Southwest® flights from Ontario/LA to Denver from $80

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Low fares from Ontario/LA to Denver

$

Ontario/LA (ONT)to

Denver (DEN)
Depart: 01/12/2027

One-way

Basic

From
$80
Seen: 9 hrs ago

Ontario/LA (ONT)to

Denver (DEN)
Depart: 01/09/2027

One-way

Basic

From
$80
Seen: 15 hrs ago

Ontario/LA (ONT)to

Denver (DEN)
Depart: 12/05/2026

One-way

Basic

From
$80
Seen: 6 hrs ago

Ontario/LA (ONT)to

Denver (DEN)
Depart: 12/08/2026

One-way

Basic

From
$80
Seen: 2 hrs ago

Ontario/LA (ONT)to

Denver (DEN)
Depart: 12/15/2026

One-way

Basic

From
$80
Seen: 1 hour ago

Ontario/LA (ONT)to

Denver (DEN)
Depart: 01/23/2027

One-way

Basic

From
$80
Seen: 10 hrs ago

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Explore flights from Ontario/LA to Denver

Nov 2026
From$248*
Seen: 3 hrs ago
One Way/Basic
Dec 2026
From$80*
Seen: 6 hrs ago
One Way/Basic
Jan 2027
From$80*
Seen: 10 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $80
cmp-daily-histogram-bars-legend-max-price-aria-label $664
Displaying fares for November-2026
  • ONT–DEN, 11/10/2026: From $664
    10

    Tue

    NOV

  • ONT–DEN, 11/11/2026: From $664
    11

    Wed

  • ONT–DEN, 11/12/2026: From $664
    12

    Thu

  • ONT–DEN, 11/13/2026: From $664
    13

    Fri

  • ONT–DEN, 11/14/2026: From $664
    14

    Sat

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

    Sun

  • ONT–DEN, 11/16/2026: From $437
    16

    Mon

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

    Tue

  • ONT–DEN, 11/18/2026: From $437
    18

    Wed

  • ONT–DEN, 11/19/2026: From $437
    19

    Thu

  • ONT–DEN, 11/20/2026: From $437
    20

    Fri

  • ONT–DEN, 11/21/2026: From $437
    21

    Sat

  • ONT–DEN, 11/22/2026: From $437
    22

    Sun

  • ONT–DEN, 11/23/2026: From $310
    23

    Mon

  • ONT–DEN, 11/24/2026: From $310
    24

    Tue

  • ONT–DEN, 11/25/2026: From $310
    25

    Wed

  • ONT–DEN, 11/26/2026: From $310
    26

    Thu

  • ONT–DEN, 11/27/2026: From $310
    27

    Fri

  • ONT–DEN, 11/28/2026: From $340
    28

    Sat

  • ONT–DEN, 11/29/2026: From $340
    29

    Sun

  • ONT–DEN, 11/30/2026: From $248
    30

    Mon

  • ONT–DEN, 12/01/2026: From $80
    01

    Tue

    DEC

  • ONT–DEN, 12/02/2026: From $90
    02

    Wed

  • ONT–DEN, 12/03/2026: From $135
    03

    Thu

  • ONT–DEN, 12/04/2026: From $145
    04

    Fri

  • ONT–DEN, 12/05/2026: From $80
    05

    Sat

  • ONT–DEN, 12/06/2026: From $276
    06

    Sun

  • ONT–DEN, 12/07/2026: From $135
    07

    Mon

  • ONT–DEN, 12/08/2026: From $80
    08

    Tue

  • ONT–DEN, 12/09/2026: From $80
    09

    Wed

    • Range$80-$664

    *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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