American Airlines flights from Philadelphia to Saint Louis

Recent searches for flights from Philadelphia to Saint Louis

Aug 2026
From$303*
Updated: 3 hours ago
Round tripIEconomy
Sep 2026
From$293*
Updated: 23 hours ago
Round tripIEconomy
Oct 2026
From$309*
Updated: 3 hours ago
Round tripIEconomy
cmp-daily-histogram-bars-legend-min-price-aria-label $293
cmp-daily-histogram-bars-legend-max-price-aria-label $637
Displaying fares for August-2026
  • PHL–STL, 08/06/26 – 08/08/26: From $602
    06

    Th

    AUG

  • PHL–STL, 08/07/26 – 08/08/26: From $602
    07

    Fr

  • PHL–STL, 08/08/26 – 08/15/26: From $567
    08

    Sa

  • PHL–STL, 08/09/26 – 08/16/26: From $637
    09

    Su

  • PHL–STL, 08/10/26 – 08/12/26: From $602
    10

    Mo

  • PHL–STL, 08/11/26 – 08/18/26: From $567
    11

    Tu

  • PHL–STL, 08/12/26 – 08/19/26: From $567
    12

    We

  • PHL–STL, 08/13/26 – 08/20/26: From $619
    13

    Th

  • PHL–STL, 08/14/26 – 08/18/26: From $602
    14

    Fr

  • PHL–STL, 08/15/26 – 08/22/26: From $567
    15

    Sa

  • PHL–STL, 08/16/26 – 08/23/26: From $619
    16

    Su

  • PHL–STL, 08/17/26 – 08/20/26: From $439
    17

    Mo

  • PHL–STL, 08/18/26 – 08/20/26: From $439
    18

    Tu

  • PHL–STL, 08/19/26 – 08/26/26: From $567
    19

    We

  • PHL–STL, 08/20/26 – 08/27/26: From $473
    20

    Th

  • PHL–STL, 08/21/26 – 08/28/26: From $518
    21

    Fr

  • PHL–STL, 08/22/26 – 08/29/26: From $438
    22

    Sa

  • PHL–STL, 08/23/26 – 08/30/26: From $563
    23

    Su

  • PHL–STL, 08/24/26 – 08/31/26: From $473
    24

    Mo

  • PHL–STL, 08/25/26 – 09/01/26: From $438
    25

    Tu

  • PHL–STL, 08/26/26 – 09/02/26: From $438
    26

    We

  • PHL–STL, 08/27/26 – 09/03/26: From $309
    27

    Th

  • PHL–STL, 08/28/26 – 09/04/26: From $399
    28

    Fr

  • PHL–STL, 08/29/26 – 09/05/26: From $303
    29

    Sa

  • PHL–STL, 08/30/26 – 09/06/26: From $383
    30

    Su

  • PHL–STL, 08/31/26 – 09/07/26: From $309
    31

    Mo

  • PHL–STL, 09/01/26 – 09/08/26: From $309
    01

    Tu

    SEP

  • PHL–STL, 09/02/26 – 09/09/26: From $309
    02

    We

  • PHL–STL: cmp-view-offers-disclaimer. Find Offers
    03

    Th

  • PHL–STL, 09/04/26 – 09/06/26: From $338
    04

    Fr

  • PHL–STL, 09/05/26 – 09/12/26: From $293
    05

    Sa

    • range$293-$637

    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 Philadelphia to Saint Louis flights

    $
    keyboard_arrow_down

    Philadelphia (PHL)to

    Saint Louis (STL)
    09/05/26 - 09/12/26

    Round trip

    Economy

    from
    $293Fare subject to changes
    Updated: 23 hours ago

    Philadelphia (PHL)to

    Saint Louis (STL)
    09/11/26 - 09/14/26

    Round trip

    Economy

    from
    $293Fare subject to changes
    Updated: 2 hours ago

    Philadelphia (PHL)to

    Saint Louis (STL)
    08/29/26 - 09/05/26

    Round trip

    Economy

    from
    $303Fare subject to changes
    Updated: 3 hours ago

    Philadelphia (PHL)to

    Saint Louis (STL)
    10/17/26 - 10/24/26

    Round trip

    Economy

    from
    $309Fare subject to changes
    Updated: 3 hours ago

    Philadelphia (PHL)to

    Saint Louis (STL)
    10/20/26 - 10/27/26

    Round trip

    Economy

    from
    $309Fare subject to changes
    Updated: 3 hours ago

    Philadelphia (PHL)to

    Saint Louis (STL)
    10/21/26 - 10/28/26

    Round trip

    Economy

    from
    $309Fare subject to changes
    Updated: 3 hours ago

    Philadelphia (PHL)to

    Saint Louis (STL)
    10/22/26 - 10/29/26

    Round trip

    Economy

    from
    $309Fare subject to changes
    Updated: 3 hours ago

    Philadelphia (PHL)to

    Saint Louis (STL)
    09/07/26 - 09/14/26

    Round trip

    Economy

    from
    $309Fare subject to changes
    Updated: 3 hours 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 Philadelphia to Saint Louis

    Looking for lower fares on your trip from Philadelphia to Saint Louis? 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 Philadelphia to Saint Louis