$54 Cheap Flights from Pittsburgh (PIT) to St. Louis (STL)

View $54 flight on Mon, Feb 9, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $54 for one-way flights and $117 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Southwest Airlines
Thu, Jan 29 - Mon, Feb 2
PIT
Pittsburgh
STL
St. Louis
$117 Roundtrip, found 6 hours ago
$117
Roundtrip
found 6 hours ago
Select Southwest Airlines flight, departing Thu, Jan 29 from Pittsburgh to St. Louis, returning Mon, Feb 2, priced at $117 found 6 hours ago
Southwest Airlines
Mon, Feb 9 - Thu, Feb 12
PIT
Pittsburgh
STL
St. Louis
$133 Roundtrip, found 11 hours ago
$133
Roundtrip
found 11 hours ago
Select Southwest Airlines flight, departing Mon, Feb 9 from Pittsburgh to St. Louis, returning Thu, Feb 12, priced at $133 found 11 hours ago
American Airlines
Thu, Jan 29 - Mon, Feb 2
PIT
Pittsburgh
STL
St. Louis
$138 Roundtrip, found 6 hours ago
$138
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Thu, Jan 29 from Pittsburgh to St. Louis, returning Mon, Feb 2, priced at $138 found 6 hours ago
Southwest Airlines
Mon, Feb 9 - Thu, Feb 12
PIT
Pittsburgh
STL
St. Louis
$143 Roundtrip, found 11 hours ago
$143
Roundtrip
found 11 hours ago
Select Southwest Airlines flight, departing Mon, Feb 9 from Pittsburgh to St. Louis, returning Thu, Feb 12, priced at $143 found 11 hours ago
United
Thu, Jan 29 - Mon, Feb 2
PIT
Pittsburgh
STL
St. Louis
$152 Roundtrip, found 6 hours ago
$152
Roundtrip
found 6 hours ago
Select United flight, departing Thu, Jan 29 from Pittsburgh to St. Louis, returning Mon, Feb 2, priced at $152 found 6 hours ago
Frontier Airlines
Sun, Nov 9 - Thu, Nov 13
PIT
Pittsburgh
STL
St. Louis
$153 Roundtrip, found 7 hours ago
$153
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Sun, Nov 9 from Pittsburgh to St. Louis, returning Thu, Nov 13, priced at $153 found 7 hours ago
Southwest Airlines
Thu, Jan 22 - Mon, Jan 26
PIT
Pittsburgh
STL
St. Louis
$157 Roundtrip, found 1 day ago
$157
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Thu, Jan 22 from Pittsburgh to St. Louis, returning Mon, Jan 26, priced at $157 found 1 day ago
Southwest Airlines
Thu, Jan 22 - Mon, Jan 26
PIT
Pittsburgh
STL
St. Louis
$158 Roundtrip, found 1 day ago
$158
Roundtrip
found 1 day ago
Select Southwest Airlines flight, departing Thu, Jan 22 from Pittsburgh to St. Louis, returning Mon, Jan 26, priced at $158 found 1 day ago
American Airlines
Thu, Jan 29 - Mon, Feb 2
PIT
Pittsburgh
STL
St. Louis
$159 Roundtrip, found 6 hours ago
$159
Roundtrip
found 6 hours ago
Select American Airlines flight, departing Thu, Jan 29 from Pittsburgh to St. Louis, returning Mon, Feb 2, priced at $159 found 6 hours ago
Delta
Sun, Jan 11 - Mon, Jan 12
PIT
Pittsburgh
STL
St. Louis
$178 Roundtrip, found 6 days ago
$178
Roundtrip
found 6 days ago
Select Delta flight, departing Sun, Jan 11 from Pittsburgh to St. Louis, returning Mon, Jan 12, priced at $178 found 6 days ago

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

October is typically the cheapest month to fly

From $146 - $768 per traveler.

Alternative airports near St. Louis

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $457
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $457

Frequently asked questions

How much does a flight from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $54 or cheap return flight from $117 from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL)?
January is the least expensive month to fly from PIT to STL. Timing your trip outside of the busy season is often the key to finding better fares.
Which airlines fly direct from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL)?
When departing from Pittsburgh Intl. Airport (PIT), you can catch a nonstop flight to Lambert-St. Louis Intl. Airport (STL) with Southwest Airlines.
What is the cheapest airline that flies from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL)?
To find the cheapest airline that'll fly you from PIT to STL, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and number of stops. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL)?
On average, you can pick from 6 direct weekly flights from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL). To expand your choices, consider flights with layovers. Simply enter your details on Expedia and then filter your search results to show one stop or more.
What are the most popular departure times for flights from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL)?
Flights between PIT and STL are busiest at 9 AM. If you want a quieter experience and possibly cheaper tickets, choose a time when demand is lower.
What day of the week has the most flights from PIT to STL?
Friday offers the most flights from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL). Consider taking off on this day and you'll have the best chance of finding a schedule that works for you.
What is the earliest flight from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL)?
Pittsburgh Intl. Airport (PIT)'s earliest flight to Lambert-St. Louis Intl. Airport (STL) departs at approximately 9:15AM UTC-5. With a travel duration of 2h, you'll land at around 10:15AM UTC-6.
How long does it take to fly from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL)?
Flights from PIT to STL have an average travel time of 1 hour and 58 minutes. The total distance between the two airports is 550 mi.
What is the best time to fly from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL)?
Opt for a flight from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL) that takes off before 3 PM to reduce the likelihood of delays and cancellations. Departures after this hour have a 22% higher chance of being canceled, on average.**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 St. Louis from Pittsburgh Intl. Airport (PIT)?
Browse your flight options from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL). This is the only airport in St. Louis you can fly into if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Booking your flight from PIT to STL right before your journey is generally more expensive. However, if there's some wiggle room with your departure times and dates, you could land a cheap last-minute fare.
Is it cheaper to book a PIT to STL flight and hotel package?
You'll typically save money by booking a PIT to STL flight and hotel package compared to booking separately. In fact, travelers could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one place. Once you've selected your ideal flights and accommodations, you can add extras such as car rentals, tours and activities.
Can I cancel or change the date of my flight from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL)?
If you booked your PIT to STL flight within the last 24 hours, you may be able to cancel or modify it at no cost. Depending on the airline and the type of fare you purchased, additional charges may apply for changes beyond that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal for further details.

Travel information

0
Origin airport
Pittsburgh Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, Southwest Airlines, United
Roundtrip price
$116
Distance
551 mi

Book with confidence

Pittsburgh to St. Louis Flights

The cheapest times to fly from Pittsburgh to St. Louis

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 Pittsburgh to St. Louis are during the month of January. You can find some of the cheapest flights from Pittsburgh to St. Louis with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from Pittsburgh to St. Louis: 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 Pittsburgh to St. Louis

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 Pittsburgh to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $54 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 Pittsburgh to St. Louis 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 Pittsburgh to St. Louis 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.

 

Pittsburgh to St. Louis Flights

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*Available to One Key members.