Southwest® flights from Pittsburgh to St. Louis from $137

Promo Code

Low fares from Pittsburgh to St. Louis

$

Pittsburgh (PIT)to

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

One-way

Basic

From
$137
Seen: 14 hrs ago

Pittsburgh (PIT)to

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

One-way

Basic

From
$137
Seen: 11 hrs ago

Pittsburgh (PIT)to

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

One-way

Basic

From
$137
Seen: 21 hrs ago

Pittsburgh (PIT)to

St. Louis (STL)
Depart: 12/02/2026

One-way

Basic

From
$137
Seen: 22 hrs ago

Pittsburgh (PIT)to

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

One-way

Basic

From
$137
Seen: 19 hrs ago

Pittsburgh (PIT)to

St. Louis (STL)
Depart: 12/15/2026

One-way

Basic

From
$137
Seen: 6 hrs ago

Looking for more low-fare flights?

Check out the Low Fare Calendar to find a fare that works for you. Just choose the month you want to depart and return, and we’ll show you the best fares available.

Find low fares

Explore flights from Pittsburgh to St. Louis

Nov 2026
From$269*
Seen: 8 hrs ago
One Way/Basic
Dec 2026
From$137*
Seen: 22 hrs ago
One Way/Basic
Jan 2027
From$147*
Seen: 23 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $137
cmp-daily-histogram-bars-legend-max-price-aria-label $538
Displaying fares for November-2026
  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    11

    Wed

    NOV

  • PIT–STL, 11/12/2026: From $538
    12

    Thu

  • PIT–STL, 11/13/2026: From $538
    13

    Fri

  • PIT–STL, 11/14/2026: From $538
    14

    Sat

  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    15

    Sun

  • PIT–STL, 11/16/2026: From $538
    16

    Mon

  • PIT–STL, 11/17/2026: From $538
    17

    Tue

  • PIT–STL, 11/18/2026: From $460
    18

    Wed

  • PIT–STL, 11/19/2026: From $460
    19

    Thu

  • PIT–STL, 11/20/2026: From $460
    20

    Fri

  • PIT–STL, 11/21/2026: From $460
    21

    Sat

  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    22

    Sun

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

    Mon

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

    Tue

  • PIT–STL, 11/25/2026: From $269
    25

    Wed

  • PIT–STL, 11/26/2026: From $269
    26

    Thu

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

    Fri

  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    28

    Sat

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

    Sun

  • PIT–STL, 11/30/2026: From $299
    30

    Mon

  • PIT–STL, 12/01/2026: From $269
    01

    Tue

    DEC

  • PIT–STL, 12/02/2026: From $137
    02

    Wed

  • PIT–STL, 12/03/2026: From $157
    03

    Thu

  • PIT–STL, 12/04/2026: From $172
    04

    Fri

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

    Sat

  • PIT–STL, 12/06/2026: From $238
    06

    Sun

  • PIT–STL, 12/07/2026: From $238
    07

    Mon

  • PIT–STL, 12/08/2026: From $137
    08

    Tue

  • PIT–STL, 12/09/2026: From $137
    09

    Wed

  • PIT–STL, 12/10/2026: From $157
    10

    Thu

    • Range$137-$538

    *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:
    Pittsburgh International Airport
    Arriving at:
    Lambert-St Louis Int'l Airport
    Average flight time:
    1 hour 48 minutes
    Distance:
    554 miles

    Questions we hear the most

    The average flight time from Pittsburgh to St. Louis is 1 hour 48 minutes.
    There are 156 weekly flights from Pittsburgh to St. Louis on Southwest Airlines.
    Yes, Southwest flies nonstop from Pittsburgh to St. Louis once per day from Monday through Friday.
    Yes, Southwest flies nonstop from Pittsburgh to St. Louis once per day on Saturdays and 2 times per day on Sundays.
    To find the lowest fares by day and time to fly Pittsburgh 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 Pittsburgh 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.

    Explore Flights from Other Popular Origins

    Popular Flights from Pittsburgh