Southwest® flights from Ontario/LA to Portland, OR from $129

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Low fares from Ontario/LA to Portland, OR

$

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 10/13/2026

One-way

Basic

From
$129
Seen: 57 minutes ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 10/06/2026

One-way

Basic

From
$129
Seen: 15 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 10/07/2026

One-way

Basic

From
$129
Seen: 2 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 10/14/2026

One-way

Basic

From
$129
Seen: 13 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 10/03/2026

One-way

Basic

From
$134
Seen: 23 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 09/22/2026

One-way

Basic

From
$134
Seen: 12 hrs ago

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Explore flights from Ontario/LA to Portland, OR

Aug 2026
From$179*
Seen: 14 hrs ago
One Way/Basic
Sep 2026
From$134*
Seen: 12 hrs ago
One Way/Basic
Oct 2026
From$129*
Seen: 13 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $134
cmp-daily-histogram-bars-legend-max-price-aria-label $235
Displaying fares for August-2026
  • ONT–PDX, 08/21/2026: From $235
    21

    Fri

    AUG

  • ONT–PDX, 08/22/2026: From $235
    22

    Sat

  • ONT–PDX, 08/23/2026: From $235
    23

    Sun

  • ONT–PDX, 08/24/2026: From $230
    24

    Mon

  • ONT–PDX, 08/25/2026: From $235
    25

    Tue

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    26

    Wed

  • ONT–PDX, 08/27/2026: From $179
    27

    Thu

  • ONT–PDX, 08/28/2026: From $179
    28

    Fri

  • ONT–PDX, 08/29/2026: From $179
    29

    Sat

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    30

    Sun

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    31

    Mon

  • ONT–PDX, 09/01/2026: From $179
    01

    Tue

    SEP

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    02

    Wed

  • ONT–PDX, 09/03/2026: From $205
    03

    Thu

  • ONT–PDX, 09/04/2026: From $230
    04

    Fri

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    05

    Sat

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

    Sun

  • ONT–PDX, 09/07/2026: From $214
    07

    Mon

  • ONT–PDX, 09/08/2026: From $149
    08

    Tue

  • ONT–PDX, 09/09/2026: From $149
    09

    Wed

  • ONT–PDX, 09/10/2026: From $139
    10

    Thu

  • ONT–PDX, 09/11/2026: From $144
    11

    Fri

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    12

    Sat

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

    Sun

  • ONT–PDX, 09/14/2026: From $134
    14

    Mon

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    15

    Tue

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    16

    Wed

  • ONT–PDX, 09/17/2026: From $139
    17

    Thu

  • ONT–PDX, 09/18/2026: From $149
    18

    Fri

  • ONT–PDX, 09/19/2026: From $134
    19

    Sat

  • ONT–PDX, 09/20/2026: From $170
    20

    Sun

    • Range$134-$235

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    LA/Ontario International Airport
    Arriving at:
    Portland International Airport
    Distance:
    838 miles

    Route Information

    153† Weekly flights

    † Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.

    ‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.

    Questions we hear the most

    There are 153 weekly flights from Ontario/LA to Portland, OR on Southwest Airlines.
    To find the lowest fares by day and time to fly Ontario/LA to Portland, OR with Southwest, check out our Low Fare Calendar.
    You can rent a car at Portland International Airport book yours with your flight.
    Yes! Flights from Ontario/LA to Portland, OR—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

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