Southwest® flights from St. Louis to San Antonio from $174

Promo Code

Low fares from St. Louis to San Antonio

$

St. Louis (STL)to

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

One-way

Basic

From
$174
Seen: 10 hrs ago

St. Louis (STL)to

San Antonio (SAT)
Depart: 10/20/2026

One-way

Basic

From
$174
Seen: 10 hrs ago

St. Louis (STL)to

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

One-way

Basic

From
$174
Seen: 5 hrs ago

St. Louis (STL)to

San Antonio (SAT)
Depart: 10/05/2026

One-way

Basic

From
$174
Seen: 9 hrs ago

St. Louis (STL)to

San Antonio (SAT)
Depart: 11/04/2026

One-way

Basic

From
$174
Seen: 23 hrs ago

St. Louis (STL)to

San Antonio (SAT)
Depart: 10/08/2026

One-way

Basic

From
$174
Seen: 16 hrs ago

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Explore flights from St. Louis to San Antonio

Sep 2026
From$280*
Seen: 8 hrs ago
One Way/Basic
Oct 2026
From$174*
Seen: 11 hrs ago
One Way/Basic
Nov 2026
From$174*
Seen: 6 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $174
cmp-daily-histogram-bars-legend-max-price-aria-label $519
Displaying fares for September-2026
  • STL–SAT, 09/11/2026: From $519
    11

    Fri

    SEP

  • STL–SAT: cmp-view-offers-disclaimer. Find Offers
    12

    Sat

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

    Sun

  • STL–SAT, 09/14/2026: From $519
    14

    Mon

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

    Tue

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

    Wed

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

    Thu

  • STL–SAT: cmp-view-offers-disclaimer. Find Offers
    18

    Fri

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

    Sat

  • STL–SAT, 09/20/2026: From $455
    20

    Sun

  • STL–SAT, 09/21/2026: From $455
    21

    Mon

  • STL–SAT: cmp-view-offers-disclaimer. Find Offers
    22

    Tue

  • STL–SAT, 09/23/2026: From $455
    23

    Wed

  • STL–SAT, 09/24/2026: From $280
    24

    Thu

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

    Fri

  • STL–SAT, 09/26/2026: From $280
    26

    Sat

  • STL–SAT, 09/27/2026: From $280
    27

    Sun

  • STL–SAT: cmp-view-offers-disclaimer. Find Offers
    28

    Mon

  • STL–SAT, 09/29/2026: From $280
    29

    Tue

  • STL–SAT, 09/30/2026: From $280
    30

    Wed

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

    Thu

    OCT

  • STL–SAT, 10/02/2026: From $174
    02

    Fri

  • STL–SAT, 10/03/2026: From $184
    03

    Sat

  • STL–SAT, 10/04/2026: From $246
    04

    Sun

  • STL–SAT, 10/05/2026: From $174
    05

    Mon

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

    Tue

  • STL–SAT, 10/07/2026: From $174
    07

    Wed

  • STL–SAT, 10/08/2026: From $174
    08

    Thu

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

    Fri

  • STL–SAT: cmp-view-offers-disclaimer. Find Offers
    10

    Sat

    • Range$174-$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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