Southwest® flights from Ontario/LA to Portland, OR from $134

Promo Code

Low fares from Ontario/LA to Portland, OR

$

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 10/20/2026

One-way

Basic

From
$134
Seen: 17 hrs ago

Ontario/LA (ONT)to

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

One-way

Basic

From
$134
Seen: 15 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 11/07/2026

One-way

Basic

From
$139
Seen: 3 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 11/03/2026

One-way

Basic

From
$139
Seen: 5 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 12/05/2026

One-way

Basic

From
$139
Seen: 5 hrs ago

Ontario/LA (ONT)to

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

One-way

Basic

From
$140
Seen: 21 hrs ago

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Explore flights from Ontario/LA to Portland, OR

Sep 2026
From$145*
Seen: 1 hour ago
One Way/Basic
Oct 2026
From$134*
Seen: 17 hrs ago
One Way/Basic
Nov 2026
From$139*
Seen: 5 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $140
cmp-daily-histogram-bars-legend-max-price-aria-label $235
Displaying fares for September-2026
  • ONT–PDX, 09/11/2026: From $235
    11

    Fri

    SEP

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

    Sat

  • ONT–PDX, 09/13/2026: From $235
    13

    Sun

  • ONT–PDX, 09/14/2026: From $230
    14

    Mon

  • ONT–PDX, 09/15/2026: From $235
    15

    Tue

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

    Wed

  • ONT–PDX, 09/17/2026: From $179
    17

    Thu

  • ONT–PDX, 09/18/2026: From $179
    18

    Fri

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    19

    Sat

  • ONT–PDX, 09/20/2026: From $179
    20

    Sun

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    21

    Mon

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    22

    Tue

  • ONT–PDX, 09/23/2026: From $149
    23

    Wed

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    24

    Thu

  • ONT–PDX, 09/25/2026: From $149
    25

    Fri

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

    Sat

  • ONT–PDX, 09/27/2026: From $159
    27

    Sun

  • ONT–PDX, 09/28/2026: From $149
    28

    Mon

  • ONT–PDX, 09/29/2026: From $149
    29

    Tue

  • ONT–PDX, 09/30/2026: From $145
    30

    Wed

  • ONT–PDX, 10/01/2026: From $145
    01

    Thu

    OCT

  • ONT–PDX, 10/02/2026: From $145
    02

    Fri

  • ONT–PDX, 10/03/2026: From $145
    03

    Sat

  • ONT–PDX, 10/04/2026: From $184
    04

    Sun

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

    Mon

  • ONT–PDX, 10/06/2026: From $140
    06

    Tue

  • ONT–PDX, 10/07/2026: From $140
    07

    Wed

  • ONT–PDX, 10/08/2026: From $145
    08

    Thu

  • ONT–PDX, 10/09/2026: From $145
    09

    Fri

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    10

    Sat

    • Range$140-$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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