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

Promo Code

Low fares from Portland, OR to Ontario/LA

$

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 10/28/2026

One-way

Basic

From
$129
Seen: 7 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 10/20/2026

One-way

Basic

From
$129
Seen: 10 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 11/11/2026

One-way

Basic

From
$134
Seen: 23 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 11/10/2026

One-way

Basic

From
$134
Seen: 5 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 09/26/2026

One-way

Basic

From
$134
Seen: 13 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 10/31/2026

One-way

Basic

From
$134
Seen: 9 hrs ago

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Explore flights from Portland, OR to Ontario/LA

Aug 2026
From$179*
Seen: 19 hrs ago
One Way/Basic
Sep 2026
From$134*
Seen: 13 hrs ago
One Way/Basic
Oct 2026
From$129*
Seen: 10 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
  • PDX–ONT, 08/23/2026: From $235
    23

    Sun

    AUG

  • PDX–ONT, 08/24/2026: From $235
    24

    Mon

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

    Tue

  • PDX–ONT, 08/26/2026: From $235
    26

    Wed

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

    Thu

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

    Fri

  • PDX–ONT: cmp-view-offers-disclaimer. Find Offers
    29

    Sat

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    30

    Sun

  • PDX–ONT, 08/31/2026: From $179
    31

    Mon

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

    Tue

    SEP

  • PDX–ONT, 09/02/2026: From $179
    02

    Wed

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    03

    Thu

  • PDX–ONT, 09/04/2026: From $179
    04

    Fri

  • PDX–ONT, 09/05/2026: From $149
    05

    Sat

  • PDX–ONT, 09/06/2026: From $149
    06

    Sun

  • PDX–ONT: cmp-view-offers-disclaimer. Find Offers
    07

    Mon

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    08

    Tue

  • PDX–ONT: cmp-view-offers-disclaimer. Find Offers
    09

    Wed

  • PDX–ONT, 09/10/2026: From $149
    10

    Thu

  • PDX–ONT, 09/11/2026: From $149
    11

    Fri

  • PDX–ONT, 09/12/2026: From $145
    12

    Sat

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

    Sun

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

    Mon

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

    Tue

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

    Wed

  • PDX–ONT, 09/17/2026: From $145
    17

    Thu

  • PDX–ONT, 09/18/2026: From $145
    18

    Fri

  • PDX–ONT, 09/19/2026: From $145
    19

    Sat

  • PDX–ONT: cmp-view-offers-disclaimer. Find Offers
    20

    Sun

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

    Mon

  • PDX–ONT, 09/22/2026: From $134
    22

    Tue

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

    Route Information

    147† 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 147 weekly flights from Portland, OR to Ontario/LA on Southwest Airlines.
    To find the lowest fares by day and time to fly Portland, OR to Ontario/LA with Southwest, check out our Low Fare Calendar.
    You can rent a car at LA/Ontario International Airport book yours with your flight.
    Yes! Flights from Portland, OR to Ontario/LA—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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