Flights from Denver, CO to Ontario/LA, CA

Promo Code

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

Oct 2026
from$214*
Last seen: 2 hours ago
One-way/Economy
Nov 2026
from$19*
Last seen: 11 hours ago
One-way/Economy
Dec 2026
from$19*
Last seen: 14 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $19
cmp-daily-histogram-bars-legend-max-price-aria-label $214
Displaying fares for October-2026
  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    28

    Wed

    OCT

  • DEN–ONT: cmp-view-offers-disclaimer. Find Offers
    29

    Thu

  • DEN–ONT, Oct 30, 2026: from $214
    30

    Fri

  • DEN–ONT, Oct 31, 2026: from $214
    31

    Sat

  • DEN–ONT, Nov 1, 2026: from $214
    01

    Sun

    NOV

  • DEN–ONT, Nov 2, 2026: from $214
    02

    Mon

  • DEN–ONT, Nov 3, 2026: from $214
    03

    Tue

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

    Wed

  • DEN–ONT, Nov 5, 2026: from $179
    05

    Thu

  • DEN–ONT, Nov 6, 2026: from $179
    06

    Fri

  • DEN–ONT, Nov 7, 2026: from $139
    07

    Sat

  • DEN–ONT, Nov 8, 2026: from $179
    08

    Sun

  • DEN–ONT, Nov 9, 2026: from $179
    09

    Mon

  • DEN–ONT, Nov 10, 2026: from $139
    10

    Tue

  • DEN–ONT, Nov 11, 2026: from $86
    11

    Wed

  • DEN–ONT, Nov 12, 2026: from $159
    12

    Thu

  • DEN–ONT, Nov 13, 2026: from $136
    13

    Fri

  • DEN–ONT, Nov 14, 2026: from $111
    14

    Sat

  • DEN–ONT, Nov 15, 2026: from $48
    15

    Sun

  • DEN–ONT, Nov 16, 2026: from $91
    16

    Mon

  • DEN–ONT, Nov 17, 2026: from $28
    17

    Tue

  • DEN–ONT, Nov 18, 2026: from $19
    18

    Wed

  • DEN–ONT, Nov 19, 2026: from $29
    19

    Thu

  • DEN–ONT, Nov 20, 2026: from $63
    20

    Fri

  • DEN–ONT, Nov 21, 2026: from $58
    21

    Sat

  • DEN–ONT, Nov 22, 2026: from $53
    22

    Sun

  • DEN–ONT, Nov 23, 2026: from $43
    23

    Mon

  • DEN–ONT, Nov 24, 2026: from $43
    24

    Tue

  • DEN–ONT, Nov 25, 2026: from $20
    25

    Wed

  • DEN–ONT, Nov 26, 2026: from $23
    26

    Thu

  • DEN–ONT, Nov 27, 2026: from $32
    27

    Fri

    • Range$19-$214

    *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 Jan 27, 2027

    From

    $32

    Last seen: 17 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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