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CA $174 Cheap Flights from Pittsburgh (PIT) to St. Louis (STL)

View CA $174 flight on Sat, Oct 17, 2026Opens in a new window

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

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Cheap flights from Pittsburgh (PIT) to St. Louis (STL)

Prices were available within the past 7 days and start at CA $174 for one-way flights and CA $420 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Apr 17 - Tue, Apr 20
PIT
Pittsburgh
STL
St. Louis
CA $420 Roundtrip, found 14 hours ago
CA $420
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Sat, Apr 17 from Pittsburgh to St. Louis, returning Tue, Apr 20, priced at CA $420 found 14 hours ago
American Airlines
Sat, Apr 17 - Tue, Apr 20
PIT
Pittsburgh
STL
St. Louis
CA $434 Roundtrip, found 14 hours ago
CA $434
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Sat, Apr 17 from Pittsburgh to St. Louis, returning Tue, Apr 20, priced at CA $434 found 14 hours ago
Southwest Airlines
Sat, Apr 17 - Tue, Apr 20
PIT
Pittsburgh
STL
St. Louis
CA $447 Roundtrip, found 14 hours ago
CA $447
Roundtrip
found 14 hours ago
Select Southwest Airlines flight, departing Sat, Apr 17 from Pittsburgh to St. Louis, returning Tue, Apr 20, priced at CA $447 found 14 hours ago
Delta
Sat, Apr 17 - Tue, Apr 20
PIT
Pittsburgh
STL
St. Louis
CA $448 Roundtrip, found 14 hours ago
CA $448
Roundtrip
found 14 hours ago
Select Delta flight, departing Sat, Apr 17 from Pittsburgh to St. Louis, returning Tue, Apr 20, priced at CA $448 found 14 hours ago
Delta
Sat, Apr 17 - Tue, Apr 20
PIT
Pittsburgh
STL
St. Louis
CA $462 Roundtrip, found 14 hours ago
CA $462
Roundtrip
found 14 hours ago
Select Delta flight, departing Sat, Apr 17 from Pittsburgh to St. Louis, returning Tue, Apr 20, priced at CA $462 found 14 hours ago
American Airlines
Sat, Apr 17 - Tue, Apr 20
PIT
Pittsburgh
STL
St. Louis
CA $466 Roundtrip, found 14 hours ago
CA $466
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Sat, Apr 17 from Pittsburgh to St. Louis, returning Tue, Apr 20, priced at CA $466 found 14 hours ago
American Airlines
Sat, Apr 17 - Tue, Apr 20
PIT
Pittsburgh
STL
St. Louis
CA $476 Roundtrip, found 14 hours ago
CA $476
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Sat, Apr 17 from Pittsburgh to St. Louis, returning Tue, Apr 20, priced at CA $476 found 14 hours ago
American Airlines
Sat, Apr 17 - Tue, Apr 20
PIT
Pittsburgh
STL
St. Louis
CA $480 Roundtrip, found 14 hours ago
CA $480
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Sat, Apr 17 from Pittsburgh to St. Louis, returning Tue, Apr 20, priced at CA $480 found 14 hours ago
American Airlines
Sat, Apr 17 - Tue, Apr 20
PIT
Pittsburgh
STL
St. Louis
CA $486 Roundtrip, found 14 hours ago
CA $486
Roundtrip
found 14 hours ago
Select American Airlines flight, departing Sat, Apr 17 from Pittsburgh to St. Louis, returning Tue, Apr 20, priced at CA $486 found 14 hours ago
United
Sat, Apr 17 - Tue, Apr 20
PIT
Pittsburgh
STL
St. Louis
CA $513 Roundtrip, found 14 hours ago
CA $513
Roundtrip
found 14 hours ago
Select United flight, departing Sat, Apr 17 from Pittsburgh to St. Louis, returning Tue, Apr 20, priced at CA $513 found 14 hours ago

Frequently asked questions

How much does a flight from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find one-way and return flights from PIT to STL with Expedia. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see our cheapest fares first, and use the Price Tracking tool to receive alerts when PIT to STL ticket fares go up or down.
What is the cheapest month to fly from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The cheapest months to fly from PIT to STL are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Only one airline offers direct flights from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.). Southwest Airlines operates 13 direct flights from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) every week.
How do I find cheap flights from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best airline to fly with from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will differ from traveler to traveler. If you like to fly early, Southwest Airlines offers early morning flights. If price is the most important factor, Southwest Airlines typically offers the lowest fares. Southwest Airlines offers the most daily flights from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.), which is great if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You'll find approximately 2 nonstop flights per day from Pittsburgh Intl. (PIT) to Lambert-St. Louis Intl. (STL). For even more choices, look at flights that include layovers, as there are around 82 connecting flights per day. Some common connection points include O'Hare Intl. (ORD), Hartsfield-Jackson Atlanta Intl. (ATL), and Orlando Intl. (MCO).
What is the earliest flight from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) typically departs around 5:00 AM. This service is offered by American Airlines. This is a seasonal service, active in January and December. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You'll find the most flights from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) on Fridays, with around 59 flights available. This gives you a good selection of options for your travel plans. Major airlines on this route include Southwest Airlines, American Airlines, and United. Fridays offer notably more flight options compared to other days of the week, making it a convenient day to travel.
What are the most popular departure times for flights from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Pittsburgh Intl. (PIT) to Lambert-St. Louis Intl. (STL) are in the early morning, from 6am to 9am. Many major carriers, including American Airlines, Southwest Airlines and United, offer flights during this window. Many travellers prefer these times as it allows them to arrive at their destination early in the day, giving them more time for business or leisure activities.
How long does it take to fly from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
A nonstop flight from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) typically takes around 1 hour 48 minutes, covering a distance of approximately 887 kilometers. If you opt for a one-stop flight, your travel time will be longer, usually around 6 hours 18 minutes. Flights with two or more stops can take significantly longer, often around 9 hours. Keep in mind that actual flight times can vary due to factors like routing, weather, and wind patterns.
Can you fly business or first class from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You can fly business class or first class between PIT and STL. You can fly business class with Frontier Airlines and Delta.First class cabins are available on Alaska Airlines, United, Delta, and American Airlines.
How do I earn miles on a Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis, MO (STL) from Pittsburgh, PA (PIT)?
If you're planning to travel to St. Louis from Pittsburgh Intl. (PIT), you can fly directly into Lambert-St. Louis Intl. (STL). Some flights may connect through major hubs like Baltimore Washington Intl. Thurgood Marshall (BWI), Midway Intl. (MDW), or Nashville Intl. (BNA) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities 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, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Pittsburgh, PA (PIT-Pittsburgh Intl.) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

0
Origin airport
Pittsburgh Intl.
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
CA $419
Distance
881 km

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Pittsburgh to St. Louis Flights

The easy way to book your flights from Pittsburgh to St. Louis 

With Expedia, it’s simple to find and book flights to St. Louis from Pittsburgh whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Lambert-St. Louis Intl., too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Pittsburgh to St. Louis today, tomorrow, or this week.  

 

Save dollars with cheap flights from Pittsburgh Intl., PIT to Lambert-St. Louis Intl., STL 

Sort your search results by price to find great deals on your flight from Pittsburgh to St. Louis—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to St. Louis from Pittsburgh currently is just CA $420 rising to CA $513.  

Here are more money-saving tips: 

  • Fly in April when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to St. Louis  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to St. Louis from Pittsburgh 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to St. Louis with Expedia today.

Pittsburgh to St. Louis Flights

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