American Airlines flights from Denver to Ontario

Recent searches for flights from Denver to Ontario

Sep 2026
From$177*
Updated: 7 hours ago
Round tripIEconomy
Oct 2026
From$177*
Updated: 7 hours ago
Round tripIEconomy
Nov 2026
From$177*
Updated: 7 hours ago
Round tripIEconomy
cmp-daily-histogram-bars-legend-min-price-aria-label $177
cmp-daily-histogram-bars-legend-max-price-aria-label $969
Displaying fares for September-2026
  • DEN–ONT, 09/09/26 – 09/16/26: From $844
    09

    We

    SEP

  • DEN–ONT, 09/10/26 – 09/17/26: From $969
    10

    Th

  • DEN–ONT, 09/11/26 – 09/18/26: From $953
    11

    Fr

  • DEN–ONT, 09/12/26 – 09/19/26: From $839
    12

    Sa

  • DEN–ONT, 09/13/26 – 09/20/26: From $969
    13

    Su

  • DEN–ONT, 09/14/26 – 09/21/26: From $953
    14

    Mo

  • DEN–ONT, 09/15/26 – 09/22/26: From $716
    15

    Tu

  • DEN–ONT, 09/16/26 – 09/23/26: From $716
    16

    We

  • DEN–ONT, 09/17/26 – 09/24/26: From $716
    17

    Th

  • DEN–ONT, 09/18/26 – 09/25/26: From $716
    18

    Fr

  • DEN–ONT, 09/19/26 – 09/26/26: From $716
    19

    Sa

  • DEN–ONT, 09/20/26 – 09/27/26: From $716
    20

    Su

  • DEN–ONT, 09/21/26 – 09/28/26: From $716
    21

    Mo

  • DEN–ONT, 09/22/26 – 09/29/26: From $511
    22

    Tu

  • DEN–ONT, 09/23/26 – 09/30/26: From $528
    23

    We

  • DEN–ONT, 09/24/26 – 10/01/26: From $511
    24

    Th

  • DEN–ONT, 09/25/26 – 10/02/26: From $555
    25

    Fr

  • DEN–ONT, 09/26/26 – 10/03/26: From $528
    26

    Sa

  • DEN–ONT, 09/27/26 – 10/04/26: From $572
    27

    Su

  • DEN–ONT, 09/28/26 – 10/05/26: From $350
    28

    Mo

  • DEN–ONT, 09/29/26 – 10/06/26: From $177
    29

    Tu

  • DEN–ONT, 09/30/26 – 10/07/26: From $177
    30

    We

  • DEN–ONT, 10/01/26 – 10/08/26: From $230
    01

    Th

    OCT

  • DEN–ONT, 10/02/26 – 10/09/26: From $362
    02

    Fr

  • DEN–ONT, 10/03/26 – 10/10/26: From $282
    03

    Sa

  • DEN–ONT, 10/04/26 – 10/11/26: From $521
    04

    Su

  • DEN–ONT, 10/05/26 – 10/12/26: From $230
    05

    Mo

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    06

    Tu

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    07

    We

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    08

    Th

    • range$177-$969

    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 Denver to Ontario flights

    $
    keyboard_arrow_down

    Denver (DEN)to

    Ontario (ONT)
    10/17/26 - 10/24/26

    Round trip

    Economy

    from
    $177Fare subject to changes
    Updated: 7 hours ago

    Denver (DEN)to

    Ontario (ONT)
    10/31/26 - 11/07/26

    Round trip

    Economy

    from
    $177Fare subject to changes
    Updated: 7 hours ago

    Denver (DEN)to

    Ontario (ONT)
    09/29/26 - 10/06/26

    Round trip

    Economy

    from
    $177Fare subject to changes
    Updated: 7 hours ago

    Denver (DEN)to

    Ontario (ONT)
    12/01/26 - 12/08/26

    Round trip

    Economy

    from
    $177Fare subject to changes
    Updated: 7 hours ago

    Denver (DEN)to

    Ontario (ONT)
    10/14/26 - 10/21/26

    Round trip

    Economy

    from
    $177Fare subject to changes
    Updated: 7 hours ago

    Denver (DEN)to

    Ontario (ONT)
    10/20/26 - 10/27/26

    Round trip

    Economy

    from
    $177Fare subject to changes
    Updated: 7 hours ago

    Denver (DEN)to

    Ontario (ONT)
    10/24/26 - 10/31/26

    Round trip

    Economy

    from
    $177Fare subject to changes
    Updated: 7 hours ago

    Denver (DEN)to

    Ontario (ONT)
    10/27/26 - 11/03/26

    Round trip

    Economy

    from
    $177Fare 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.

    Finding cheap flights from Denver to Ontario

    Looking for lower fares on your trip from Denver to Ontario? 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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    Discover how Main Cabin Extra can enhance your trip.

    American Airlines flights from Denver to Ontario