American Airlines flights from Chicago to Ontario

Recent searches for flights from Chicago to Ontario

Mar 2026
From$413*
Updated: 9 hours ago
Round tripIEconomy
Apr 2026
From$285*
Updated: 11 hours ago
Round tripIEconomy
May 2026
From$337*
Updated: 15 hours ago
Round tripIEconomy
$285
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    • range$285-$903

    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 Chicago to Ontario flights

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    Chicago (ORD)to

    Ontario (ONT)
    04/08/26 - 04/10/26

    Round trip

    Economy

    from
    $285Fare subject to changes
    Updated: 11 hours ago

    Chicago (ORD)to

    Ontario (ONT)
    04/11/26 - 04/14/26

    Round trip

    Economy

    from
    $327Fare subject to changes
    Updated: 2 hours ago

    Chicago (ORD)to

    Ontario (ONT)
    05/01/26 - 05/08/26

    Round trip

    Economy

    from
    $337Fare subject to changes
    Updated: 15 hours ago

    Chicago (ORD)to

    Ontario (ONT)
    04/23/26 - 04/25/26

    Round trip

    Economy

    from
    $337Fare subject to changes
    Updated: 15 hours ago

    Chicago (ORD)to

    Ontario (ONT)
    04/09/26 - 04/12/26

    Round trip

    Economy

    from
    $343Fare subject to changes
    Updated: 12 hours ago

    Chicago (ORD)to

    Ontario (ONT)
    04/09/26 - 04/10/26

    Round trip

    Economy

    from
    $347Fare subject to changes
    Updated: 12 hours ago

    Chicago (ORD)to

    Ontario (ONT)
    04/20/26 - 04/25/26

    Round trip

    Economy

    from
    $392Fare subject to changes
    Updated: 3 hours ago

    Chicago (ORD)to

    Ontario (ONT)
    04/20/26 - 04/23/26

    Round trip

    Economy

    from
    $392Fare 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.

    American Airlines flights from Chicago to Ontario

    Earn up to $400 back on your next American Airlines flight plus, 30,000 bonus miles. Terms apply. Opens another site in a new window that may not meet accessibility guidelines.