Southwest® flights from Ontario/LA to Portland, OR from $139

Promo Code

Low fares from Ontario/LA to Portland, OR

$

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 12/08/2026

One-way

Basic

From
$139
Seen: 20 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 11/10/2026

One-way

Basic

From
$139
Seen: 23 hrs ago

Ontario/LA (ONT)to

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

One-way

Basic

From
$139
Seen: 23 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 10/31/2026

One-way

Basic

From
$139
Seen: 5 hrs ago

Ontario/LA (ONT)to

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

One-way

Basic

From
$139
Seen: 16 hrs ago

Ontario/LA (ONT)to

Portland, OR (PDX)
Depart: 11/18/2026

One-way

Basic

From
$139
Seen: 13 hrs ago

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Explore flights from Ontario/LA to Portland, OR

Oct 2026
From$139*
Seen: 5 hrs ago
One Way/Basic
Nov 2026
From$139*
Seen: 16 hrs ago
One Way/Basic
Dec 2026
From$139*
Seen: 20 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $139
cmp-daily-histogram-bars-legend-max-price-aria-label $346
Displaying fares for October-2026
  • ONT–PDX, 10/01/2026: From $346
    01

    Thu

    OCT

  • ONT–PDX, 10/02/2026: From $346
    02

    Fri

  • ONT–PDX, 10/03/2026: From $346
    03

    Sat

  • ONT–PDX, 10/04/2026: From $346
    04

    Sun

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

    Mon

  • ONT–PDX, 10/06/2026: From $341
    06

    Tue

  • ONT–PDX, 10/07/2026: From $329
    07

    Wed

  • ONT–PDX, 10/08/2026: From $334
    08

    Thu

  • ONT–PDX, 10/09/2026: From $334
    09

    Fri

  • ONT–PDX, 10/10/2026: From $334
    10

    Sat

  • ONT–PDX, 10/11/2026: From $334
    11

    Sun

  • ONT–PDX, 10/12/2026: From $334
    12

    Mon

  • ONT–PDX, 10/13/2026: From $329
    13

    Tue

  • ONT–PDX, 10/14/2026: From $208
    14

    Wed

  • ONT–PDX, 10/15/2026: From $213
    15

    Thu

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

    Fri

  • ONT–PDX: cmp-view-offers-disclaimer. Find Offers
    17

    Sat

  • ONT–PDX, 10/18/2026: From $218
    18

    Sun

  • ONT–PDX, 10/19/2026: From $213
    19

    Mon

  • ONT–PDX, 10/20/2026: From $208
    20

    Tue

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

    Wed

  • ONT–PDX, 10/22/2026: From $155
    22

    Thu

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

    Fri

  • ONT–PDX, 10/24/2026: From $155
    24

    Sat

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

    Sun

  • ONT–PDX, 10/26/2026: From $155
    26

    Mon

  • ONT–PDX, 10/27/2026: From $150
    27

    Tue

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

    Wed

  • ONT–PDX, 10/29/2026: From $155
    29

    Thu

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

    Fri

  • ONT–PDX, 10/31/2026: From $139
    31

    Sat

    • Range$139-$346

    *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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