flights from St. Louis to San Antonio from $149

Promo Code

Low fares from St. Louis to San Antonio

$

St. Louis (STL)to

San Antonio (SAT)
Depart: 09/06/2026

One-way

Basic

From
$149
Seen: 10 hrs ago

St. Louis (STL)to

San Antonio (SAT)
Depart: 09/11/2026

One-way

Basic

From
$149
Seen: 43 minutes ago

St. Louis (STL)to

San Antonio (SAT)
Depart: 09/05/2026

One-way

Basic

From
$149
Seen: 10 hrs ago

St. Louis (STL)to

San Antonio (SAT)
Depart: 09/29/2026

One-way

Basic

From
$159
Seen: 23 hrs ago

St. Louis (STL)to

San Antonio (SAT)
Depart: 10/01/2026

One-way

Basic

From
$159
Seen: 18 hrs ago

St. Louis (STL)to

San Antonio (SAT)
Depart: 09/22/2026

One-way

Basic

From
$159
Seen: 13 hrs ago

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Explore flights from St. Louis to San Antonio

Aug 2026
From$159*
Seen: 1 hour ago
One Way/Basic
Sep 2026
From$149*
Seen: 10 hrs ago
One Way/Basic
Oct 2026
From$159*
Seen: 2 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $159
cmp-daily-histogram-bars-legend-max-price-aria-label $519
Displaying fares for August-2026
  • STL–SAT, 08/03/2026: From $514
    03

    Mon

    AUG

  • STL–SAT, 08/04/2026: From $519
    04

    Tue

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

    Wed

  • STL–SAT, 08/06/2026: From $519
    06

    Thu

  • STL–SAT, 08/07/2026: From $519
    07

    Fri

  • STL–SAT, 08/08/2026: From $455
    08

    Sat

  • STL–SAT, 08/09/2026: From $455
    09

    Sun

  • STL–SAT, 08/10/2026: From $455
    10

    Mon

  • STL–SAT, 08/11/2026: From $455
    11

    Tue

  • STL–SAT, 08/12/2026: From $455
    12

    Wed

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

    Thu

  • STL–SAT, 08/14/2026: From $455
    14

    Fri

  • STL–SAT, 08/15/2026: From $455
    15

    Sat

  • STL–SAT: cmp-view-offers-disclaimer. Find Offers
    16

    Sun

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

    Mon

  • STL–SAT, 08/18/2026: From $280
    18

    Tue

  • STL–SAT, 08/19/2026: From $280
    19

    Wed

  • STL–SAT, 08/20/2026: From $280
    20

    Thu

  • STL–SAT, 08/21/2026: From $280
    21

    Fri

  • STL–SAT, 08/22/2026: From $159
    22

    Sat

  • STL–SAT, 08/23/2026: From $230
    23

    Sun

  • STL–SAT: cmp-view-offers-disclaimer. Find Offers
    24

    Mon

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

    Tue

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

    Wed

  • STL–SAT, 08/27/2026: From $159
    27

    Thu

  • STL–SAT, 08/28/2026: From $159
    28

    Fri

  • STL–SAT, 08/29/2026: From $159
    29

    Sat

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

    Sun

  • STL–SAT, 08/31/2026: From $159
    31

    Mon

  • STL–SAT, 09/01/2026: From $159
    01

    Tue

    SEP

  • STL–SAT, 09/02/2026: From $159
    02

    Wed

    • Range$159-$519

    *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:
    Lambert-St Louis Int'l Airport
    Arriving at:
    San Antonio International Airport
    Average flight time:
    2 hours 14 minutes
    Distance:
    786 miles

    Route Information

    156† Weekly flights
    • 1‡ Nonstop flight per day Monday through Friday
    • 1‡ Nonstop flight on Saturday
    • 1‡ Nonstop flight on Sunday

    † 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

    The average flight time from St. Louis to San Antonio is 2 hours 14 minutes.
    There are 156 weekly flights from St. Louis to San Antonio on Southwest Airlines.
    Yes, Southwest flies nonstop from St. Louis to San Antonio once per day from Monday through Friday.
    Yes, Southwest flies nonstop from St. Louis to San Antonio once per day on Saturdays and Sundays.
    To find the lowest fares by day and time to fly St. Louis 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 St. Louis 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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