Southwest® flights from Ontario/LA to Portland, OR from $124

Promo Code

Low fares from Ontario/LA to Portland, OR

$

Ontario/LA (ONT)to

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

One-way

Basic

From
$124
Seen: 19 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 09/16/2026

One-way

Basic

From
$129
Seen: 9 hrs ago

Ontario/LA (ONT)to

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

One-way

Basic

From
$129
Seen: 10 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 09/01/2026

One-way

Basic

From
$129
Seen: 20 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 10/17/2026

One-way

Basic

From
$129
Seen: 18 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 09/19/2026

One-way

Basic

From
$129
Seen: 7 hrs ago

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Explore flights from Ontario/LA to Portland, OR

Try alternate month or interact with individual days below in order to find offers.
Jul 2026
No result for this month.
Aug 2026
From$130*
Seen: 19 hrs ago
One Way/Basic
Sep 2026
From$129*
Seen: 20 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $134
cmp-daily-histogram-bars-legend-max-price-aria-label $225
Displaying fares for July-2026
  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    31

    Fri

    JUL

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    01

    Sat

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

    Sun

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    03

    Mon

  • ONT–PDX, 08/04/2026: From $225
    04

    Tue

  • ONT–PDX, 08/05/2026: From $225
    05

    Wed

  • ONT–PDX, 08/06/2026: From $169
    06

    Thu

  • ONT–PDX, 08/07/2026: From $169
    07

    Fri

  • ONT–PDX, 08/08/2026: From $169
    08

    Sat

  • ONT–PDX, 08/09/2026: From $169
    09

    Sun

  • ONT–PDX, 08/10/2026: From $164
    10

    Mon

  • ONT–PDX, 08/11/2026: From $169
    11

    Tue

  • ONT–PDX, 08/12/2026: From $169
    12

    Wed

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

    Thu

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

    Fri

  • ONT–PDX, 08/15/2026: From $139
    15

    Sat

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

    Sun

  • ONT–PDX, 08/17/2026: From $134
    17

    Mon

  • ONT–PDX, 08/18/2026: From $139
    18

    Tue

  • ONT–PDX, 08/19/2026: From $139
    19

    Wed

  • ONT–PDX, 08/20/2026: From $154
    20

    Thu

  • ONT–PDX, 08/21/2026: From $135
    21

    Fri

  • ONT–PDX, 08/22/2026: From $135
    22

    Sat

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    23

    Sun

  • ONT–PDX, 08/24/2026: From $135
    24

    Mon

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    25

    Tue

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

    Wed

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

    Thu

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    28

    Fri

  • ONT–PDX, 08/29/2026: From $135
    29

    Sat

  • ONT–PDX, 08/30/2026: From $135
    30

    Sun

    • Range$134-$225

    *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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