Southwest® flights from St. Louis to Washington D.C. Reagan National from $109

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

$

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 12/12/2026

One-way

Basic

From
$109
Seen: 23 hrs ago

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 11/10/2026

One-way

Basic

From
$109
Seen: 23 hrs ago

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 12/14/2026

One-way

Basic

From
$109
Seen: 22 hrs ago

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 10/22/2026

One-way

Basic

From
$109
Seen: 22 hrs ago

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 10/01/2026

One-way

Basic

From
$109
Seen: 9 hrs ago

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 10/26/2026

One-way

Basic

From
$109
Seen: 12 hrs ago

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

Sep 2026
From$243*
Seen: 8 hrs ago
One Way/Basic
Oct 2026
From$109*
Seen: 8 hrs ago
One Way/Basic
Nov 2026
From$109*
Seen: 4 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $109
cmp-daily-histogram-bars-legend-max-price-aria-label $272
Displaying fares for September-2026
  • STL–DCA, 09/11/2026: From $272
    11

    Fri

    SEP

  • STL–DCA, 09/12/2026: From $243
    12

    Sat

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

    Sun

  • STL–DCA, 09/14/2026: From $272
    14

    Mon

  • STL–DCA, 09/15/2026: From $243
    15

    Tue

  • STL–DCA, 09/16/2026: From $243
    16

    Wed

  • STL–DCA, 09/17/2026: From $272
    17

    Thu

  • STL–DCA, 09/18/2026: From $272
    18

    Fri

  • STL–DCA, 09/19/2026: From $243
    19

    Sat

  • STL–DCA, 09/20/2026: From $272
    20

    Sun

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

    Mon

  • STL–DCA, 09/22/2026: From $253
    22

    Tue

  • STL–DCA: cmp-view-offers-disclaimer. Find Offers
    23

    Wed

  • STL–DCA, 09/24/2026: From $260
    24

    Thu

  • STL–DCA, 09/25/2026: From $260
    25

    Fri

  • STL–DCA, 09/26/2026: From $243
    26

    Sat

  • STL–DCA, 09/27/2026: From $270
    27

    Sun

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

    Mon

  • STL–DCA, 09/29/2026: From $243
    29

    Tue

  • STL–DCA, 09/30/2026: From $253
    30

    Wed

  • STL–DCA, 10/01/2026: From $109
    01

    Thu

    OCT

  • STL–DCA, 10/02/2026: From $138
    02

    Fri

  • STL–DCA, 10/03/2026: From $109
    03

    Sat

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

    Sun

  • STL–DCA, 10/05/2026: From $109
    05

    Mon

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

    Tue

  • STL–DCA, 10/07/2026: From $109
    07

    Wed

  • STL–DCA, 10/08/2026: From $119
    08

    Thu

  • STL–DCA, 10/09/2026: From $138
    09

    Fri

  • STL–DCA, 10/10/2026: From $147
    10

    Sat

    • Range$109-$272

    *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:
    Ronald Reagan National Airport
    Average flight time:
    1 hour 59 minutes
    Distance:
    719 miles

    Route Information

    142† 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 St. Louis to Washington, D.C. (Reagan National) is 1 hour 59 minutes.
    There are 142 weekly flights from St. Louis to Washington, D.C. (Reagan National) on Southwest Airlines.
    Yes, Southwest flies nonstop from St. Louis to Washington, D.C. (Reagan National) 4 times per day from Monday through Friday.
    Yes, Southwest flies nonstop from St. Louis to Washington, D.C. (Reagan National) 3 times per day on Saturdays and 4 times per day on Sundays.
    To find the lowest fares by day and time to fly St. Louis to Washington, D.C. (Reagan National) with Southwest, check out our Low Fare Calendar.
    You can rent a car at Ronald Reagan National Airport book yours with your flight.
    Yes! Flights from St. Louis to Washington, D.C. (Reagan National)—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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