Southwest® flights from Philadelphia to St. Louis from $150

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Low fares from Philadelphia to St. Louis

$

Philadelphia (PHL)to

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

One-way

Basic

From
$150
Seen: 13 hrs ago

Philadelphia (PHL)to

St. Louis (STL)
Depart: 12/08/2026

One-way

Basic

From
$150
Seen: 23 hrs ago

Philadelphia (PHL)to

St. Louis (STL)
Depart: 01/05/2027

One-way

Basic

From
$150
Seen: 7 hrs ago

Philadelphia (PHL)to

St. Louis (STL)
Depart: 12/16/2026

One-way

Basic

From
$150
Seen: 7 hrs ago

Philadelphia (PHL)to

St. Louis (STL)
Depart: 12/19/2026

One-way

Basic

From
$150
Seen: 5 hrs ago

Philadelphia (PHL)to

St. Louis (STL)
Depart: 12/09/2026

One-way

Basic

From
$150
Seen: 1 hour ago

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Explore flights from Philadelphia to St. Louis

Nov 2026
From$319*
Seen: 21 hrs ago
One Way/Basic
Dec 2026
From$150*
Seen: 23 hrs ago
One Way/Basic
Jan 2027
From$150*
Seen: 14 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $150
cmp-daily-histogram-bars-legend-max-price-aria-label $354
Displaying fares for November-2026
  • PHL–STL, 11/11/2026: From $319
    11

    Wed

    NOV

  • PHL–STL, 11/12/2026: From $354
    12

    Thu

  • PHL–STL, 11/13/2026: From $354
    13

    Fri

  • PHL–STL, 11/14/2026: From $319
    14

    Sat

  • PHL–STL, 11/15/2026: From $354
    15

    Sun

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

    Mon

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

    Tue

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

    Wed

  • PHL–STL, 11/19/2026: From $354
    19

    Thu

  • PHL–STL, 11/20/2026: From $354
    20

    Fri

  • PHL–STL, 11/21/2026: From $319
    21

    Sat

  • PHL–STL, 11/22/2026: From $354
    22

    Sun

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

    Mon

  • PHL–STL, 11/24/2026: From $319
    24

    Tue

  • PHL–STL, 11/25/2026: From $319
    25

    Wed

  • PHL–STL, 11/26/2026: From $336
    26

    Thu

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

    Fri

  • PHL–STL, 11/28/2026: From $319
    28

    Sat

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

    Sun

  • PHL–STL, 11/30/2026: From $320
    30

    Mon

  • PHL–STL, 12/01/2026: From $190
    01

    Tue

    DEC

  • PHL–STL, 12/02/2026: From $155
    02

    Wed

  • PHL–STL, 12/03/2026: From $165
    03

    Thu

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

    Fri

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

    Sat

  • PHL–STL, 12/06/2026: From $280
    06

    Sun

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

    Mon

  • PHL–STL, 12/08/2026: From $150
    08

    Tue

  • PHL–STL, 12/09/2026: From $150
    09

    Wed

  • PHL–STL, 12/10/2026: From $165
    10

    Thu

    • Range$150-$354

    *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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