Flights from Ontario/LA, CA to Denver, CO

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

Nov 2026
from$81*
Last seen: 2 hours ago
One-way/Economy
Dec 2026
from$33*
Last seen: 2 hours ago
One-way/Economy
Jan 2027
from$33*
Last seen: 1 hour ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $33
cmp-daily-histogram-bars-legend-max-price-aria-label $253
Displaying fares for November-2026
  • ONT–DEN: cmp-view-offers-disclaimer. Find Offers
    08

    Sun

    NOV

  • ONT–DEN: cmp-view-offers-disclaimer. Find Offers
    09

    Mon

  • ONT–DEN, Nov 10, 2026: from $219
    10

    Tue

  • ONT–DEN: cmp-view-offers-disclaimer. Find Offers
    11

    Wed

  • ONT–DEN, Nov 12, 2026: from $225
    12

    Thu

  • ONT–DEN: cmp-view-offers-disclaimer. Find Offers
    13

    Fri

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

    Sat

  • ONT–DEN, Nov 15, 2026: from $190
    15

    Sun

  • ONT–DEN, Nov 16, 2026: from $171
    16

    Mon

  • ONT–DEN, Nov 17, 2026: from $144
    17

    Tue

  • ONT–DEN, Nov 18, 2026: from $144
    18

    Wed

  • ONT–DEN, Nov 19, 2026: from $184
    19

    Thu

  • ONT–DEN, Nov 20, 2026: from $184
    20

    Fri

  • ONT–DEN, Nov 21, 2026: from $124
    21

    Sat

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

    Sun

  • ONT–DEN, Nov 23, 2026: from $164
    23

    Mon

  • ONT–DEN, Nov 24, 2026: from $130
    24

    Tue

  • ONT–DEN, Nov 25, 2026: from $144
    25

    Wed

  • ONT–DEN, Nov 26, 2026: from $126
    26

    Thu

  • ONT–DEN, Nov 27, 2026: from $200
    27

    Fri

  • ONT–DEN, Nov 28, 2026: from $197
    28

    Sat

  • ONT–DEN, Nov 29, 2026: from $253
    29

    Sun

  • ONT–DEN, Nov 30, 2026: from $81
    30

    Mon

  • ONT–DEN, Dec 1, 2026: from $81
    01

    Tue

    DEC

  • ONT–DEN, Dec 2, 2026: from $33
    02

    Wed

  • ONT–DEN, Dec 3, 2026: from $60
    03

    Thu

  • ONT–DEN: cmp-view-offers-disclaimer. Find Offers
    04

    Fri

  • ONT–DEN, Dec 5, 2026: from $44
    05

    Sat

  • ONT–DEN: cmp-view-offers-disclaimer. Find Offers
    06

    Sun

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

    Mon

    • Range$33-$253

    *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 Ontario/LA, CA to Denver, CO on Frontier

    $
    Flights Deals from Ontario/LA, CA to Denver, CO on Frontier
    From
    To
    Ontario/LA, CA (ONT)Denver, CO (DEN)One-way
    /
    Discount Den Basic Fare    		Departing Feb 8, 2027

    From

    $89

    Last seen: 2 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®.

    Ontario/LA, CA Denver, CO

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