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

Promo Code

Low fares from Baltimore/Washington to St. Louis

$

Baltimore/Washington (BWI)to

St. Louis (STL)
Depart: 11/18/2026

One-way

Basic

From
$133
Seen: 11 hrs ago

Baltimore/Washington (BWI)to

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

One-way

Basic

From
$133
Seen: 3 hrs ago

Baltimore/Washington (BWI)to

St. Louis (STL)
Depart: 11/12/2026

One-way

Basic

From
$138
Seen: 15 hrs ago

Baltimore/Washington (BWI)to

St. Louis (STL)
Depart: 01/07/2027

One-way

Basic

From
$138
Seen: 20 hrs ago

Baltimore/Washington (BWI)to

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

One-way

Choice

From
$173
Seen: 7 hrs ago

Baltimore/Washington (BWI)to

St. Louis (STL)
Depart: 11/18/2026

One-way

Choice

From
$173
Seen: 11 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 Baltimore/Washington to St. Louis

Sep 2026
From$516*
Seen: 35 minutes ago
One Way/Basic
Oct 2026
From$173*
Seen: 7 hrs ago
One Way/Basic
Nov 2026
From$133*
Seen: 3 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $173
cmp-daily-histogram-bars-legend-max-price-aria-label $516
Displaying fares for September-2026
  • BWI–STL, 09/30/2026: From $516
    30

    Wed

    SEP

  • BWI–STL, 10/01/2026: From $516
    01

    Thu

  • BWI–STL, 10/02/2026: From $511
    02

    Fri

  • BWI–STL, 10/03/2026: From $511
    03

    Sat

  • BWI–STL, 10/04/2026: From $511
    04

    Sun

  • BWI–STL, 10/05/2026: From $511
    05

    Mon

  • BWI–STL, 10/06/2026: From $416
    06

    Tue

  • BWI–STL: cmp-view-offers-disclaimer. Find Offers
    07

    Wed

  • BWI–STL, 10/08/2026: From $416
    08

    Thu

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

    Fri

  • BWI–STL, 10/10/2026: From $416
    10

    Sat

  • BWI–STL: cmp-view-offers-disclaimer. Find Offers
    11

    Sun

  • BWI–STL, 10/12/2026: From $285
    12

    Mon

  • BWI–STL, 10/13/2026: From $280
    13

    Tue

  • BWI–STL, 10/14/2026: From $280
    14

    Wed

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

    Thu

  • BWI–STL, 10/16/2026: From $280
    16

    Fri

  • BWI–STL, 10/17/2026: From $280
    17

    Sat

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

    Sun

  • BWI–STL, 10/19/2026: From $178
    19

    Mon

  • BWI–STL, 10/20/2026: From $179
    20

    Tue

  • BWI–STL, 10/21/2026: From $173
    21

    Wed

  • BWI–STL, 10/22/2026: From $179
    22

    Thu

  • BWI–STL, 10/23/2026: From $193
    23

    Fri

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

    Sat

  • BWI–STL, 10/25/2026: From $214
    25

    Sun

  • BWI–STL, 10/26/2026: From $179
    26

    Mon

  • BWI–STL: cmp-view-offers-disclaimer. Find Offers
    27

    Tue

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

    Wed

  • BWI–STL, 10/29/2026: From $179
    29

    Thu

    • Range$173-$516

    *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.

    Explore Flights from Other Popular Origins

    Popular Flights from Baltimore/Washington