Flights from Washington, D.C. to Ontario/LA, CA

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Best Deals on Flights From Washington, D.C. (DCA) to Ontario/LA, CA (ONT)

Try alternate month or interact with individual days below in order to find offers.
Sep 2026
No results for this month.
Oct 2026
from$107*
Last seen: 23 hours ago
One-way/Economy
Nov 2026
from$107*
Last seen: 21 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $182
Displaying fares for September-2026
  • DCA–ONT: cmp-view-offers-disclaimer. Find Offers
    29

    Tue

    SEP

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    30

    Wed

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    01

    Thu

    OCT

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    02

    Fri

  • DCA–ONT, Oct 3, 2026: from $193
    03

    Sat

  • DCA–ONT, Oct 4, 2026: from $257
    04

    Sun

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    05

    Mon

  • DCA–ONT, Oct 6, 2026: from $193
    06

    Tue

  • DCA–ONT, Oct 7, 2026: from $199
    07

    Wed

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    08

    Thu

  • DCA–ONT, Oct 9, 2026: from $251
    09

    Fri

  • DCA–ONT, Oct 10, 2026: from $193
    10

    Sat

  • DCA–ONT, Oct 11, 2026: from $257
    11

    Sun

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    12

    Mon

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    13

    Tue

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    14

    Wed

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    15

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    16

    Fri

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    17

    Sat

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    18

    Sun

  • DCA–ONT, Oct 19, 2026: from $182
    19

    Mon

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    20

    Tue

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    21

    Wed

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    22

    Thu

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    23

    Fri

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    24

    Sat

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    25

    Sun

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    26

    Mon

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    27

    Tue

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    28

    Wed

    • Range$182-$257

    *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 Washington, D.C. to Ontario/LA, CA on Frontier

    $
    *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®.

    Washington, D.C. Ontario/LA, CA

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    Earn up to 60,000 Miles after qualifying activity. Terms apply.