American Airlines flights from Ontario to Saint Louis

Recent searches for flights from Ontario to Saint Louis

Sep 2026
From$527*
Updated: 7 hours ago
Round tripIEconomy
Oct 2026
From$267*
Updated: 7 hours ago
Round tripIEconomy
Nov 2026
From$267*
Updated: 7 hours ago
Round tripIEconomy
cmp-daily-histogram-bars-legend-min-price-aria-label $267
cmp-daily-histogram-bars-legend-max-price-aria-label $763
Displaying fares for September-2026
  • ONT–STL: cmp-view-offers-disclaimer. Find Offers
    15

    Tu

    SEP

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

    We

  • ONT–STL, 09/17/26 – 09/24/26: From $763
    17

    Th

  • ONT–STL, 09/18/26 – 09/25/26: From $763
    18

    Fr

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

    Sa

  • ONT–STL, 09/20/26 – 09/27/26: From $763
    20

    Su

  • ONT–STL, 09/21/26 – 09/28/26: From $763
    21

    Mo

  • ONT–STL, 09/22/26 – 09/29/26: From $587
    22

    Tu

  • ONT–STL, 09/23/26 – 09/30/26: From $587
    23

    We

  • ONT–STL, 09/24/26 – 10/01/26: From $695
    24

    Th

  • ONT–STL, 09/25/26 – 10/02/26: From $695
    25

    Fr

  • ONT–STL, 09/26/26 – 10/03/26: From $587
    26

    Sa

  • ONT–STL, 09/27/26 – 10/04/26: From $695
    27

    Su

  • ONT–STL, 09/28/26 – 10/05/26: From $695
    28

    Mo

  • ONT–STL, 09/29/26 – 10/06/26: From $527
    29

    Tu

  • ONT–STL, 09/30/26 – 10/07/26: From $527
    30

    We

  • ONT–STL, 10/01/26 – 10/08/26: From $558
    01

    Th

    OCT

  • ONT–STL, 10/02/26 – 10/09/26: From $587
    02

    Fr

  • ONT–STL, 10/03/26 – 10/10/26: From $567
    03

    Sa

  • ONT–STL, 10/04/26 – 10/11/26: From $587
    04

    Su

  • ONT–STL, 10/05/26 – 10/12/26: From $340
    05

    Mo

  • ONT–STL, 10/06/26 – 10/13/26: From $267
    06

    Tu

  • ONT–STL, 10/07/26 – 10/14/26: From $267
    07

    We

  • ONT–STL, 10/08/26 – 10/15/26: From $458
    08

    Th

  • ONT–STL, 10/09/26 – 10/16/26: From $358
    09

    Fr

  • ONT–STL, 10/10/26 – 10/17/26: From $267
    10

    Sa

  • ONT–STL, 10/11/26 – 10/18/26: From $517
    11

    Su

  • ONT–STL, 10/12/26 – 10/19/26: From $303
    12

    Mo

  • ONT–STL: cmp-view-offers-disclaimer. Find Offers
    13

    Tu

  • ONT–STL: cmp-view-offers-disclaimer. Find Offers
    14

    We

    • range$267-$763

    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 Ontario to Saint Louis flights

    $
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    Ontario (ONT)to

    Saint Louis (STL)
    10/28/26 - 11/04/26

    Round trip

    Economy

    from
    $267Fare subject to changes
    Updated: 7 hours ago

    Ontario (ONT)to

    Saint Louis (STL)
    10/31/26 - 11/07/26

    Round trip

    Economy

    from
    $267Fare subject to changes
    Updated: 7 hours ago

    Ontario (ONT)to

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

    Round trip

    Economy

    from
    $267Fare subject to changes
    Updated: 7 hours ago

    Ontario (ONT)to

    Saint Louis (STL)
    11/24/26 - 12/01/26

    Round trip

    Economy

    from
    $267Fare subject to changes
    Updated: 7 hours ago

    Ontario (ONT)to

    Saint Louis (STL)
    10/07/26 - 10/14/26

    Round trip

    Economy

    from
    $267Fare subject to changes
    Updated: 7 hours ago

    Ontario (ONT)to

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

    Round trip

    Economy

    from
    $267Fare subject to changes
    Updated: 7 hours ago

    Ontario (ONT)to

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

    Round trip

    Economy

    from
    $267Fare subject to changes
    Updated: 7 hours ago

    Ontario (ONT)to

    Saint Louis (STL)
    12/01/26 - 12/08/26

    Round trip

    Economy

    from
    $267Fare subject to changes
    Updated: 7 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.

    Citi / AAdvantage credit card offer.