Southwest® flights from Philadelphia to St. Louis from $131

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Low fares from Philadelphia to St. Louis

$

Philadelphia (PHL)to

St. Louis (STL)
Depart: 11/12/2026

One-way

Basic

From
$131
Seen: 9 hrs ago

Philadelphia (PHL)to

St. Louis (STL)
Depart: 01/29/2027

One-way

Basic

From
$131
Seen: 17 hrs ago

Philadelphia (PHL)to

St. Louis (STL)
Depart: 12/07/2026

One-way

Basic

From
$131
Seen: 16 hrs ago

Philadelphia (PHL)to

St. Louis (STL)
Depart: 11/18/2026

One-way

Basic

From
$131
Seen: 12 hrs ago

Philadelphia (PHL)to

St. Louis (STL)
Depart: 11/11/2026

One-way

Basic

From
$131
Seen: 19 hrs ago

Philadelphia (PHL)to

St. Louis (STL)
Depart: 01/27/2027

One-way

Basic

From
$131
Seen: 19 hrs ago

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Explore flights from Philadelphia to St. Louis

Oct 2026
From$314*
Seen: 1 hour ago
One Way/Basic
Nov 2026
From$131*
Seen: 5 hrs ago
One Way/Basic
Dec 2026
From$131*
Seen: 15 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $131
cmp-daily-histogram-bars-legend-max-price-aria-label $385
Displaying fares for October-2026
  • PHL–STL, 10/22/2026: From $385
    22

    Thu

    OCT

  • PHL–STL, 10/23/2026: From $349
    23

    Fri

  • PHL–STL: cmp-view-offers-disclaimer. Find Offers
    24

    Sat

  • PHL–STL: cmp-view-offers-disclaimer. Find Offers
    25

    Sun

  • PHL–STL, 10/26/2026: From $349
    26

    Mon

  • PHL–STL, 10/27/2026: From $324
    27

    Tue

  • PHL–STL, 10/28/2026: From $314
    28

    Wed

  • PHL–STL, 10/29/2026: From $349
    29

    Thu

  • PHL–STL, 10/30/2026: From $349
    30

    Fri

  • PHL–STL, 10/31/2026: From $314
    31

    Sat

  • PHL–STL: cmp-view-offers-disclaimer. Find Offers
    01

    Sun

    NOV

  • PHL–STL, 11/02/2026: From $349
    02

    Mon

  • PHL–STL, 11/03/2026: From $314
    03

    Tue

  • PHL–STL, 11/04/2026: From $314
    04

    Wed

  • PHL–STL: cmp-view-offers-disclaimer. Find Offers
    05

    Thu

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

    Fri

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

    Sat

  • PHL–STL, 11/08/2026: From $331
    08

    Sun

  • PHL–STL: cmp-view-offers-disclaimer. Find Offers
    09

    Mon

  • PHL–STL, 11/10/2026: From $131
    10

    Tue

  • PHL–STL, 11/11/2026: From $131
    11

    Wed

  • PHL–STL, 11/12/2026: From $131
    12

    Thu

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

    Fri

  • PHL–STL, 11/14/2026: From $131
    14

    Sat

  • PHL–STL, 11/15/2026: From $131
    15

    Sun

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

    Mon

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

    Tue

  • PHL–STL, 11/18/2026: From $131
    18

    Wed

  • PHL–STL, 11/19/2026: From $275
    19

    Thu

  • PHL–STL, 11/20/2026: From $179
    20

    Fri

  • PHL–STL, 11/21/2026: From $141
    21

    Sat

    • Range$131-$385

    *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:
    Philadelphia International Airport
    Arriving at:
    Lambert-St Louis Int'l Airport
    Average flight time:
    2 hours 27 minutes
    Distance:
    814 miles

    Questions we hear the most

    The average flight time from Philadelphia to St. Louis is 2 hours 27 minutes.
    There are 147 weekly flights from Philadelphia to St. Louis on Southwest Airlines.
    Yes, Southwest flies nonstop from Philadelphia to St. Louis 2 times per day from Monday through Friday.
    Yes, Southwest flies nonstop from Philadelphia to St. Louis once per day on Saturdays and 3 times per day on Sundays.
    To find the lowest fares by day and time to fly Philadelphia to St. Louis with Southwest, check out our Low Fare Calendar.
    You can rent a car at Lambert-St Louis Int'l Airport book yours with your flight.
    Yes! Flights from Philadelphia to St. Louis—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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