Southwest® flights from Kansas City to St. Louis from $139

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Low fares from Kansas City to St. Louis

$

Kansas City (MCI)to

St. Louis (STL)
Depart: 10/17/2026

One-way

Basic

From
$139
Seen: 8 hrs ago

Kansas City (MCI)to

St. Louis (STL)
Depart: 09/22/2026

One-way

Basic

From
$139
Seen: 10 hrs ago

Kansas City (MCI)to

St. Louis (STL)
Depart: 10/12/2026

One-way

Basic

From
$139
Seen: 9 hrs ago

Kansas City (MCI)to

St. Louis (STL)
Depart: 09/15/2026

One-way

Basic

From
$139
Seen: 8 hrs ago

Kansas City (MCI)to

St. Louis (STL)
Depart: 10/22/2026

One-way

Basic

From
$139
Seen: 3 hrs ago

Kansas City (MCI)to

St. Louis (STL)
Depart: 09/29/2026

One-way

Basic

From
$139
Seen: 2 hrs ago

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Explore flights from Kansas City to St. Louis

Aug 2026
From$372*
Seen: 23 hrs ago
One Way/Basic
Sep 2026
From$139*
Seen: 9 hrs ago
One Way/Basic
Oct 2026
From$139*
Seen: 9 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $139
cmp-daily-histogram-bars-legend-max-price-aria-label $433
Displaying fares for August-2026
  • MCI–STL, 08/22/2026: From $433
    22

    Sat

    AUG

  • MCI–STL, 08/23/2026: From $433
    23

    Sun

  • MCI–STL, 08/24/2026: From $433
    24

    Mon

  • MCI–STL, 08/25/2026: From $433
    25

    Tue

  • MCI–STL, 08/26/2026: From $433
    26

    Wed

  • MCI–STL, 08/27/2026: From $433
    27

    Thu

  • MCI–STL, 08/28/2026: From $372
    28

    Fri

  • MCI–STL, 08/29/2026: From $372
    29

    Sat

  • MCI–STL, 08/30/2026: From $372
    30

    Sun

  • MCI–STL, 08/31/2026: From $372
    31

    Mon

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

    Tue

    SEP

  • MCI–STL: cmp-view-offers-disclaimer. Find Offers
    02

    Wed

  • MCI–STL, 09/03/2026: From $242
    03

    Thu

  • MCI–STL, 09/04/2026: From $242
    04

    Fri

  • MCI–STL, 09/05/2026: From $242
    05

    Sat

  • MCI–STL, 09/06/2026: From $242
    06

    Sun

  • MCI–STL, 09/07/2026: From $242
    07

    Mon

  • MCI–STL: cmp-view-offers-disclaimer. Find Offers
    08

    Tue

  • MCI–STL, 09/09/2026: From $242
    09

    Wed

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

    Thu

  • MCI–STL, 09/11/2026: From $147
    11

    Fri

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

    Sat

  • MCI–STL, 09/13/2026: From $184
    13

    Sun

  • MCI–STL: cmp-view-offers-disclaimer. Find Offers
    14

    Mon

  • MCI–STL, 09/15/2026: From $139
    15

    Tue

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

    Wed

  • MCI–STL, 09/17/2026: From $164
    17

    Thu

  • MCI–STL, 09/18/2026: From $147
    18

    Fri

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

    Sat

  • MCI–STL, 09/20/2026: From $184
    20

    Sun

  • MCI–STL: cmp-view-offers-disclaimer. Find Offers
    21

    Mon

    • Range$139-$433

    *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:
    Kansas City International Airport
    Arriving at:
    Lambert-St Louis Int'l Airport
    Average flight time:
    1 hour 3 minutes
    Distance:
    237 miles

    Route Information

    156† Weekly flights
    • 3‡ Nonstop flights per day Monday through Friday
    • 2‡ Nonstop flights on Saturday
    • 3‡ 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 Kansas City to St. Louis is 1 hour 3 minutes.
    There are 156 weekly flights from Kansas City to St. Louis on Southwest Airlines.
    Yes, Southwest flies nonstop from Kansas City to St. Louis 3 times per day from Monday through Friday.
    Yes, Southwest flies nonstop from Kansas City to St. Louis 2 times per day on Saturdays and 3 times per day on Sundays.
    To find the lowest fares by day and time to fly Kansas City 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 Kansas City 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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