Southwest® flights from Washington D.C. Reagan National to Ontario/LA from $122

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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: 01/13/2027

One-way

Basic

From
$122
Seen: 15 hrs ago

Washington D.C. Reagan National (DCA)to

Ontario/LA (ONT)
Depart: 11/17/2026

One-way

Basic

From
$122
Seen: 15 hrs ago

Washington D.C. Reagan National (DCA)to

Ontario/LA (ONT)
Depart: 12/09/2026

One-way

Basic

From
$122
Seen: 11 hrs ago

Washington D.C. Reagan National (DCA)to

Ontario/LA (ONT)
Depart: 01/12/2027

One-way

Basic

From
$122
Seen: 18 hrs ago

Washington D.C. Reagan National (DCA)to

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

One-way

Basic

From
$122
Seen: 14 hrs ago

Washington D.C. Reagan National (DCA)to

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

One-way

Basic

From
$127
Seen: 8 hrs ago

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

Oct 2026
From$304*
Seen: 8 hrs ago
One Way/Basic
Nov 2026
From$122*
Seen: 15 hrs ago
One Way/Basic
Dec 2026
From$122*
Seen: 14 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $122
cmp-daily-histogram-bars-legend-max-price-aria-label $392
Displaying fares for October-2026
  • DCA–ONT, 10/22/2026: From $392
    22

    Thu

    OCT

  • DCA–ONT, 10/23/2026: From $392
    23

    Fri

  • DCA–ONT, 10/24/2026: From $304
    24

    Sat

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    25

    Sun

  • DCA–ONT, 10/26/2026: From $392
    26

    Mon

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    27

    Tue

  • DCA–ONT, 10/28/2026: From $304
    28

    Wed

  • DCA–ONT, 10/29/2026: From $392
    29

    Thu

  • DCA–ONT, 10/30/2026: From $392
    30

    Fri

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    31

    Sat

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    01

    Sun

    NOV

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    02

    Mon

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    03

    Tue

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    04

    Wed

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    05

    Thu

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    06

    Fri

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    07

    Sat

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    08

    Sun

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    09

    Mon

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    10

    Tue

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    11

    Wed

  • DCA–ONT, 11/12/2026: From $250
    12

    Thu

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    13

    Fri

  • DCA–ONT, 11/14/2026: From $186
    14

    Sat

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    15

    Sun

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    16

    Mon

  • DCA–ONT, 11/17/2026: From $122
    17

    Tue

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    18

    Wed

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    19

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    20

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    21

    Sat

    • Range$122-$392

    *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

    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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