Southwest® flights from Atlanta to Ontario/LA from $174

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Low fares from Atlanta to Ontario/LA

$

Atlanta (ATL)to

Ontario/LA (ONT)
Depart: 08/22/2026

One-way

Basic

From
$174
Seen: 16 hrs ago

Atlanta (ATL)to

Ontario/LA (ONT)
Depart: 08/27/2026

One-way

Basic

From
$174
Seen: 15 hrs ago

Atlanta (ATL)to

Ontario/LA (ONT)
Depart: 09/19/2026

One-way

Basic

From
$174
Seen: 12 hrs ago

Atlanta (ATL)to

Ontario/LA (ONT)
Depart: 09/17/2026

One-way

Basic

From
$174
Seen: 2 hrs ago

Atlanta (ATL)to

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

One-way

Basic

From
$174
Seen: 16 hrs ago

Atlanta (ATL)to

Ontario/LA (ONT)
Depart: 10/19/2026

One-way

Basic

From
$174
Seen: 13 hrs ago

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Explore flights from Atlanta to Ontario/LA

Aug 2026
From$174*
Seen: 16 hrs ago
One Way/Basic
Sep 2026
From$174*
Seen: 16 hrs ago
One Way/Basic
Oct 2026
From$174*
Seen: 19 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $174
cmp-daily-histogram-bars-legend-max-price-aria-label $465
Displaying fares for August-2026
  • ATL–ONT, 08/03/2026: From $465
    03

    Mon

    AUG

  • ATL–ONT, 08/04/2026: From $465
    04

    Tue

  • ATL–ONT, 08/05/2026: From $465
    05

    Wed

  • ATL–ONT, 08/06/2026: From $465
    06

    Thu

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

    Fri

  • ATL–ONT, 08/08/2026: From $465
    08

    Sat

  • ATL–ONT, 08/09/2026: From $405
    09

    Sun

  • ATL–ONT, 08/10/2026: From $405
    10

    Mon

  • ATL–ONT: cmp-view-offers-disclaimer. Find Offers
    11

    Tue

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    12

    Wed

  • ATL–ONT, 08/13/2026: From $405
    13

    Thu

  • ATL–ONT, 08/14/2026: From $405
    14

    Fri

  • ATL–ONT, 08/15/2026: From $304
    15

    Sat

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    16

    Sun

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    17

    Mon

  • ATL–ONT: cmp-view-offers-disclaimer. Find Offers
    18

    Tue

  • ATL–ONT, 08/19/2026: From $304
    19

    Wed

  • ATL–ONT: cmp-view-offers-disclaimer. Find Offers
    20

    Thu

  • ATL–ONT, 08/21/2026: From $304
    21

    Fri

  • ATL–ONT, 08/22/2026: From $174
    22

    Sat

  • ATL–ONT, 08/23/2026: From $274
    23

    Sun

  • ATL–ONT: cmp-view-offers-disclaimer. Find Offers
    24

    Mon

  • ATL–ONT: cmp-view-offers-disclaimer. Find Offers
    25

    Tue

  • ATL–ONT: cmp-view-offers-disclaimer. Find Offers
    26

    Wed

  • ATL–ONT, 08/27/2026: From $174
    27

    Thu

  • ATL–ONT, 08/28/2026: From $209
    28

    Fri

  • ATL–ONT, 08/29/2026: From $174
    29

    Sat

  • ATL–ONT, 08/30/2026: From $274
    30

    Sun

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    31

    Mon

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

    Tue

    SEP

  • ATL–ONT, 09/02/2026: From $174
    02

    Wed

    • Range$174-$465

    *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:
    Hartsfield-Jackson Atlanta International Airport
    Arriving at:
    LA/Ontario International Airport
    Distance:
    1900 miles

    Route Information

    145† 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 145 weekly flights from Atlanta to Ontario/LA on Southwest Airlines.
    To find the lowest fares by day and time to fly Atlanta 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 Atlanta 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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