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: 12/03/2026

One-way

Basic

From
$185
Seen: 5 hrs ago

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 11/18/2026

One-way

Basic

From
$185
Seen: 7 hrs ago

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 12/15/2026

One-way

Basic

From
$185
Seen: 1 hour ago

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 11/26/2026

One-way

Basic

From
$185
Seen: 21 hrs ago

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 11/09/2026

One-way

Basic

From
$185
Seen: 19 hrs ago

Ontario/LA (ONT)to

Philadelphia (PHL)
Depart: 11/11/2026

One-way

Basic

From
$185
Seen: 11 hrs ago

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Explore flights from Ontario/LA to Philadelphia

Sep 2026
From$285*
Seen: 8 hrs ago
One Way/Basic
Oct 2026
From$185*
Seen: 3 hrs ago
One Way/Basic
Nov 2026
From$185*
Seen: 18 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $185
cmp-daily-histogram-bars-legend-max-price-aria-label $373
Displaying fares for September-2026
  • ONT–PHL, 09/30/2026: From $285
    30

    Wed

    SEP

  • ONT–PHL, 10/01/2026: From $373
    01

    Thu

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

    Fri

  • ONT–PHL: cmp-view-offers-disclaimer. Find Offers
    03

    Sat

  • ONT–PHL: cmp-view-offers-disclaimer. Find Offers
    04

    Sun

  • ONT–PHL, 10/05/2026: From $373
    05

    Mon

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

    Tue

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

    Wed

  • ONT–PHL, 10/08/2026: From $373
    08

    Thu

  • ONT–PHL, 10/09/2026: From $373
    09

    Fri

  • ONT–PHL, 10/10/2026: From $285
    10

    Sat

  • ONT–PHL: cmp-view-offers-disclaimer. Find Offers
    11

    Sun

  • ONT–PHL: cmp-view-offers-disclaimer. Find Offers
    12

    Mon

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

    Tue

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

    Wed

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

    Thu

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

    Fri

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

    Sat

  • ONT–PHL, 10/18/2026: From $314
    18

    Sun

  • ONT–PHL, 10/19/2026: From $314
    19

    Mon

  • ONT–PHL, 10/20/2026: From $185
    20

    Tue

  • ONT–PHL, 10/21/2026: From $190
    21

    Wed

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

    Thu

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

    Fri

  • ONT–PHL, 10/24/2026: From $185
    24

    Sat

  • ONT–PHL, 10/25/2026: From $260
    25

    Sun

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

    Mon

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

    Tue

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

    Wed

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

    Thu

    • Range$185-$373

    *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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