American Airlines flights from Ontario to Washington, D.C.

Recent searches for flights from Ontario to Washington, D.C.

Aug 2026
From$351*
Updated: 14 hours ago
Round tripIEconomy
Sep 2026
From$351*
Updated: 14 hours ago
Round tripIEconomy
Oct 2026
From$351*
Updated: 14 hours ago
Round tripIEconomy
cmp-daily-histogram-bars-legend-min-price-aria-label $351
cmp-daily-histogram-bars-legend-max-price-aria-label $653
Displaying fares for August-2026
  • ONT–WAS, 08/05/26 – 08/12/26: From $567
    05

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    AUG

  • ONT–WAS, 08/06/26 – 08/13/26: From $653
    06

    Th

  • ONT–WAS, 08/07/26 – 08/14/26: From $589
    07

    Fr

  • ONT–IAD, 08/08/26 – 08/15/26: From $567
    08

    Sa

  • ONT–WAS, 08/09/26 – 08/16/26: From $653
    09

    Su

  • ONT–WAS, 08/10/26 – 08/17/26: From $607
    10

    Mo

  • ONT–WAS, 08/11/26 – 08/18/26: From $504
    11

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  • ONT–WAS, 08/12/26 – 08/19/26: From $504
    12

    We

  • ONT–WAS, 08/13/26 – 08/20/26: From $589
    13

    Th

  • ONT–WAS, 08/14/26 – 08/21/26: From $589
    14

    Fr

  • ONT–WAS, 08/15/26 – 08/22/26: From $504
    15

    Sa

  • ONT–WAS, 08/16/26 – 08/23/26: From $642
    16

    Su

  • ONT–IAD, 08/17/26 – 08/30/26: From $582
    17

    Mo

  • ONT–WAS, 08/18/26 – 08/25/26: From $376
    18

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  • ONT–DCA, 08/19/26 – 08/26/26: From $376
    19

    We

  • ONT–WAS, 08/20/26 – 08/27/26: From $468
    20

    Th

  • ONT–WAS, 08/21/26 – 08/28/26: From $483
    21

    Fr

  • ONT–WAS, 08/22/26 – 08/29/26: From $376
    22

    Sa

  • ONT–WAS, 08/23/26 – 08/30/26: From $498
    23

    Su

  • ONT–WAS, 08/24/26 – 08/31/26: From $468
    24

    Mo

  • ONT–WAS, 08/25/26 – 09/01/26: From $351
    25

    Tu

  • ONT–WAS, 08/26/26 – 09/02/26: From $351
    26

    We

  • ONT–WAS, 08/27/26 – 09/03/26: From $475
    27

    Th

  • ONT–WAS, 08/28/26 – 09/04/26: From $441
    28

    Fr

  • ONT–WAS, 08/29/26 – 09/05/26: From $351
    29

    Sa

  • ONT–WAS, 08/30/26 – 09/06/26: From $381
    30

    Su

  • ONT–WAS, 08/31/26 – 09/07/26: From $433
    31

    Mo

  • ONT–WAS: cmp-view-offers-disclaimer. Find Offers
    01

    Tu

    SEP

  • ONT–IAD, 09/02/26 – 09/16/26: From $351
    02

    We

  • ONT–WAS: cmp-view-offers-disclaimer. Find Offers
    03

    Th

  • ONT–WAS, 09/04/26 – 09/11/26: From $433
    04

    Fr

    • range$351-$653

    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 Washington, D.C. flights

    $
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    Ontario (ONT)to

    Washington, D.C. (WAS)
    10/27/26 - 11/03/26

    Round trip

    Economy

    from
    $351Fare subject to changes
    Updated: 14 hours ago

    Ontario (ONT)to

    Washington, D.C. (WAS)
    09/09/26 - 09/16/26

    Round trip

    Economy

    from
    $351Fare subject to changes
    Updated: 14 hours ago

    Ontario (ONT)to

    Washington, D.C. (WAS)
    09/15/26 - 09/22/26

    Round trip

    Economy

    from
    $351Fare subject to changes
    Updated: 14 hours ago

    Ontario (ONT)to

    Washington, D.C. (WAS)
    09/22/26 - 09/29/26

    Round trip

    Economy

    from
    $351Fare subject to changes
    Updated: 14 hours ago

    Ontario (ONT)to

    Washington, D.C. (WAS)
    09/26/26 - 10/03/26

    Round trip

    Economy

    from
    $351Fare subject to changes
    Updated: 14 hours ago

    Ontario (ONT)to

    Washington, D.C. (WAS)
    08/25/26 - 09/01/26

    Round trip

    Economy

    from
    $351Fare subject to changes
    Updated: 14 hours ago

    Ontario (ONT)to

    Washington, D.C. (WAS)
    10/20/26 - 10/27/26

    Round trip

    Economy

    from
    $351Fare subject to changes
    Updated: 14 hours ago

    Ontario (ONT)to

    Washington, D.C. (WAS)
    10/21/26 - 10/28/26

    Round trip

    Economy

    from
    $351Fare subject to changes
    Updated: 14 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 Washington, D.C.

    Looking for lower fares on your trip from Ontario to Washington, D.C.? 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 Ontario to Washington, D.C.