Flights from Denver, CO to Ontario/LA, CA

Promo Code

Best Deals on Flights From Denver, CO (DEN) to Ontario/LA, CA (ONT)

Sep 2026
from$146*
Last seen: 3 hours ago
One-way/Economy
Oct 2026
from$33*
Last seen: 23 hours ago
One-way/Economy
Nov 2026
from$89*
Last seen: 13 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $33
cmp-daily-histogram-bars-legend-max-price-aria-label $189
Displaying fares for September-2026
  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    13

    Sun

    SEP

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    14

    Mon

  • DEN–ONT, Sep 15, 2026: from $189
    15

    Tue

  • DEN–ONT, Sep 16, 2026: from $189
    16

    Wed

  • DEN–ONT, Sep 17, 2026: from $189
    17

    Thu

  • DEN–ONT, Sep 18, 2026: from $189
    18

    Fri

  • DEN–ONT, Sep 19, 2026: from $189
    19

    Sat

  • DEN–ONT, Sep 20, 2026: from $179
    20

    Sun

  • DEN–ONT, Sep 21, 2026: from $179
    21

    Mon

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    22

    Tue

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    23

    Wed

  • DEN–ONT, Sep 24, 2026: from $179
    24

    Thu

  • DEN–ONT, Sep 25, 2026: from $157
    25

    Fri

  • DEN–ONT, Sep 26, 2026: from $146
    26

    Sat

  • DEN–ONT, Sep 27, 2026: from $146
    27

    Sun

  • DEN–ONT, Sep 28, 2026: from $146
    28

    Mon

  • DEN–ONT, Sep 29, 2026: from $146
    29

    Tue

  • DEN–ONT, Sep 30, 2026: from $146
    30

    Wed

  • DEN–ONT, Oct 1, 2026: from $146
    01

    Thu

    OCT

  • DEN–ONT, Oct 2, 2026: from $95
    02

    Fri

  • DEN–ONT, Oct 3, 2026: from $96
    03

    Sat

  • DEN–ONT, Oct 4, 2026: from $145
    04

    Sun

  • DEN–ONT, Oct 5, 2026: from $105
    05

    Mon

  • DEN–ONT, Oct 6, 2026: from $33
    06

    Tue

  • DEN–ONT, Oct 7, 2026: from $105
    07

    Wed

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

    Thu

  • DEN–ONT, Oct 9, 2026: from $155
    09

    Fri

  • DEN–ONT, Oct 10, 2026: from $138
    10

    Sat

  • DEN–ONT, Oct 11, 2026: from $146
    11

    Sun

  • DEN–ONT, Oct 12, 2026: from $105
    12

    Mon

    • Range$33-$189

    *Prices found by others in the previous 48 hours for round-trip flights. Prices shown may also require membership in our travel club, Discount Den.

    Flights Deals from Denver, CO to Ontario/LA, CA on Frontier

    $
    Flights Deals from Denver, CO to Ontario/LA, CA on Frontier
    From
    To
    Denver, CO (DEN)Ontario/LA, CA (ONT)One-way
    /
    Discount Den Basic Fare    		Departing Dec 16, 2026

    From

    $105

    Last seen: 19 hours ago

    *Prices found by others in the previous 48 hours for one-way flights. Prices shown may also require membership in our travel club, Discount Den®.

    Denver, CO Ontario/LA, CA

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