Southwest® flights from Pittsburgh to St. Louis from $104

Promo Code

Low fares from Pittsburgh to St. Louis

$

Pittsburgh (PIT)to

St. Louis (STL)
Depart: 10/24/2026

One-way

Basic

From
$104
Seen: 19 hrs ago

Pittsburgh (PIT)to

St. Louis (STL)
Depart: 11/09/2026

One-way

Basic

From
$104
Seen: 20 hrs ago

Pittsburgh (PIT)to

St. Louis (STL)
Depart: 10/13/2026

One-way

Basic

From
$104
Seen: 5 hrs ago

Pittsburgh (PIT)to

St. Louis (STL)
Depart: 09/23/2026

One-way

Basic

From
$104
Seen: 12 hrs ago

Pittsburgh (PIT)to

St. Louis (STL)
Depart: 11/02/2026

One-way

Basic

From
$104
Seen: 16 hrs ago

Pittsburgh (PIT)to

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

One-way

Basic

From
$104
Seen: 8 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

Aug 2026
From$435*
Seen: 3 hrs ago
One Way/Basic
Sep 2026
From$104*
Seen: 12 hrs ago
One Way/Basic
Oct 2026
From$104*
Seen: 4 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $104
cmp-daily-histogram-bars-legend-max-price-aria-label $513
Displaying fares for August-2026
  • PIT–STL, 08/22/2026: From $513
    22

    Sat

    AUG

  • PIT–STL, 08/23/2026: From $513
    23

    Sun

  • PIT–STL, 08/24/2026: From $513
    24

    Mon

  • PIT–STL, 08/25/2026: From $513
    25

    Tue

  • PIT–STL, 08/26/2026: From $513
    26

    Wed

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

    Thu

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

    Fri

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

    Sat

  • PIT–STL, 08/30/2026: From $435
    30

    Sun

  • PIT–STL, 08/31/2026: From $435
    31

    Mon

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

    Tue

    SEP

  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    02

    Wed

  • PIT–STL, 09/03/2026: From $435
    03

    Thu

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

    Fri

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

    Sat

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

    Sun

  • PIT–STL, 09/07/2026: From $244
    07

    Mon

  • PIT–STL, 09/08/2026: From $225
    08

    Tue

  • PIT–STL, 09/09/2026: From $225
    09

    Wed

  • PIT–STL, 09/10/2026: From $225
    10

    Thu

  • PIT–STL, 09/11/2026: From $124
    11

    Fri

  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    12

    Sat

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

    Sun

  • PIT–STL, 09/14/2026: From $148
    14

    Mon

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

    Tue

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

    Wed

  • PIT–STL, 09/17/2026: From $119
    17

    Thu

  • PIT–STL, 09/18/2026: From $124
    18

    Fri

  • PIT–STL, 09/19/2026: From $104
    19

    Sat

  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    20

    Sun

  • PIT–STL, 09/21/2026: From $114
    21

    Mon

    • Range$104-$513

    *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

    Route Information

    156† Weekly flights
    • 1‡ Nonstop flight per day Monday through Friday
    • 1‡ Nonstop flight on Saturday
    • 2‡ Nonstop flights on Sunday

    † 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

    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