Southwest® flights from Pittsburgh to St. Louis from $99

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Low fares from Pittsburgh to St. Louis

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Pittsburgh (PIT)to

St. Louis (STL)
Depart: 10/05/2026

One-way

Basic

From
$99
Seen: 17 hrs ago

Pittsburgh (PIT)to

St. Louis (STL)
Depart: 09/28/2026

One-way

Basic

From
$99
Seen: 19 hrs ago

Pittsburgh (PIT)to

St. Louis (STL)
Depart: 09/16/2026

One-way

Basic

From
$99
Seen: 6 hrs ago

Pittsburgh (PIT)to

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

One-way

Basic

From
$99
Seen: 22 hrs ago

Pittsburgh (PIT)to

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

One-way

Basic

From
$99
Seen: 15 hrs ago

Pittsburgh (PIT)to

St. Louis (STL)
Depart: 10/15/2026

One-way

Basic

From
$99
Seen: 23 hrs ago

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Explore flights from Pittsburgh to St. Louis

Aug 2026
From$99*
Seen: 5 hrs ago
One Way/Basic
Sep 2026
From$99*
Seen: 22 hrs ago
One Way/Basic
Oct 2026
From$99*
Seen: 23 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $99
cmp-daily-histogram-bars-legend-max-price-aria-label $513
Displaying fares for August-2026
  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    02

    Sun

    AUG

  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    03

    Mon

  • PIT–STL, 08/04/2026: From $513
    04

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  • PIT–STL, 08/05/2026: From $513
    05

    Wed

  • PIT–STL, 08/06/2026: From $513
    06

    Thu

  • PIT–STL, 08/07/2026: From $435
    07

    Fri

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

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    09

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    10

    Mon

  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    11

    Tue

  • PIT–STL, 08/12/2026: From $435
    12

    Wed

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

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  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    14

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    15

    Sat

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

    Sun

  • PIT–STL, 08/17/2026: From $244
    17

    Mon

  • PIT–STL, 08/18/2026: From $244
    18

    Tue

  • PIT–STL, 08/19/2026: From $244
    19

    Wed

  • PIT–STL, 08/20/2026: From $244
    20

    Thu

  • PIT–STL, 08/21/2026: From $119
    21

    Fri

  • PIT–STL, 08/22/2026: From $99
    22

    Sat

  • PIT–STL, 08/23/2026: From $129
    23

    Sun

  • PIT–STL, 08/24/2026: From $99
    24

    Mon

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

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  • PIT–STL, 08/26/2026: From $99
    26

    Wed

  • PIT–STL, 08/27/2026: From $99
    27

    Thu

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

    Fri

  • PIT–STL, 08/29/2026: From $99
    29

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  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    30

    Sun

  • PIT–STL: cmp-view-offers-disclaimer. Find Offers
    31

    Mon

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

    Tue

    SEP

    • Range$99-$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.

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