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

Popular airlines from Pittsburgh Intl. Airport (PIT) to St. Louis, MO (SUS-Spirit of St. Louis)

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
Flights from Pittsburgh (PIT) to St. Louis (SUS)
Origin airport
Pittsburgh Intl.
Destination airport
Spirit of St. Louis
Distance
567 mi

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.

 

Frequently asked questions

How much does a flight from Pittsburgh Intl. Airport (PIT) to Spirit of St. Louis Airport (SUS) cost?
Secure a cheap one-way flight or cheap return flight from Pittsburgh Intl. Airport (PIT) to Spirit of St. Louis Airport (SUS) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Pittsburgh Intl. Airport (PIT) to Spirit of St. Louis Airport (SUS)?
Flying in may help you find better deals, as it's the cheapest month for flights between PIT and SUS. You'll often find the lowest prices during the off-season.
What is the cheapest airline that flies from Pittsburgh Intl. Airport (PIT) to Spirit of St. Louis Airport (SUS)?
To find the cheapest airline flying from PIT to SUS, use Expedia's filter tool. Tailor your search based on your travel needs, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to see the most affordable options first.
How many flights per day from Pittsburgh Intl. Airport (PIT) to Spirit of St. Louis Airport (SUS)?
You'll have to book a flight with a layover when traveling from Pittsburgh Intl. Airport (PIT) to Spirit of St. Louis Airport (SUS). Direct flights don't operate daily on this route. However, simply filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from PIT to SUS?
Generally you'll find the most flight options available on a Friday. Tuesdays are often the quietest.* But this can vary based on the time of year, airline and other factors.*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 Spirit of St. Louis Airport (SUS)?
To arrive at Spirit of St. Louis Airport (SUS) on schedule, pick a flight that leaves Pittsburgh Intl. Airport (PIT) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this time.**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)?
If you're traveling on a direct flight from Pittsburgh Intl. Airport (PIT) to St. Louis, Lambert-St. Louis Intl. Airport (STL) is the only airport you can land at.
Is it cheaper to buy a plane ticket from Pittsburgh Intl. Airport (PIT) to Spirit of St. Louis Airport (SUS) last-minute?
Holding off until just before your departure to book your flight from PIT to SUS generally means paying more. While you may find some last-minute offers, there's no guarantee. Keep your travel plans flexible to maximize your chances of scoring a bargain.
Is it cheaper to book a PIT to SUS flight and hotel package?
Compared with arranging hotels and flights separately, booking a PIT to SUS flight and hotel package with Expedia could result in significant savings. What's more, having everything in one convenient place takes the hassle out of travel planning. Simply secure your flights and choose from our extensive range of hotels, then personalize your trip with other add-ons like tours and car rentals.
Can I cancel or change the date of my flight from Pittsburgh Intl. Airport (PIT) to Spirit of St. Louis Airport (SUS)?
Typically, it's possible to cancel or reschedule your PIT to SUS flight. However, if the booking was made more than 24 hours ago, 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.

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*Available to One Key members.