Southwest® flights from Denver to Ontario/LA from $79

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Low fares from Denver to Ontario/LA

$

Denver (DEN)to

Ontario/LA (ONT)
Depart: 10/30/2026

One-way

Basic

From
$79
Seen: 7 hrs ago

Denver (DEN)to

Ontario/LA (ONT)
Depart: 09/06/2026

One-way

Basic

From
$79
Seen: 6 hrs ago

Denver (DEN)to

Ontario/LA (ONT)
Depart: 09/05/2026

One-way

Basic

From
$79
Seen: 45 minutes ago

Denver (DEN)to

Ontario/LA (ONT)
Depart: 09/11/2026

One-way

Basic

From
$79
Seen: 2 hrs ago

Denver (DEN)to

Ontario/LA (ONT)
Depart: 09/06/2026

One-way

Choice

From
$119
Seen: 6 hrs ago

Denver (DEN)to

Ontario/LA (ONT)
Depart: 09/05/2026

One-way

Choice

From
$119
Seen: 45 minutes ago

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Explore flights from Denver to Ontario/LA

Aug 2026
From$173*
Seen: 1 hour ago
One Way/Basic
Sep 2026
From$79*
Seen: 6 hrs ago
One Way/Basic
Oct 2026
From$79*
Seen: 7 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $173
cmp-daily-histogram-bars-legend-max-price-aria-label $502
Displaying fares for August-2026
  • DEN–ONT, 08/02/2026: From $502
    02

    Sun

    AUG

  • DEN–ONT, 08/03/2026: From $502
    03

    Mon

  • DEN–ONT, 08/04/2026: From $502
    04

    Tue

  • DEN–ONT, 08/05/2026: From $502
    05

    Wed

  • DEN–ONT, 08/06/2026: From $502
    06

    Thu

  • DEN–ONT, 08/07/2026: From $325
    07

    Fri

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

    Sat

  • DEN–ONT, 08/09/2026: From $325
    09

    Sun

  • DEN–ONT, 08/10/2026: From $325
    10

    Mon

  • DEN–ONT, 08/11/2026: From $325
    11

    Tue

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    12

    Wed

  • DEN–ONT, 08/13/2026: From $325
    13

    Thu

  • DEN–ONT, 08/14/2026: From $175
    14

    Fri

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    15

    Sat

  • DEN–ONT, 08/16/2026: From $223
    16

    Sun

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    17

    Mon

  • DEN–ONT, 08/18/2026: From $175
    18

    Tue

  • DEN–ONT, 08/19/2026: From $175
    19

    Wed

  • DEN–ONT, 08/20/2026: From $175
    20

    Thu

  • DEN–ONT, 08/21/2026: From $175
    21

    Fri

  • DEN–ONT, 08/22/2026: From $173
    22

    Sat

  • DEN–ONT, 08/23/2026: From $223
    23

    Sun

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

    Mon

  • DEN–ONT, 08/25/2026: From $173
    25

    Tue

  • DEN–ONT, 08/26/2026: From $173
    26

    Wed

  • DEN–ONT, 08/27/2026: From $173
    27

    Thu

  • DEN–ONT, 08/28/2026: From $175
    28

    Fri

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    29

    Sat

  • DEN–ONT, 08/30/2026: From $223
    30

    Sun

  • DEN–ONT, 08/31/2026: From $173
    31

    Mon

  • DEN–ONT, 09/01/2026: From $173
    01

    Tue

    SEP

    • Range$173-$502

    *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:
    Denver International Airport
    Arriving at:
    LA/Ontario International Airport
    Average flight time:
    2 hours 16 minutes
    Distance:
    819 miles

    Route Information

    157† Weekly flights
    • 3‡ Nonstop flights per day Monday through Friday
    • 3‡ Nonstop flights on Saturday
    • 4‡ Nonstop flights on Sunday

    † 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

    The average flight time from Denver to Ontario/LA is 2 hours 16 minutes.
    There are 157 weekly flights from Denver to Ontario/LA on Southwest Airlines.
    Yes, Southwest flies nonstop from Denver to Ontario/LA 3 times per day from Monday through Friday.
    Yes, Southwest flies nonstop from Denver to Ontario/LA 3 times per day on Saturdays and 4 times per day on Sundays.
    To find the lowest fares by day and time to fly Denver 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 Denver 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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