Southwest® flights from Ontario/LA to Philadelphia from $185

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Low fares from Ontario/LA to Philadelphia

$

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 11/06/2026

One-way

Basic

From
$185
Seen: 23 hrs ago

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 12/10/2026

One-way

Basic

From
$185
Seen: 21 hrs ago

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 11/02/2026

One-way

Basic

From
$185
Seen: 13 hrs ago

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 10/26/2026

One-way

Basic

From
$185
Seen: 2 hrs ago

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 10/21/2026

One-way

Basic

From
$185
Seen: 21 hrs ago

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 10/03/2026

One-way

Basic

From
$185
Seen: 18 hrs ago

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Explore flights from Ontario/LA to Philadelphia

Sep 2026
From$275*
Seen: 3 hrs ago
One Way/Basic
Oct 2026
From$185*
Seen: 21 hrs ago
One Way/Basic
Nov 2026
From$185*
Seen: 23 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $185
cmp-daily-histogram-bars-legend-max-price-aria-label $363
Displaying fares for September-2026
  • ONT–PHL, 09/11/2026: From $363
    11

    Fri

    SEP

  • ONT–PHL, 09/12/2026: From $275
    12

    Sat

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

    Sun

  • ONT–PHL, 09/14/2026: From $363
    14

    Mon

  • ONT–PHL, 09/15/2026: From $275
    15

    Tue

  • ONT–PHL, 09/16/2026: From $280
    16

    Wed

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

    Thu

  • ONT–PHL: cmp-view-offers-disclaimer. Find Offers
    18

    Fri

  • ONT–PHL, 09/19/2026: From $275
    19

    Sat

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

    Sun

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

    Mon

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

    Tue

  • ONT–PHL, 09/23/2026: From $275
    23

    Wed

  • ONT–PHL, 09/24/2026: From $309
    24

    Thu

  • ONT–PHL, 09/25/2026: From $304
    25

    Fri

  • ONT–PHL, 09/26/2026: From $275
    26

    Sat

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

    Sun

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

    Mon

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

    Tue

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

    Wed

  • ONT–PHL, 10/01/2026: From $195
    01

    Thu

    OCT

  • ONT–PHL, 10/02/2026: From $195
    02

    Fri

  • ONT–PHL, 10/03/2026: From $185
    03

    Sat

  • ONT–PHL, 10/04/2026: From $240
    04

    Sun

  • ONT–PHL, 10/05/2026: From $195
    05

    Mon

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

    Tue

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

    Wed

  • ONT–PHL: cmp-view-offers-disclaimer. Find Offers
    08

    Thu

  • ONT–PHL, 10/09/2026: From $185
    09

    Fri

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

    Sat

    • Range$185-$363

    *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:
    Philadelphia International Airport
    Distance:
    2356 miles

    Route Information

    78† 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 78 weekly flights from Ontario/LA to Philadelphia on Southwest Airlines.
    To find the lowest fares by day and time to fly Ontario/LA to Philadelphia with Southwest, check out our Low Fare Calendar.
    You can rent a car at Philadelphia International Airport book yours with your flight.
    Yes! Flights from Ontario/LA to Philadelphia—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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