American Airlines flights from Ontario to Chicago

Recent searches for flights from Ontario to Chicago

Sep 2026
From$317*
Updated: 5 hours ago
Round tripIEconomy
Oct 2026
From$317*
Updated: 5 hours ago
Round tripIEconomy
Nov 2026
From$317*
Updated: 5 hours ago
Round tripIEconomy
cmp-daily-histogram-bars-legend-min-price-aria-label $317
cmp-daily-histogram-bars-legend-max-price-aria-label $447
Displaying fares for September-2026
  • ONT–ORD, 09/15/26 – 09/22/26: From $317
    15

    Tu

    SEP

  • ONT–ORD, 09/16/26 – 09/23/26: From $317
    16

    We

  • ONT–ORD, 09/17/26 – 09/24/26: From $338
    17

    Th

  • ONT–ORD, 09/18/26 – 09/24/26: From $338
    18

    Fr

  • ONT–ORD, 09/19/26 – 09/26/26: From $317
    19

    Sa

  • ONT–ORD, 09/20/26 – 09/27/26: From $317
    20

    Su

  • ONT–ORD, 09/21/26 – 09/28/26: From $317
    21

    Mo

  • ONT–ORD, 09/22/26 – 09/29/26: From $317
    22

    Tu

  • ONT–ORD, 09/23/26 – 09/30/26: From $317
    23

    We

  • ONT–ORD, 09/24/26 – 10/01/26: From $317
    24

    Th

  • ONT–ORD, 09/25/26 – 10/02/26: From $317
    25

    Fr

  • ONT–ORD, 09/26/26 – 10/03/26: From $317
    26

    Sa

  • ONT–ORD, 09/27/26 – 10/04/26: From $317
    27

    Su

  • ONT–ORD, 09/28/26 – 10/05/26: From $317
    28

    Mo

  • ONT–ORD, 09/29/26 – 10/06/26: From $317
    29

    Tu

  • ONT–ORD, 09/30/26 – 10/07/26: From $317
    30

    We

  • ONT–ORD, 10/01/26 – 10/08/26: From $338
    01

    Th

    OCT

  • ONT–ORD, 10/02/26 – 10/09/26: From $338
    02

    Fr

  • ONT–ORD, 10/03/26 – 10/10/26: From $317
    03

    Sa

  • ONT–ORD, 10/04/26 – 10/11/26: From $317
    04

    Su

  • ONT–ORD, 10/05/26 – 10/12/26: From $447
    05

    Mo

  • ONT–ORD, 10/06/26 – 10/13/26: From $317
    06

    Tu

  • ONT–ORD, 10/07/26 – 10/14/26: From $317
    07

    We

  • ONT–ORD, 10/08/26 – 10/15/26: From $317
    08

    Th

  • ONT–ORD, 10/09/26 – 10/16/26: From $317
    09

    Fr

  • ONT–ORD, 10/10/26 – 10/17/26: From $317
    10

    Sa

  • ONT–ORD, 10/11/26 – 10/18/26: From $317
    11

    Su

  • ONT–ORD, 10/12/26 – 10/16/26: From $317
    12

    Mo

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

    Tu

  • ONT–ORD, 10/14/26 – 10/17/26: From $317
    14

    We

    • range$317-$447

    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 Chicago flights

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    Ontario (ONT)to

    Chicago (ORD)
    01/21/27 - 01/25/27

    Round trip

    Economy

    from
    $267Fare subject to changes
    Updated: 2 hours ago

    Ontario (ONT)to

    Chicago (ORD)
    10/04/26 - 10/11/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 5 hours ago

    Ontario (ONT)to

    Chicago (ORD)
    10/09/26 - 10/16/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 5 hours ago

    Ontario (ONT)to

    Chicago (ORD)
    10/25/26 - 11/01/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 5 hours ago

    Ontario (ONT)to

    Chicago (ORD)
    09/21/26 - 09/28/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 5 hours ago

    Ontario (ONT)to

    Chicago (ORD)
    09/23/26 - 09/30/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 5 hours ago

    Ontario (ONT)to

    Chicago (ORD)
    09/26/26 - 10/03/26

    Round trip

    Economy

    from
    $317Fare subject to changes
    Updated: 5 hours ago

    Ontario (ONT)to

    Chicago (ORD)
    09/27/26 - 10/04/26

    Round trip

    Economy

    from
    $317Fare 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 Ontario to Chicago

    Looking for lower fares on your trip from Ontario to Chicago? 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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    • 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 Ontario to Chicago