Cheap Flights from Pittsburgh International to St Louis

Compare Pittsburgh International to St Louis flight deals

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Flight deals from Pittsburgh International to St Louis

Looking for a cheap last-minute deal or the best return flight from Pittsburgh International to St Louis? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Pittsburgh International to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Pittsburgh International to St Louis flights are currently cheapest in June.

Direct flights from Pittsburgh International to St Louis

Pittsburgh International to St Louis: Alternative routes

Compare routes from Pittsburgh International to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

Pittsburgh to St Louis: Flight information

The things to know before you go.
Cheapest flight foundR 2,394
Cheapest month to flyJune
Average flight time1 hr, 49 mins
Most popular airlineSouthwest Airlines
Average flights per week9

Finding cheap flights from Pittsburgh International to St Louis: Frequently asked questions

The best price we found for a return flight from Pittsburgh International to St Louis is R 4,811. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
1 hour and 49 minutes is the average flight time from Pittsburgh International to St Louis.
Southwest Airlines flies direct from Pittsburgh International to St Louis.
As of June 2025, there are 9 flights per week flying from Pittsburgh International to St Louis.
The cheapest month to fly from Pittsburgh International to St Louis is usually June 2025.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Pittsburgh International Airport to St Louis Airport on Friday, 19 September 2025.
Yes – the average flight time is 1 hour and 49 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, Southwest Airlines offers the cheapest flight tickets to St Louis.

Travelling from Pittsburgh International Airport (PIT) to Lambert-St. Louis International Airport (STL): what you need to know

  • Around 1 hour 45 minutes is how long you can expect to be in the air on a direct flight from Pittsburgh International Airport to Lambert-St. Louis International Airport.

  • St Louis is one hour behind Pittsburgh and observes the UTC-5 timezone.

  • Choose from six weekly Pittsburgh International Airport to Lambert-St. Louis International Airport flights. The 07:30 departure with Southwest Airlines is the earliest available. Southwest Airlines operates the last service of the day at 21:10.

  • To ensure you catch your PIT to STL flight, leave plenty of time to navigate the airport and find your gate. Arriving two hours ahead of international departures and an hour before domestic flights is the general rule.

  • Flying during a peak time like July? School holidays and other popular seasons can result in longer queues and delays at security. Play things extra safe and arrive up to four hours before an international flight and two hours before domestic departures.

  • Southwest Airlines offers direct flights from Pittsburgh International Airport to Lambert-St. Louis International Airport. Book with this popular carrier, then get ready to discover the sights in St Louis — and maybe even more of United States if time allows.

  • The airline that tops the list for bookings on this route is Southwest Airlines.

  • With a reliable 86.89% of services arriving on schedule, Southwest Airlines is the most punctual carrier operating PIT to STL flights.

  • Consider adding a stopover when booking your ticket from Pittsburgh International Airport to Lambert-St. Louis International Airport. Just uncheck 'Direct flights only' to break up your trip, or visit a new city along the way. Here's where you can stop between PIT and STL:

    • Chicago Midway International Airport

    • Detroit Metropolitan Wayne County Airport

    • Nashville International Airport

How to find the cheapest flights from Pittsburgh International Airport (PIT) to Lambert-St. Louis International Airport (STL)

  • The cheapest price we've seen for a one-way Pittsburgh International Airport to Lambert-St. Louis International Airport flight is R 2,394. A return ticket is currently R 4,811. Depending on the availability and when you book, these fares may change.

  • Get cheap tickets from PIT to STL by booking at least six months ahead. According to our research, that's the sweet spot for bagging a bargain.

  • The cheapest month for flights from Pittsburgh International Airport to Lambert-St. Louis International Airport is May. Use the 'Whole month' tool to see the lowest airfares if you have flexible dates.

  • Landing cheap flights from PIT to STL is a breeze with Price Alerts. Simply create one of these automatic alerts and we'll notify you as soon as a new discounted fare appears.

  • Tailor your flights with filters. Select your ideal arrival and departure times, airlines and total journey duration. You can also sort your results by 'Fastest,' 'Best' or 'Cheapest' flights from Pittsburgh International Airport to Lambert-St. Louis International Airport.

Handy information about Pittsburgh International Airport (PIT)

  • PIT's address is 1000 Airport Boulevard.

  • Of all flights leaving Pittsburgh International Airport, 76.88% arrive as scheduled at their destination.

  • Pittsburgh International Airport is about 27 kilometres from central Pittsburgh. If you're driving, catching a cab or ride-sharing from the centre, it'll take 25 minutes or so to arrive, depending on the traffic.

  • Searching for a convenient hotel near PIT? If you're catching an early flight from Pittsburgh International Airport to Lambert-St. Louis International Airport, these stays will have you sleeping moments from your departure gate:

Arriving at Lambert-St. Louis International Airport (STL)

Getting from Lambert-St. Louis International Airport (STL) to central St Louis

  • The address for STL is 10701 Lambert International Blvd..

  • Lambert-St. Louis International Airport is approximately 26 kilometres from the centre of St Louis. The drive time takes about 20 minutes.

  • If you're travelling on public transport, expect a journey of about 35 minutes.

When to fly to Lambert-St. Louis International Airport (STL)

  • The quietest month for a flight from Pittsburgh International Airport to Lambert-St. Louis International Airport is April, while July is the busiest. Pick the ideal time to visit St Louis based on whether you prefer a more relaxed vibe or a faster pace.

  • The warmest month in St Louis is July, with temperatures ranging between 17ºC (63ºF) and 33ºC (91ºF). Lock in your flights from Pittsburgh International Airport to Lambert-St. Louis International Airport in this month if this is the kind of weather you like.

  • If you like cooler conditions, search for a cheap ticket from PIT to STL in January. Average temperatures are between -8ºC (18ºF) and 7ºC (45ºF) then.

Explore more of United States

  • You've seen St Louis, now it's time to discover more of United States. Travel around 418 kilometres north-east to Chicago to tick off its leading attractions. From Millennium Park to Art Institute of Chicago and LandShark Beer Garden at Navy Pier, you'll have a packed itinerary ahead.

  • Around 370 kilometres east of St Louis, Indianapolis is another favourite stop in United States. Experience major highlights starting with The Children's Museum of Indianapolis, Indianapolis Museum of Art and Indianapolis Zoo.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.