American Airlines flights from Portland, OR to Saint Louis

Recent searches for flights from Portland, OR to Saint Louis

Aug 2026
From$451*
Updated: 9 hours ago
Round tripIEconomy
Sep 2026
From$337*
Updated: 9 hours ago
Round tripIEconomy
Oct 2026
From$337*
Updated: 9 hours ago
Round tripIEconomy
cmp-daily-histogram-bars-legend-min-price-aria-label $353
cmp-daily-histogram-bars-legend-max-price-aria-label $592
Displaying fares for August-2026
  • PDX–STL, 08/25/26 – 09/01/26: From $451
    25

    Tu

    AUG

  • PDX–STL, 08/26/26 – 09/02/26: From $451
    26

    We

  • PDX–STL, 08/27/26 – 09/03/26: From $451
    27

    Th

  • PDX–STL, 08/28/26 – 09/04/26: From $592
    28

    Fr

  • PDX–STL, 08/29/26 – 09/05/26: From $451
    29

    Sa

  • PDX–STL, 08/30/26 – 09/06/26: From $451
    30

    Su

  • PDX–STL, 08/31/26 – 09/07/26: From $451
    31

    Mo

  • PDX–STL, 09/01/26 – 09/08/26: From $451
    01

    Tu

    SEP

  • PDX–STL, 09/02/26 – 09/09/26: From $451
    02

    We

  • PDX–STL, 09/03/26 – 09/10/26: From $451
    03

    Th

  • PDX–STL, 09/04/26 – 09/11/26: From $451
    04

    Fr

  • PDX–STL, 09/05/26 – 09/12/26: From $451
    05

    Sa

  • PDX–STL, 09/06/26 – 09/13/26: From $451
    06

    Su

  • PDX–STL, 09/07/26 – 09/14/26: From $493
    07

    Mo

  • PDX–STL, 09/08/26 – 09/15/26: From $451
    08

    Tu

  • PDX–STL, 09/09/26 – 09/16/26: From $398
    09

    We

  • PDX–STL, 09/10/26 – 09/17/26: From $515
    10

    Th

  • PDX–STL, 09/11/26 – 09/18/26: From $398
    11

    Fr

  • PDX–STL, 09/12/26 – 09/19/26: From $398
    12

    Sa

  • PDX–STL, 09/13/26 – 09/20/26: From $398
    13

    Su

  • PDX–STL, 09/14/26 – 09/21/26: From $369
    14

    Mo

  • PDX–STL, 09/15/26 – 09/22/26: From $369
    15

    Tu

  • PDX–STL, 09/16/26 – 09/23/26: From $353
    16

    We

  • PDX–STL, 09/17/26 – 09/24/26: From $369
    17

    Th

  • PDX–STL, 09/18/26 – 09/25/26: From $369
    18

    Fr

  • PDX–STL, 09/19/26 – 09/26/26: From $353
    19

    Sa

  • PDX–STL, 09/20/26 – 09/27/26: From $369
    20

    Su

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

    Mo

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

    Tu

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

    We

  • PDX–STL, 09/24/26 – 10/01/26: From $398
    24

    Th

    • range$353-$592

    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 Portland, OR to Saint Louis flights

    $
    keyboard_arrow_down

    Portland, OR (PDX)to

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

    Round trip

    Economy

    from
    $337Fare subject to changes
    Updated: 9 hours ago

    Portland, OR (PDX)to

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

    Round trip

    Economy

    from
    $337Fare subject to changes
    Updated: 9 hours ago

    Portland, OR (PDX)to

    Saint Louis (STL)
    10/24/26 - 10/31/26

    Round trip

    Economy

    from
    $337Fare subject to changes
    Updated: 9 hours ago

    Portland, OR (PDX)to

    Saint Louis (STL)
    11/03/26 - 11/10/26

    Round trip

    Economy

    from
    $337Fare subject to changes
    Updated: 9 hours ago

    Portland, OR (PDX)to

    Saint Louis (STL)
    10/06/26 - 10/13/26

    Round trip

    Economy

    from
    $337Fare subject to changes
    Updated: 9 hours ago

    Portland, OR (PDX)to

    Saint Louis (STL)
    10/13/26 - 10/20/26

    Round trip

    Economy

    from
    $337Fare subject to changes
    Updated: 9 hours ago

    Portland, OR (PDX)to

    Saint Louis (STL)
    10/14/26 - 10/21/26

    Round trip

    Economy

    from
    $337Fare subject to changes
    Updated: 9 hours ago

    Portland, OR (PDX)to

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

    Round trip

    Economy

    from
    $337Fare subject to changes
    Updated: 9 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 Portland, OR to Saint Louis

    Looking for lower fares on your trip from Portland, OR 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 Portland, OR to Saint Louis