Flights from Ontario/LA, CA to Portland, OR

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Best Deals on Flights From Ontario/LA, CA (ONT) to Portland, OR (PDX)

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Aug 2026
No results for this month.
Sep 2026
from$110*
Last seen: 22 hours ago
One-way/Economy
Oct 2026
from$118*
Last seen: 3 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $110
cmp-daily-histogram-bars-legend-max-price-aria-label $433
Displaying fares for August-2026
  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    30

    Sun

    AUG

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    31

    Mon

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    01

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    SEP

  • ONT–PDX, Sep 2, 2026: from $159
    02

    Wed

  • ONT–PDX, Sep 3, 2026: from $159
    03

    Thu

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

    Fri

  • ONT–PDX, Sep 5, 2026: from $165
    05

    Sat

  • ONT–PDX, Sep 6, 2026: from $149
    06

    Sun

  • ONT–PDX, Sep 7, 2026: from $433
    07

    Mon

  • ONT–PDX, Sep 8, 2026: from $149
    08

    Tue

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    09

    Wed

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    10

    Thu

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    11

    Fri

  • ONT–PDX, Sep 12, 2026: from $149
    12

    Sat

  • ONT–PDX, Sep 13, 2026: from $129
    13

    Sun

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    14

    Mon

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    15

    Tue

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    16

    Wed

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    17

    Thu

  • ONT–PDX, Sep 18, 2026: from $135
    18

    Fri

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    19

    Sat

  • ONT–PDX, Sep 20, 2026: from $110
    20

    Sun

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    21

    Mon

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    22

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    23

    Wed

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    24

    Thu

  • ONT–PDX, Sep 25, 2026: from $110
    25

    Fri

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    26

    Sat

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    27

    Sun

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    28

    Mon

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    29

    Tue

    • Range$110-$433

    *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 Portland, OR on Frontier

    $
    Flights Deals from Ontario/LA, CA to Portland, OR on Frontier
    From
    To
    Ontario/LA, CA (ONT)Portland, OR (PDX)One-way
    /
    Discount Den Basic Fare    		Departing Dec 23, 2026

    From

    $199

    Last seen: 5 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 Portland, OR

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