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

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Low fares from Ontario/LA to Denver

$

Ontario/LA (ONT)to

Denver (DEN)
Depart: 01/20/2027

One-way

Basic

From
$105
Seen: 14 hrs ago

Ontario/LA (ONT)to

Denver (DEN)
Depart: 12/22/2026

One-way

Basic

From
$105
Seen: 9 hrs ago

Ontario/LA (ONT)to

Denver (DEN)
Depart: 12/10/2026

One-way

Basic

From
$105
Seen: 12 hrs ago

Ontario/LA (ONT)to

Denver (DEN)
Depart: 01/10/2027

One-way

Basic

From
$105
Seen: 8 hrs ago

Ontario/LA (ONT)to

Denver (DEN)
Depart: 11/17/2026

One-way

Basic

From
$105
Seen: 7 hrs ago

Ontario/LA (ONT)to

Denver (DEN)
Depart: 12/24/2026

One-way

Basic

From
$105
Seen: 15 hrs ago

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Explore flights from Ontario/LA to Denver

Oct 2026
From$432*
Seen: 9 hrs ago
One Way/Basic
Nov 2026
From$105*
Seen: 14 hrs ago
One Way/Basic
Dec 2026
From$105*
Seen: 4 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
  • ONT–DEN, 10/20/2026: From $659
    20

    Tue

    OCT

  • ONT–DEN, 10/21/2026: From $659
    21

    Wed

  • ONT–DEN, 10/22/2026: From $659
    22

    Thu

  • ONT–DEN, 10/23/2026: From $659
    23

    Fri

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

    Sat

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

    Sun

  • ONT–DEN, 10/26/2026: From $432
    26

    Mon

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

    Tue

  • ONT–DEN: cmp-view-offers-disclaimer. Find Offers
    28

    Wed

  • ONT–DEN, 10/29/2026: From $432
    29

    Thu

  • ONT–DEN: cmp-view-offers-disclaimer. Find Offers
    30

    Fri

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

    Sat

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

    Sun

    NOV

  • ONT–DEN: cmp-view-offers-disclaimer. Find Offers
    02

    Mon

  • ONT–DEN, 11/03/2026: From $305
    03

    Tue

  • ONT–DEN, 11/04/2026: From $305
    04

    Wed

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

    Thu

  • ONT–DEN, 11/06/2026: From $305
    06

    Fri

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

    Sat

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

    Sun

  • ONT–DEN, 11/09/2026: From $115
    09

    Mon

  • ONT–DEN, 11/10/2026: From $105
    10

    Tue

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

    Wed

  • ONT–DEN, 11/12/2026: From $105
    12

    Thu

  • ONT–DEN, 11/13/2026: From $220
    13

    Fri

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

    Sat

  • ONT–DEN, 11/15/2026: From $245
    15

    Sun

  • ONT–DEN, 11/16/2026: From $271
    16

    Mon

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

    Tue

  • ONT–DEN, 11/18/2026: From $115
    18

    Wed

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

    Thu

    • 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:
    LA/Ontario International Airport
    Arriving at:
    Denver International Airport
    Average flight time:
    2 hours 12 minutes
    Distance:
    819 miles

    Questions we hear the most

    The average flight time from Ontario/LA to Denver is 2 hours 12 minutes.
    There are 156 weekly flights from Ontario/LA to Denver on Southwest Airlines.
    Yes, Southwest flies nonstop from Ontario/LA to Denver 3 times per day from Monday through Friday.
    Yes, Southwest flies nonstop from Ontario/LA to Denver 3 times per day on Saturdays and 4 times per day on Sundays.
    To find the lowest fares by day and time to fly Ontario/LA to Denver with Southwest, check out our Low Fare Calendar.
    You can rent a car at Denver International Airport book yours with your flight.
    Yes! Flights from Ontario/LA to Denver—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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