American Airlines flights from Saint Louis to Washington, D.C.

Recent searches for flights from Saint Louis to Washington, D.C.

Aug 2026
From$279*
Updated: 2 hours ago
Round tripIEconomy
Sep 2026
From$279*
Updated: 2 hours ago
Round tripIEconomy
Oct 2026
From$279*
Updated: 2 hours ago
Round tripIEconomy
cmp-daily-histogram-bars-legend-min-price-aria-label $279
cmp-daily-histogram-bars-legend-max-price-aria-label $518
Displaying fares for August-2026
  • STL–IAD, 08/04/26 – 08/11/26: From $485
    04

    Tu

    AUG

  • STL–WAS, 08/05/26 – 08/12/26: From $445
    05

    We

  • STL–WAS, 08/06/26 – 08/13/26: From $518
    06

    Th

  • STL–WAS, 08/07/26 – 08/14/26: From $473
    07

    Fr

  • STL–WAS, 08/08/26 – 08/15/26: From $465
    08

    Sa

  • STL–WAS, 08/09/26 – 08/16/26: From $473
    09

    Su

  • STL–WAS, 08/10/26 – 08/17/26: From $473
    10

    Mo

  • STL–WAS, 08/11/26 – 08/18/26: From $445
    11

    Tu

  • STL–WAS, 08/12/26 – 08/19/26: From $445
    12

    We

  • STL–WAS, 08/13/26 – 08/20/26: From $473
    13

    Th

  • STL–WAS, 08/14/26 – 08/21/26: From $473
    14

    Fr

  • STL–DCA, 08/15/26 – 08/22/26: From $465
    15

    Sa

  • STL–WAS, 08/16/26 – 08/23/26: From $473
    16

    Su

  • STL–WAS, 08/17/26 – 08/24/26: From $473
    17

    Mo

  • STL–DCA, 08/18/26 – 08/25/26: From $372
    18

    Tu

  • STL–DCA, 08/19/26 – 08/26/26: From $372
    19

    We

  • STL–DCA, 08/20/26 – 08/27/26: From $389
    20

    Th

  • STL–WAS, 08/21/26 – 08/28/26: From $417
    21

    Fr

  • STL–WAS, 08/22/26 – 08/29/26: From $372
    22

    Sa

  • STL–DCA, 08/23/26 – 08/30/26: From $456
    23

    Su

  • STL–DCA, 08/24/26 – 08/31/26: From $389
    24

    Mo

  • STL–WAS, 08/25/26 – 09/01/26: From $279
    25

    Tu

  • STL–DCA, 08/26/26 – 09/02/26: From $279
    26

    We

  • STL–DCA, 08/27/26 – 09/03/26: From $279
    27

    Th

  • STL–WAS, 08/28/26 – 09/04/26: From $335
    28

    Fr

  • STL–DCA, 08/29/26 – 09/05/26: From $279
    29

    Sa

  • STL–WAS, 08/30/26 – 09/06/26: From $348
    30

    Su

  • STL–WAS, 08/31/26 – 09/07/26: From $289
    31

    Mo

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

    Tu

    SEP

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

    We

  • STL–IAD, 09/03/26 – 09/10/26: From $295
    03

    Th

    • range$279-$518

    DisclaimerFares displayed have been collected within the last 24hrs and may no longer be available at time of booking. Modifying this information may result in a different fare. To find the most updated fare, please visit aa.com. Fares listed may be Basic Economy, which class is subject to additional terms and conditions. Additional baggage fees and charges for optional products and services may apply.

    Find deals on Saint Louis to Washington, D.C. flights

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    Saint Louis (STL)to

    Washington, D.C. (WAS)
    10/07/26 - 10/14/26

    Round trip

    Economy

    from
    $279Fare subject to changes
    Updated: 17 minutes ago

    Saint Louis (STL)to

    Washington, D.C. (WAS)
    10/08/26 - 10/15/26

    Round trip

    Economy

    from
    $279Fare subject to changes
    Updated: 17 minutes ago

    Saint Louis (STL)to

    Washington, D.C. (WAS)
    10/19/26 - 10/26/26

    Round trip

    Economy

    from
    $279Fare subject to changes
    Updated: 17 minutes ago

    Saint Louis (STL)to

    Washington, D.C. (WAS)
    10/20/26 - 10/27/26

    Round trip

    Economy

    from
    $279Fare subject to changes
    Updated: 17 minutes ago

    Saint Louis (STL)to

    Washington, D.C. (WAS)
    10/24/26 - 10/31/26

    Round trip

    Economy

    from
    $279Fare subject to changes
    Updated: 17 minutes ago

    Saint Louis (STL)to

    Washington, D.C. (WAS)
    10/26/26 - 11/02/26

    Round trip

    Economy

    from
    $279Fare subject to changes
    Updated: 17 minutes ago

    Saint Louis (STL)to

    Washington, D.C. (WAS)
    10/28/26 - 11/04/26

    Round trip

    Economy

    from
    $279Fare subject to changes
    Updated: 17 minutes ago

    Saint Louis (STL)to

    Washington, D.C. (WAS)
    09/16/26 - 09/23/26

    Round trip

    Economy

    from
    $279Fare subject to changes
    Updated: 17 minutes ago

    *Fares displayed have been collected within the last 24hrs and may no longer be available at time of booking. Some fares listed may include one or more connections that are Basic Economy, which class is subject to additional terms and conditions. Modifying this information may result in a different fare. To find the most updated fare, please visit aa.com. Additional baggage fees and charges for optional products and services may apply.

    Finding cheap flights from Saint Louis to Washington, D.C.

    Looking for lower fares on your trip from Saint Louis to Washington, D.C.? Here are a few ways to save.

    • Book early: Booking 1 to 3 months ahead can help you find lower fares
    • Be flexible with dates: Midweek travel, like Tuesdays and Wednesdays, can be more affordable
    • Travel during less busy periods: Flying outside peak travel times can help find lower fares and avoid crowds

    Earn up to $500 back on your next American Airlines flight plus, 30,000 bonus miles. Offers vary elsewhere. Opens another site in a new window that may not meet accessibility guidelines.

    Upgrade your flight with Main Cabin Extra

    Make your trip more comfortable with Main Cabin Extra. Enjoy benefits like:

    • Extra legroom: More space with seats at the front of the Main Cabin or in exit rows.
    • Early boarding: Preferred Group 5 boarding allows easier access to overhead bins.
    • Complimentary drinks: Enjoy beer, wine and spirits on flights with full beverage service.

    Discover how Main Cabin Extra can enhance your trip.

    American Airlines flights from Saint Louis to Washington, D.C.