Southwest® flights from Baltimore/Washington to St. Louis from $133

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Low fares from Baltimore/Washington to St. Louis

$

Baltimore/Washington (BWI)to

St. Louis (STL)
Depart: 11/02/2026

One-way

Basic

From
$133
Seen: 9 hrs ago

Baltimore/Washington (BWI)to

St. Louis (STL)
Depart: 10/03/2026

One-way

Basic

From
$133
Seen: 8 hrs ago

Baltimore/Washington (BWI)to

St. Louis (STL)
Depart: 10/14/2026

One-way

Basic

From
$133
Seen: 12 hrs ago

Baltimore/Washington (BWI)to

St. Louis (STL)
Depart: 11/03/2026

One-way

Basic

From
$133
Seen: 16 hrs ago

Baltimore/Washington (BWI)to

St. Louis (STL)
Depart: 11/04/2026

One-way

Basic

From
$133
Seen: 23 hrs ago

Baltimore/Washington (BWI)to

St. Louis (STL)
Depart: 10/06/2026

One-way

Basic

From
$133
Seen: 5 hrs ago

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Explore flights from Baltimore/Washington to St. Louis

Aug 2026
From$406*
Seen: 2 hrs ago
One Way/Basic
Sep 2026
From$138*
Seen: 12 hrs ago
One Way/Basic
Oct 2026
From$133*
Seen: 1 hour ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $138
cmp-daily-histogram-bars-legend-max-price-aria-label $506
Displaying fares for August-2026
  • BWI–STL, 08/21/2026: From $506
    21

    Fri

    AUG

  • BWI–STL, 08/22/2026: From $501
    22

    Sat

  • BWI–STL, 08/23/2026: From $501
    23

    Sun

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

    Mon

  • BWI–STL, 08/25/2026: From $506
    25

    Tue

  • BWI–STL, 08/26/2026: From $506
    26

    Wed

  • BWI–STL, 08/27/2026: From $411
    27

    Thu

  • BWI–STL, 08/28/2026: From $411
    28

    Fri

  • BWI–STL, 08/29/2026: From $406
    29

    Sat

  • BWI–STL, 08/30/2026: From $406
    30

    Sun

  • BWI–STL, 08/31/2026: From $406
    31

    Mon

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

    Tue

    SEP

  • BWI–STL, 09/02/2026: From $411
    02

    Wed

  • BWI–STL, 09/03/2026: From $275
    03

    Thu

  • BWI–STL, 09/04/2026: From $275
    04

    Fri

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

    Sat

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

    Sun

  • BWI–STL, 09/07/2026: From $275
    07

    Mon

  • BWI–STL, 09/08/2026: From $275
    08

    Tue

  • BWI–STL, 09/09/2026: From $275
    09

    Wed

  • BWI–STL, 09/10/2026: From $148
    10

    Thu

  • BWI–STL, 09/11/2026: From $174
    11

    Fri

  • BWI–STL, 09/12/2026: From $143
    12

    Sat

  • BWI–STL, 09/13/2026: From $234
    13

    Sun

  • BWI–STL, 09/14/2026: From $148
    14

    Mon

  • BWI–STL, 09/15/2026: From $148
    15

    Tue

  • BWI–STL, 09/16/2026: From $148
    16

    Wed

  • BWI–STL, 09/17/2026: From $148
    17

    Thu

  • BWI–STL, 09/18/2026: From $174
    18

    Fri

  • BWI–STL, 09/19/2026: From $138
    19

    Sat

  • BWI–STL, 09/20/2026: From $194
    20

    Sun

    • Range$138-$506

    *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:
    Balt./Wash. International Airport
    Arriving at:
    Lambert-St Louis Int'l Airport
    Average flight time:
    2 hours 17 minutes
    Distance:
    738 miles

    Route Information

    156† Weekly flights
    • 3‡ Nonstop flights per day Monday through Friday
    • 3‡ Nonstop flights on Saturday
    • 4‡ Nonstop flights 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 Baltimore/Washington to St. Louis is 2 hours 17 minutes.
    There are 156 weekly flights from Baltimore/Washington to St. Louis on Southwest Airlines.
    Yes, Southwest flies nonstop from Baltimore/Washington to St. Louis 3 times per day from Monday through Friday.
    Yes, Southwest flies nonstop from Baltimore/Washington to St. Louis 3 times per day on Saturdays and 4 times per day on Sundays.
    To find the lowest fares by day and time to fly Baltimore/Washington to St. Louis with Southwest, check out our Low Fare Calendar.
    You can rent a car at Lambert-St Louis Int'l Airport book yours with your flight.
    Yes! Flights from Baltimore/Washington to St. Louis—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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