$91 Cheap Flights from St. Louis (STL) to Pittsburgh (PIT)

View $91 flight on Tue, Aug 12, 2025Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT)

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Cheap Flights from St. Louis to Pittsburgh (STL-PIT)

Prices were available within the past 7 days and start at $91 for one-way flights and $171 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, Aug 13 - Sat, Aug 16
STL
St. Louis
PIT
Pittsburgh
$171 Roundtrip, found 19 hours ago
$171
Roundtrip
found 19 hours ago
Select American Airlines flight, departing Wed, Aug 13 from St. Louis to Pittsburgh, returning Sat, Aug 16, priced at $171 found 19 hours ago
American Airlines
Mon, Aug 25 - Wed, Aug 27
STL
St. Louis
PIT
Pittsburgh
$177 Roundtrip, found 12 hours ago
$177
Roundtrip
found 12 hours ago
Select American Airlines flight, departing Mon, Aug 25 from St. Louis to Pittsburgh, returning Wed, Aug 27, priced at $177 found 12 hours ago
American Airlines
Thu, Aug 21 - Mon, Aug 25
STL
St. Louis
PIT
Pittsburgh
$183 Roundtrip, found 7 hours ago
$183
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Thu, Aug 21 from St. Louis to Pittsburgh, returning Mon, Aug 25, priced at $183 found 7 hours ago
Southwest Airlines
Mon, Aug 25 - Wed, Aug 27
STL
St. Louis
PIT
Pittsburgh
$184 Roundtrip, found 12 hours ago
$184
Roundtrip
found 12 hours ago
Select Southwest Airlines flight, departing Mon, Aug 25 from St. Louis to Pittsburgh, returning Wed, Aug 27, priced at $184 found 12 hours ago
American Airlines
Sat, Aug 30 - Tue, Sep 2
STL
St. Louis
PIT
Pittsburgh
$189 Roundtrip, found 10 hours ago
$189
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Sat, Aug 30 from St. Louis to Pittsburgh, returning Tue, Sep 2, priced at $189 found 10 hours ago
American Airlines
Sat, Aug 30 - Tue, Sep 2
STL
St. Louis
PIT
Pittsburgh
$191 Roundtrip, found 10 hours ago
$191
Roundtrip
found 10 hours ago
Select American Airlines flight, departing Sat, Aug 30 from St. Louis to Pittsburgh, returning Tue, Sep 2, priced at $191 found 10 hours ago
Southwest Airlines
Mon, Aug 25 - Wed, Aug 27
STL
St. Louis
PIT
Pittsburgh
$194 Roundtrip, found 12 hours ago
$194
Roundtrip
found 12 hours ago
Select Southwest Airlines flight, departing Mon, Aug 25 from St. Louis to Pittsburgh, returning Wed, Aug 27, priced at $194 found 12 hours ago
American Airlines
Thu, Aug 21 - Mon, Aug 25
STL
St. Louis
PIT
Pittsburgh
$195 Roundtrip, found 7 hours ago
$195
Roundtrip
found 7 hours ago
Select American Airlines flight, departing Thu, Aug 21 from St. Louis to Pittsburgh, returning Mon, Aug 25, priced at $195 found 7 hours ago
United
Mon, Oct 6 - Tue, Oct 7
STL
St. Louis
PIT
Pittsburgh
$202 Roundtrip, found 2 days ago
$202
Roundtrip
found 2 days ago
Select United flight, departing Mon, Oct 6 from St. Louis to Pittsburgh, returning Tue, Oct 7, priced at $202 found 2 days ago
Delta
Tue, Oct 21 - Wed, Oct 29
STL
St. Louis
PIT
Pittsburgh
$207 Roundtrip, found 6 hours ago
$207
Roundtrip
found 6 hours ago
Select Delta flight, departing Tue, Oct 21 from St. Louis to Pittsburgh, returning Wed, Oct 29, priced at $207 found 6 hours ago

Find the cheapest month to fly from St. Louis (STL) to Pittsburgh (PIT)

September is typically the cheapest month to fly

From $151 - $695 per traveler.

Graph displaying average flight prices per month

Flights from St. Louis (STL) to Pittsburgh (PIT)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Pittsburgh Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$171
Distance
551 mi
Average flight time
2 hours 35 mins

St. Louis to Pittsburgh Flights

The cheapest times to fly from St. Louis to Pittsburgh

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Pittsburgh are during the month of August. You can find some of the cheapest flights from St. Louis to Pittsburgh with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Pittsburgh

Sunday is one of the best days to book for cheap flights from St. Louis to Pittsburgh: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Pittsburgh

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Pittsburgh in 2025. You can also book with separate airlines for your outbound and return journeys, from $91 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Pittsburgh flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Pittsburgh airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT) cost?
Find affordable return tickets from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT) starting at $197. Book a seat and be on your way. This information is based on the cheapest price found on Expedia for this return journey departing within the next three months. This airfare is for a Southwest Airlines flight leaving STL on July 19 2025 and touching down at PIT. The price was last updated on June 30 2025 and has not changed since.
What is the cheapest month to fly from STL to PIT?
The cheapest flights from STL to PIT are usually during off-peak season, when demand is lower. To save money, avoid flying during public holidays, school breaks and major local events.
Which airlines fly direct from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT)?
Take a direct flight with Southwest Airlines and go straight from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT).
What is the cheapest airline that flies from STL to PIT?
At the moment, the cheapest airline offering one-way flights from STL to PIT is Southwest Airlines. You can take off on this route from $99. This fare is based on the lowest price found on Expedia departing within the next three months. The flight takes off from STL on September 25 2025. Prices were last updated on June 30 2025 and have not changed since.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT)?
On average, you can pick from 6 direct weekly flights from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT). For more flexibility, consider flights with layovers. Just enter your details on Expedia and then filter your search to show one stop or more.
What are the most popular departure times for flights from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT)?
More people fly between STL and PIT at 6 PM than at any other point in the day. Prefer a quieter experience? Pick a flight outside the busiest times and there's a chance you'll save on your ticket as well.
What day of the week has the most flights from STL to PIT?
If you depart on a Friday, you'll get the greatest range of choices for flights from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT).
What is the earliest flight from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT)?
The earliest flight leaving from Lambert-St. Louis Intl. Airport (STL) is at around 8:20AM UTC-6. Catch this flight and you'll land at Pittsburgh Intl. Airport (PIT) at approximately 10:55AM UTC-5. The total travel time is 1h 35m.
How long does it take to fly from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT)?
The average flight time from STL to PIT is 1 hour and 35 minutes, covering a total distance of 550 mi.
What airline has the least delays from STL to PIT?
Consider booking with Southwest Airlines if you'd like to fly straight from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT) without any interruptions. This airline has the strongest track record for punctuality, with an on-time performance of 87%. Want to be notified if anything changes? You can check your flight status using the Expedia App.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT)?
To avoid potential delays on the Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT) route, travel before 3 PM. Departures after this hour are 22% more likely to be canceled.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
What airports do you fly into for Pittsburgh from Lambert-St. Louis Intl. Airport (STL)?
If you're traveling on a direct flight from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh, Pittsburgh Intl. Airport (PIT) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT) last-minute?
Booking your flight from STL to PIT just before your trip is generally more expensive. However, if you're flexible with your schedule, you could score a cheap last-minute fare.
Is it cheaper to book a STL to PIT flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to PIT flight and hotel package with Expedia could result in significant savings. Better still, having everything in one place takes the hassle out of travel planning. Simply secure your flights and select from our extensive range of stays, then tailor your trip with extras like tours and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Pittsburgh Intl. Airport (PIT)?
Typically, you can cancel or reschedule your STL to PIT flight. However, there may be additional fees, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you'd like more details, visit our Customer Service portal.

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