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

Promo Code

Low fares from St. Louis to Pittsburgh

$

St. Louis (STL)to

Pittsburgh (PIT)
Depart: 08/29/2026

One-way

Basic

From
$99
Seen: 9 hrs ago

St. Louis (STL)to

Pittsburgh (PIT)
Depart: 10/10/2026

One-way

Basic

From
$99
Seen: 6 hrs ago

St. Louis (STL)to

Pittsburgh (PIT)
Depart: 09/07/2026

One-way

Basic

From
$99
Seen: 1 hour ago

St. Louis (STL)to

Pittsburgh (PIT)
Depart: 08/27/2026

One-way

Basic

From
$99
Seen: 1 hour ago

St. Louis (STL)to

Pittsburgh (PIT)
Depart: 10/15/2026

One-way

Basic

From
$99
Seen: 44 minutes ago

St. Louis (STL)to

Pittsburgh (PIT)
Depart: 09/22/2026

One-way

Basic

From
$99
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 St. Louis to Pittsburgh

Aug 2026
From$99*
Seen: 9 hrs ago
One Way/Basic
Sep 2026
From$99*
Seen: 6 hrs ago
One Way/Basic
Oct 2026
From$99*
Seen: 18 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
  • STL–PIT, 08/03/2026: From $508
    03

    Mon

    AUG

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

    Tue

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

    Wed

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

    Thu

  • STL–PIT, 08/07/2026: From $513
    07

    Fri

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

    Sat

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

    Sun

  • STL–PIT: cmp-view-offers-disclaimer. Find Offers
    10

    Mon

  • STL–PIT, 08/11/2026: From $435
    11

    Tue

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

    Wed

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

    Thu

  • STL–PIT, 08/14/2026: From $435
    14

    Fri

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

    Sat

  • STL–PIT, 08/16/2026: From $244
    16

    Sun

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

    Mon

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

    Tue

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

    Wed

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

    Thu

  • STL–PIT, 08/21/2026: From $244
    21

    Fri

  • STL–PIT, 08/22/2026: From $244
    22

    Sat

  • STL–PIT, 08/23/2026: From $160
    23

    Sun

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

    Mon

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

    Tue

  • STL–PIT: cmp-view-offers-disclaimer. Find Offers
    26

    Wed

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

    Thu

  • STL–PIT, 08/28/2026: From $119
    28

    Fri

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

    Sat

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

    Sun

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

    Mon

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

    Tue

    SEP

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

    Wed

    • 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:
    Lambert-St Louis Int'l Airport
    Arriving at:
    Pittsburgh International Airport
    Average flight time:
    1 hour 35 minutes
    Distance:
    554 miles

    Route Information

    153† 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 St. Louis to Pittsburgh is 1 hour 35 minutes.
    There are 153 weekly flights from St. Louis to Pittsburgh on Southwest Airlines.
    Yes, Southwest flies nonstop from St. Louis to Pittsburgh once per day from Monday through Friday.
    Yes, Southwest flies nonstop from St. Louis to Pittsburgh once per day on Saturdays and 2 times per day on Sundays.
    To find the lowest fares by day and time to fly St. Louis to Pittsburgh with Southwest, check out our Low Fare Calendar.
    You can rent a car at Pittsburgh International Airport book yours with your flight.
    Yes! Flights from St. Louis to Pittsburgh—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 St. Louis