Southwest® flights from Washington D.C. Reagan National to Ontario/LA from $176

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Low fares from Washington D.C. Reagan National to Ontario/LA

$

Washington D.C. Reagan National (DCA)to

Ontario/LA (ONT)
Depart: 11/04/2026

One-way

Basic

From
$176
Seen: 4 hrs ago

Washington D.C. Reagan National (DCA)to

Ontario/LA (ONT)
Depart: 10/29/2026

One-way

Basic

From
$176
Seen: 9 hrs ago

Washington D.C. Reagan National (DCA)to

Ontario/LA (ONT)
Depart: 12/15/2026

One-way

Basic

From
$176
Seen: 12 hrs ago

Washington D.C. Reagan National (DCA)to

Ontario/LA (ONT)
Depart: 12/16/2026

One-way

Basic

From
$176
Seen: 4 hrs ago

Washington D.C. Reagan National (DCA)to

Ontario/LA (ONT)
Depart: 11/03/2026

One-way

Basic

From
$176
Seen: 1 hour ago

Washington D.C. Reagan National (DCA)to

Ontario/LA (ONT)
Depart: 10/21/2026

One-way

Basic

From
$181
Seen: 1 hour ago

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Explore flights from Washington D.C. Reagan National to Ontario/LA

Sep 2026
From$284*
Seen: 18 hrs ago
One Way/Basic
Oct 2026
From$176*
Seen: 9 hrs ago
One Way/Basic
Nov 2026
From$176*
Seen: 1 hour ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $231
cmp-daily-histogram-bars-legend-max-price-aria-label $475
Displaying fares for September-2026
  • DCA–ONT, 09/11/2026: From $372
    11

    Fri

    SEP

  • DCA–ONT, 09/12/2026: From $284
    12

    Sat

  • DCA–ONT, 09/13/2026: From $372
    13

    Sun

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    14

    Mon

  • DCA–ONT, 09/15/2026: From $284
    15

    Tue

  • DCA–ONT, 09/16/2026: From $284
    16

    Wed

  • DCA–ONT, 09/17/2026: From $475
    17

    Thu

  • DCA–ONT, 09/18/2026: From $415
    18

    Fri

  • DCA–ONT, 09/19/2026: From $289
    19

    Sat

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    20

    Sun

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    21

    Mon

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    22

    Tue

  • DCA–ONT, 09/23/2026: From $284
    23

    Wed

  • DCA–ONT, 09/24/2026: From $343
    24

    Thu

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    25

    Fri

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    26

    Sat

  • DCA–ONT, 09/27/2026: From $338
    27

    Sun

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    28

    Mon

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    29

    Tue

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    30

    Wed

  • DCA–ONT, 10/01/2026: From $271
    01

    Thu

    OCT

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    02

    Fri

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    03

    Sat

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    04

    Sun

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    05

    Mon

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    06

    Tue

  • DCA–ONT, 10/07/2026: From $231
    07

    Wed

  • DCA–ONT, 10/08/2026: From $338
    08

    Thu

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    09

    Fri

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    10

    Sat

    • Range$231-$475

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    Ronald Reagan National Airport
    Arriving at:
    LA/Ontario International Airport
    Distance:
    2265 miles

    Route Information

    106† Weekly flights

    † Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.

    ‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.

    Questions we hear the most

    There are 106 weekly flights from Washington, D.C. (Reagan National) to Ontario/LA on Southwest Airlines.
    To find the lowest fares by day and time to fly Washington, D.C. (Reagan National) to Ontario/LA with Southwest, check out our Low Fare Calendar.
    You can rent a car at LA/Ontario International Airport book yours with your flight.
    Yes! Flights from Washington, D.C. (Reagan National) to Ontario/LA—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

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