Southwest® flights from St. Louis to Washington D.C. Reagan National from $135

Promo Code

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

$

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 01/09/2027

One-way

Basic

From
$135
Seen: 19 hrs ago

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 12/02/2026

One-way

Basic

From
$135
Seen: 10 hrs ago

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 12/15/2026

One-way

Basic

From
$135
Seen: 16 hrs ago

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 01/30/2027

One-way

Basic

From
$135
Seen: 16 hrs ago

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 12/16/2026

One-way

Basic

From
$135
Seen: 13 hrs ago

St. Louis (STL)to

Washington D.C. Reagan National (DCA)
Depart: 02/13/2027

One-way

Basic

From
$135
Seen: 8 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 St. Louis to Washington D.C. Reagan National

Nov 2026
From$268*
Seen: 20 hrs ago
One Way/Basic
Dec 2026
From$135*
Seen: 13 hrs ago
One Way/Basic
Jan 2027
From$135*
Seen: 28 minutes ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $135
cmp-daily-histogram-bars-legend-max-price-aria-label $383
Displaying fares for November-2026
  • STL–DCA, 11/12/2026: From $297
    12

    Thu

    NOV

  • STL–DCA, 11/13/2026: From $297
    13

    Fri

  • STL–DCA, 11/14/2026: From $268
    14

    Sat

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

    Sun

  • STL–DCA, 11/16/2026: From $297
    16

    Mon

  • STL–DCA, 11/17/2026: From $268
    17

    Tue

  • STL–DCA, 11/18/2026: From $268
    18

    Wed

  • STL–DCA, 11/19/2026: From $297
    19

    Thu

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

    Fri

  • STL–DCA, 11/21/2026: From $268
    21

    Sat

  • STL–DCA: cmp-view-offers-disclaimer. Find Offers
    22

    Sun

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

    Mon

  • STL–DCA, 11/24/2026: From $268
    24

    Tue

  • STL–DCA, 11/25/2026: From $268
    25

    Wed

  • STL–DCA: cmp-view-offers-disclaimer. Find Offers
    26

    Thu

  • STL–DCA, 11/27/2026: From $285
    27

    Fri

  • STL–DCA, 11/28/2026: From $325
    28

    Sat

  • STL–DCA, 11/29/2026: From $383
    29

    Sun

  • STL–DCA, 11/30/2026: From $297
    30

    Mon

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

    Tue

    DEC

  • STL–DCA, 12/02/2026: From $135
    02

    Wed

  • STL–DCA, 12/03/2026: From $155
    03

    Thu

  • STL–DCA, 12/04/2026: From $170
    04

    Fri

  • STL–DCA, 12/05/2026: From $135
    05

    Sat

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

    Sun

  • STL–DCA, 12/07/2026: From $155
    07

    Mon

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

    Tue

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

    Wed

  • STL–DCA, 12/10/2026: From $155
    10

    Thu

  • STL–DCA, 12/11/2026: From $170
    11

    Fri

    • Range$135-$383

    *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

    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.

    Explore Flights from Other Popular Origins

    Popular Flights from St. Louis