Southwest® flights from Portland, OR to Ontario/LA from $73

Promo Code

Low fares from Portland, OR to Ontario/LA

$

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 10/27/2026

One-way

Basic

From
$73
Seen: 20 hrs ago

Portland, OR (PDX)to

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

One-way

Basic

From
$73
Seen: 5 minutes ago

Portland, OR (PDX)to

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

One-way

Basic

From
$73
Seen: 18 hrs ago

Portland, OR (PDX)to

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

One-way

Basic

From
$78
Seen: 7 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 12/22/2026

One-way

Basic

From
$78
Seen: 14 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 11/04/2026

One-way

Basic

From
$78
Seen: 17 hrs ago

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Explore flights from Portland, OR to Ontario/LA

Oct 2026
From$73*
Seen: 5 minutes ago
One Way/Basic
Nov 2026
From$78*
Seen: 17 hrs ago
One Way/Basic
Dec 2026
From$78*
Seen: 7 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $73
cmp-daily-histogram-bars-legend-max-price-aria-label $394
Displaying fares for October-2026
  • PDX–ONT: cmp-view-offers-disclaimer. Find Offers
    03

    Sat

    OCT

  • PDX–ONT, 10/04/2026: From $394
    04

    Sun

  • PDX–ONT, 10/05/2026: From $394
    05

    Mon

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

    Tue

  • PDX–ONT, 10/07/2026: From $389
    07

    Wed

  • PDX–ONT, 10/08/2026: From $394
    08

    Thu

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

    Fri

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

    Sat

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

    Sun

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

    Mon

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

    Tue

  • PDX–ONT, 10/14/2026: From $329
    14

    Wed

  • PDX–ONT, 10/15/2026: From $334
    15

    Thu

  • PDX–ONT, 10/16/2026: From $334
    16

    Fri

  • PDX–ONT, 10/17/2026: From $138
    17

    Sat

  • PDX–ONT, 10/18/2026: From $254
    18

    Sun

  • PDX–ONT, 10/19/2026: From $138
    19

    Mon

  • PDX–ONT, 10/20/2026: From $73
    20

    Tue

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

    Wed

  • PDX–ONT, 10/22/2026: From $93
    22

    Thu

  • PDX–ONT, 10/23/2026: From $194
    23

    Fri

  • PDX–ONT, 10/24/2026: From $98
    24

    Sat

  • PDX–ONT, 10/25/2026: From $194
    25

    Sun

  • PDX–ONT, 10/26/2026: From $88
    26

    Mon

  • PDX–ONT, 10/27/2026: From $73
    27

    Tue

  • PDX–ONT, 10/28/2026: From $73
    28

    Wed

  • PDX–ONT, 10/29/2026: From $88
    29

    Thu

  • PDX–ONT, 10/30/2026: From $194
    30

    Fri

  • PDX–ONT, 10/31/2026: From $88
    31

    Sat

  • PDX–ONT, 11/01/2026: From $194
    01

    Sun

    NOV

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

    Mon

    • Range$73-$394

    *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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