American Airlines flights from Saint Louis to Philadelphia

Recent searches for flights from Saint Louis to Philadelphia

Sep 2026
From$405*
Updated: 5 hours ago
Round tripIEconomy
Oct 2026
From$309*
Updated: 3 hours ago
Round tripIEconomy
Nov 2026
From$405*
Updated: 15 hours ago
Round tripIEconomy
cmp-daily-histogram-bars-legend-min-price-aria-label $405
cmp-daily-histogram-bars-legend-max-price-aria-label $657
Displaying fares for September-2026
  • STL–PHL: cmp-view-offers-disclaimer. Find Offers
    07

    Mo

    SEP

  • STL–PHL, 09/08/26 – 09/15/26: From $587
    08

    Tu

  • STL–PHL, 09/09/26 – 09/16/26: From $587
    09

    We

  • STL–PHL, 09/10/26 – 09/17/26: From $657
    10

    Th

  • STL–PHL, 09/11/26 – 09/18/26: From $657
    11

    Fr

  • STL–PHL, 09/12/26 – 09/19/26: From $587
    12

    Sa

  • STL–PHL, 09/13/26 – 09/20/26: From $657
    13

    Su

  • STL–PHL, 09/14/26 – 09/21/26: From $639
    14

    Mo

  • STL–PHL, 09/15/26 – 09/22/26: From $587
    15

    Tu

  • STL–PHL, 09/16/26 – 09/23/26: From $587
    16

    We

  • STL–PHL, 09/17/26 – 09/24/26: From $639
    17

    Th

  • STL–PHL, 09/18/26 – 09/25/26: From $639
    18

    Fr

  • STL–PHL, 09/19/26 – 09/26/26: From $587
    19

    Sa

  • STL–PHL, 09/20/26 – 09/27/26: From $639
    20

    Su

  • STL–PHL, 09/21/26 – 09/28/26: From $553
    21

    Mo

  • STL–PHL, 09/22/26 – 09/29/26: From $536
    22

    Tu

  • STL–PHL, 09/23/26 – 09/30/26: From $536
    23

    We

  • STL–PHL, 09/24/26 – 10/01/26: From $553
    24

    Th

  • STL–PHL, 09/25/26 – 10/02/26: From $553
    25

    Fr

  • STL–PHL, 09/26/26 – 10/03/26: From $536
    26

    Sa

  • STL–PHL, 09/27/26 – 10/04/26: From $585
    27

    Su

  • STL–PHL, 09/28/26 – 10/05/26: From $405
    28

    Mo

  • STL–PHL, 09/29/26 – 10/06/26: From $405
    29

    Tu

  • STL–PHL, 09/30/26 – 10/07/26: From $405
    30

    We

  • STL–PHL, 10/01/26 – 10/08/26: From $405
    01

    Th

    OCT

  • STL–PHL, 10/02/26 – 10/09/26: From $405
    02

    Fr

  • STL–PHL, 10/03/26 – 10/10/26: From $405
    03

    Sa

  • STL–PHL, 10/04/26 – 10/11/26: From $509
    04

    Su

  • STL–PHL: cmp-view-offers-disclaimer. Find Offers
    05

    Mo

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

    Tu

    • range$405-$657

    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 Philadelphia flights

    $
    keyboard_arrow_down

    Saint Louis (STL)to

    Philadelphia (PHL)
    10/22/26 - 10/23/26

    Round trip

    Economy

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

    Saint Louis (STL)to

    Philadelphia (PHL)
    10/13/26 - 10/20/26

    Round trip

    Economy

    from
    $405Fare subject to changes
    Updated: 5 hours ago

    Saint Louis (STL)to

    Philadelphia (PHL)
    10/16/26 - 10/23/26

    Round trip

    Economy

    from
    $405Fare subject to changes
    Updated: 5 hours ago

    Saint Louis (STL)to

    Philadelphia (PHL)
    10/17/26 - 10/24/26

    Round trip

    Economy

    from
    $405Fare subject to changes
    Updated: 5 hours ago

    Saint Louis (STL)to

    Philadelphia (PHL)
    10/22/26 - 10/29/26

    Round trip

    Economy

    from
    $405Fare subject to changes
    Updated: 5 hours ago

    Saint Louis (STL)to

    Philadelphia (PHL)
    10/28/26 - 11/04/26

    Round trip

    Economy

    from
    $405Fare subject to changes
    Updated: 5 hours ago

    Saint Louis (STL)to

    Philadelphia (PHL)
    10/31/26 - 11/07/26

    Round trip

    Economy

    from
    $405Fare subject to changes
    Updated: 5 hours ago

    Saint Louis (STL)to

    Philadelphia (PHL)
    10/01/26 - 10/08/26

    Round trip

    Economy

    from
    $405Fare subject to changes
    Updated: 5 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 Saint Louis to Philadelphia

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

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    American Airlines flights from Saint Louis to Philadelphia