Southwest® flights from Washington D.C. Reagan National to St. Louis from $128

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Low fares from Washington D.C. Reagan National to St. Louis

$

Washington D.C. Reagan National (DCA)to

St. Louis (STL)
Depart: 11/10/2026

One-way

Basic

From
$128
Seen: 21 hrs ago

Washington D.C. Reagan National (DCA)to

St. Louis (STL)
Depart: 12/29/2026

One-way

Basic

From
$128
Seen: 13 hrs ago

Washington D.C. Reagan National (DCA)to

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

One-way

Basic

From
$128
Seen: 15 hrs ago

Washington D.C. Reagan National (DCA)to

St. Louis (STL)
Depart: 12/22/2026

One-way

Basic

From
$128
Seen: 8 hrs ago

Washington D.C. Reagan National (DCA)to

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

One-way

Basic

From
$128
Seen: 7 hrs ago

Washington D.C. Reagan National (DCA)to

St. Louis (STL)
Depart: 11/21/2026

One-way

Basic

From
$128
Seen: 11 hrs ago

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Explore flights from Washington D.C. Reagan National to St. Louis

Oct 2026
From$168*
Seen: 13 hrs ago
One Way/Basic
Nov 2026
From$128*
Seen: 22 hrs ago
One Way/Basic
Dec 2026
From$128*
Seen: 12 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $128
cmp-daily-histogram-bars-legend-max-price-aria-label $324
Displaying fares for October-2026
  • DCA–STL, 10/03/2026: From $253
    03

    Sat

    OCT

  • DCA–STL: cmp-view-offers-disclaimer. Find Offers
    04

    Sun

  • DCA–STL, 10/05/2026: From $282
    05

    Mon

  • DCA–STL, 10/06/2026: From $253
    06

    Tue

  • DCA–STL, 10/07/2026: From $253
    07

    Wed

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

    Thu

  • DCA–STL, 10/09/2026: From $324
    09

    Fri

  • DCA–STL, 10/10/2026: From $253
    10

    Sat

  • DCA–STL, 10/11/2026: From $282
    11

    Sun

  • DCA–STL, 10/12/2026: From $282
    12

    Mon

  • DCA–STL, 10/13/2026: From $253
    13

    Tue

  • DCA–STL, 10/14/2026: From $253
    14

    Wed

  • DCA–STL, 10/15/2026: From $282
    15

    Thu

  • DCA–STL, 10/16/2026: From $282
    16

    Fri

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

    Sat

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

    Sun

  • DCA–STL, 10/19/2026: From $270
    19

    Mon

  • DCA–STL: cmp-view-offers-disclaimer. Find Offers
    20

    Tue

  • DCA–STL, 10/21/2026: From $253
    21

    Wed

  • DCA–STL, 10/22/2026: From $270
    22

    Thu

  • DCA–STL, 10/23/2026: From $270
    23

    Fri

  • DCA–STL, 10/24/2026: From $168
    24

    Sat

  • DCA–STL, 10/25/2026: From $204
    25

    Sun

  • DCA–STL, 10/26/2026: From $168
    26

    Mon

  • DCA–STL, 10/27/2026: From $168
    27

    Tue

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

    Wed

  • DCA–STL, 10/29/2026: From $168
    29

    Thu

  • DCA–STL, 10/30/2026: From $174
    30

    Fri

  • DCA–STL, 10/31/2026: From $168
    31

    Sat

  • DCA–STL, 11/01/2026: From $194
    01

    Sun

    NOV

  • DCA–STL, 11/02/2026: From $128
    02

    Mon

    • Range$128-$324

    *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:
    Ronald Reagan National Airport
    Arriving at:
    Lambert-St Louis Int'l Airport
    Average flight time:
    2 hours 16 minutes
    Distance:
    719 miles

    Route Information

    156† Weekly flights
    • 4‡ 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 Washington, D.C. (Reagan National) to St. Louis is 2 hours 16 minutes.
    There are 156 weekly flights from Washington, D.C. (Reagan National) to St. Louis on Southwest Airlines.
    Yes, Southwest flies nonstop from Washington, D.C. (Reagan National) to St. Louis 4 times per day from Monday through Friday.
    Yes, Southwest flies nonstop from Washington, D.C. (Reagan National) 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 Washington, D.C. (Reagan National) 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 Washington, D.C. (Reagan National) 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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