Southwest® flights from Denver to Ontario/LA from $105

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Low fares from Denver to Ontario/LA

$

Denver (DEN)to

Ontario/LA (ONT)
Depart: 01/04/2027

One-way

Basic

From
$105
Seen: 19 hrs ago

Denver (DEN)to

Ontario/LA (ONT)
Depart: 11/14/2026

One-way

Basic

From
$105
Seen: 20 hrs ago

Denver (DEN)to

Ontario/LA (ONT)
Depart: 12/04/2026

One-way

Basic

From
$105
Seen: 23 hrs ago

Denver (DEN)to

Ontario/LA (ONT)
Depart: 01/07/2027

One-way

Basic

From
$105
Seen: 2 hrs ago

Denver (DEN)to

Ontario/LA (ONT)
Depart: 12/25/2026

One-way

Basic

From
$105
Seen: 53 minutes ago

Denver (DEN)to

Ontario/LA (ONT)
Depart: 01/15/2027

One-way

Basic

From
$105
Seen: 21 hrs ago

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Explore flights from Denver to Ontario/LA

Oct 2026
From$432*
Seen: 14 hrs ago
One Way/Basic
Nov 2026
From$105*
Seen: 4 hrs ago
One Way/Basic
Dec 2026
From$105*
Seen: 9 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $105
cmp-daily-histogram-bars-legend-max-price-aria-label $659
Displaying fares for October-2026
  • DEN–ONT, 10/23/2026: From $659
    23

    Fri

    OCT

  • DEN–ONT, 10/24/2026: From $659
    24

    Sat

  • DEN–ONT, 10/25/2026: From $659
    25

    Sun

  • DEN–ONT, 10/26/2026: From $659
    26

    Mon

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    27

    Tue

  • DEN–ONT, 10/28/2026: From $659
    28

    Wed

  • DEN–ONT, 10/29/2026: From $512
    29

    Thu

  • DEN–ONT, 10/30/2026: From $432
    30

    Fri

  • DEN–ONT, 10/31/2026: From $432
    31

    Sat

  • DEN–ONT, 11/01/2026: From $432
    01

    Sun

    NOV

  • DEN–ONT, 11/02/2026: From $432
    02

    Mon

  • DEN–ONT, 11/03/2026: From $432
    03

    Tue

  • DEN–ONT, 11/04/2026: From $432
    04

    Wed

  • DEN–ONT, 11/05/2026: From $305
    05

    Thu

  • DEN–ONT, 11/06/2026: From $425
    06

    Fri

  • DEN–ONT, 11/07/2026: From $305
    07

    Sat

  • DEN–ONT, 11/08/2026: From $305
    08

    Sun

  • DEN–ONT, 11/09/2026: From $156
    09

    Mon

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    10

    Tue

  • DEN–ONT, 11/11/2026: From $115
    11

    Wed

  • DEN–ONT, 11/12/2026: From $156
    12

    Thu

  • DEN–ONT, 11/13/2026: From $146
    13

    Fri

  • DEN–ONT, 11/14/2026: From $105
    14

    Sat

  • DEN–ONT, 11/15/2026: From $146
    15

    Sun

  • DEN–ONT, 11/16/2026: From $169
    16

    Mon

  • DEN–ONT, 11/17/2026: From $105
    17

    Tue

  • DEN–ONT, 11/18/2026: From $105
    18

    Wed

  • DEN–ONT, 11/19/2026: From $115
    19

    Thu

  • DEN–ONT, 11/20/2026: From $230
    20

    Fri

  • DEN–ONT, 11/21/2026: From $179
    21

    Sat

  • DEN–ONT, 11/22/2026: From $146
    22

    Sun

    • Range$105-$659

    *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

    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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