Cheap Flights from Pittsburgh (PIT) to St. Louis (CPS)

Popular airlines from Pittsburgh Intl. Airport (PIT) to St. Louis, MO (CPS-St. Louis Downtown)

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 $173
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $173

Frequently asked questions

How much does a flight from Pittsburgh Intl. Airport (PIT) to St. Louis Downtown Airport (CPS) cost?
Get a cheap one-way flight or cheap return flight from Pittsburgh Intl. Airport (PIT) to St. Louis Downtown Airport (CPS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight offers on this route.
What is the cheapest month to fly from Pittsburgh Intl. Airport (PIT) to St. Louis Downtown Airport (CPS)?
Planning your trip for may help you find better deals, as it's the cheapest month for flights between PIT and CPS. You'll often find the lowest prices during off-peak months.
What is the cheapest airline that flies from Pittsburgh Intl. Airport (PIT) to St. Louis Downtown Airport (CPS)?
Use the filters on Expedia to compare airlines and find the most affordable carrier that'll fly you from PIT to CPS. Then, sort your results by "Price (lowest to highest)" to snap up a great deal.
How many flights per day from Pittsburgh Intl. Airport (PIT) to St. Louis Downtown Airport (CPS)?
There aren't any daily nonstop flights available from Pittsburgh Intl. Airport (PIT) to St. Louis Downtown Airport (CPS). But you can opt for flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be soaring above the clouds before you know it.
What day of the week has the most flights from PIT to CPS?
Friday is typically the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can vary based on various factors, such as the season and airline.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Pittsburgh Intl. Airport (PIT) to St. Louis Downtown Airport (CPS)?
To avoid possible delays on the Pittsburgh Intl. Airport (PIT) to St. Louis Downtown Airport (CPS) route, aim to fly before 3 PM. Flights after this time 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 East St. Louis from Pittsburgh Intl. Airport (PIT)?
Explore your flight options from Pittsburgh Intl. Airport (PIT) to Lambert-St. Louis Intl. Airport (STL). This is the only airport in East St. Louis you can touch down at if you're taking a direct flight.
Is it cheaper to buy a plane ticket from Pittsburgh Intl. Airport (PIT) to St. Louis Downtown Airport (CPS) last-minute?
Booking your ticket from PIT to CPS right before your trip is usually more expensive. However, if there's some wiggle room with your departure dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a PIT to CPS flight and hotel package?
Booking a PIT to CPS flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your trip in one place. Select from our impressive range of hotels and then add activities, flights and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Pittsburgh Intl. Airport (PIT) to St. Louis Downtown Airport (CPS)?
You can usually cancel or reschedule your PIT to CPS flight. However, if it's been more than 24 hours since booking, additional fees may apply. Check your airline's policies in your itinerary to see what changes are possible and if any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Origin airport
Pittsburgh Intl.
Destination airport
St. Louis Downtown
Distance
543 mi

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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 . 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 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.