Southwest® flights from Portland, OR to Ontario/LA from $96

Promo Code

Low fares from Portland, OR to Ontario/LA

$

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 12/05/2026

One-way

Basic

From
$96
Seen: 19 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 12/14/2026

One-way

Basic

From
$105
Seen: 16 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 12/15/2026

One-way

Basic

From
$105
Seen: 2 minutes ago

Portland, OR (PDX)to

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

One-way

Basic

From
$105
Seen: 6 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 12/08/2026

One-way

Basic

From
$105
Seen: 7 hrs ago

Portland, OR (PDX)to

Ontario/LA (ONT)
Depart: 12/16/2026

One-way

Basic

From
$105
Seen: 32 minutes ago

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Explore flights from Portland, OR to Ontario/LA

Nov 2026
From$233*
Seen: 7 hrs ago
One Way/Basic
Dec 2026
From$96*
Seen: 19 hrs ago
One Way/Basic
Jan 2027
From$105*
Seen: 20 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $96
cmp-daily-histogram-bars-legend-max-price-aria-label $371
Displaying fares for November-2026
  • PDX–ONT, 11/13/2026: From $366
    13

    Fri

    NOV

  • PDX–ONT, 11/14/2026: From $366
    14

    Sat

  • PDX–ONT, 11/15/2026: From $371
    15

    Sun

  • PDX–ONT, 11/16/2026: From $366
    16

    Mon

  • PDX–ONT, 11/17/2026: From $371
    17

    Tue

  • PDX–ONT, 11/18/2026: From $366
    18

    Wed

  • PDX–ONT, 11/19/2026: From $371
    19

    Thu

  • PDX–ONT, 11/20/2026: From $354
    20

    Fri

  • PDX–ONT, 11/21/2026: From $354
    21

    Sat

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

    Sun

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

    Mon

  • PDX–ONT, 11/24/2026: From $354
    24

    Tue

  • PDX–ONT, 11/25/2026: From $354
    25

    Wed

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

    Thu

  • PDX–ONT, 11/27/2026: From $233
    27

    Fri

  • PDX–ONT, 11/28/2026: From $285
    28

    Sat

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

    Sun

  • PDX–ONT, 11/30/2026: From $238
    30

    Mon

  • PDX–ONT, 12/01/2026: From $233
    01

    Tue

    DEC

  • PDX–ONT, 12/02/2026: From $238
    02

    Wed

  • PDX–ONT, 12/03/2026: From $238
    03

    Thu

  • PDX–ONT, 12/04/2026: From $135
    04

    Fri

  • PDX–ONT, 12/05/2026: From $96
    05

    Sat

  • PDX–ONT, 12/06/2026: From $158
    06

    Sun

  • PDX–ONT, 12/07/2026: From $115
    07

    Mon

  • PDX–ONT, 12/08/2026: From $105
    08

    Tue

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

    Wed

  • PDX–ONT, 12/10/2026: From $115
    10

    Thu

  • PDX–ONT, 12/11/2026: From $135
    11

    Fri

  • PDX–ONT, 12/12/2026: From $115
    12

    Sat

    • Range$96-$371

    *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

    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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