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Cheap flights from St. Louis to Pittsburgh from $91

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Pittsburgh departing on 5/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to Pittsburgh

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
4:19 pm - 7:20 pm
STL
-
PIT
26h 01m
1 stop
Frontier Logo
8:15 pm - 11:57 pm
PIT
-
STL
28h 42m
1 stop
$181Frontier
Thu, May 28 - Mon, Jun 1
Southwest Logo
10:15 am - 12:55 pm
STL
-
PIT
1h 40mnonstop
Southwest Logo
7:10 pm - 8:00 pm
PIT
-
STL
1h 50mnonstop
$217Southwest
Wed, May 13 - Wed, May 20
American Airlines Logo
5:51 am - 4:48 pm
STL
-
PIT
9h 57m
1 stop
American Airlines Logo
9:19 am - 4:00 pm
PIT
-
STL
7h 41m
1 stop
$223American Airlines
Wed, May 13 - Wed, May 20
American Airlines Logo
12:27 pm - 9:00 pm
STL
-
PIT
7h 33m
1 stop
American Airlines Logo
9:19 am - 4:00 pm
PIT
-
STL
7h 41m
1 stop
$224American Airlines
Wed, May 13 - Wed, May 20
Southwest Logo
7:35 am - 12:50 pm
STL
-
PIT
4h 15m
1 stop
Southwest Logo
7:10 pm - 8:00 pm
PIT
-
STL
1h 50mnonstop
$226Southwest
Wed, May 13 - Wed, May 20
Frontier Logo
4:19 pm - 7:20 pm
STL
-
PIT
26h 01m
1 stop
Frontier Logo
8:05 pm - 12:21 am
PIT
-
STL
29h 16m
1 stop
$231Frontier
Fri, May 8 - Sun, May 10
Delta Logo
6:00 am - 12:44 pm
STL
-
PIT
5h 44m
1 stop
Delta Logo
7:50 pm - 11:59 pm
PIT
-
STL
5h 09m
1 stop
$235Delta
Sat, May 9 - Mon, May 11
Southwest Logo
8:30 am - 5:45 pm
STL
-
PIT
8h 15m
1 stop
Southwest Logo
6:45 am - 7:30 am
PIT
-
STL
1h 45mnonstop
$236Southwest
Tue, Jun 23 - Tue, Jun 30
Southwest Logo
7:10 pm - 9:45 pm
STL
-
PIT
1h 35mnonstop
Southwest Logo
7:45 pm - 8:30 pm
PIT
-
STL
1h 45mnonstop
$237Southwest
Tue, Jun 16 - Tue, Jun 23
Southwest Logo
10:25 am - 3:10 pm
STL
-
PIT
3h 45m
1 stop
Southwest Logo
12:45 pm - 6:25 pm
PIT
-
STL
6h 40m
2 stops
$240Southwest
Tue, Jun 2 - Tue, Jun 9

United Airlines flights from St. Louis to Pittsburgh

Our best United Airlines deals on St. Louis to Pittsburgh flight tickets
United Airlines
Jun 20
STL5:41 pmLambert-St Louis
5h 18m
1 stop
PIT11:59 pmPittsburgh
Jun 28
PIT6:16 pmPittsburgh
4h 10m
1 stop
STL9:26 pmLambert-St Louis
$323
United Airlines
May 27
STL6:00 amLambert-St Louis
6h 09m
1 stop
PIT1:09 pmPittsburgh
May 28
PIT6:10 amPittsburgh
5h 17m
1 stop
STL10:27 amLambert-St Louis
$331
United Airlines
Apr 27
STL7:45 amLambert-St Louis
4h 20m
1 stop
PIT1:05 pmPittsburgh
May 1
PIT2:08 pmPittsburgh
5h 04m
1 stop
STL6:12 pmLambert-St Louis
$430

Frontier flights from St. Louis to Pittsburgh

Our best Frontier deals on St. Louis to Pittsburgh flight tickets
Frontier
May 28
STL4:19 pmLambert-St Louis
26h 01m
1 stop
PIT7:20 pmPittsburgh
Jun 1
PIT8:15 pmPittsburgh
28h 42m
1 stop
STL11:57 pmLambert-St Louis
$181
Frontier
May 8
STL4:19 pmLambert-St Louis
26h 01m
1 stop
PIT7:20 pmPittsburgh
May 10
PIT8:05 pmPittsburgh
29h 16m
1 stop
STL12:21 amLambert-St Louis
$231
Frontier
May 28
STL4:19 pmLambert-St Louis
26h 01m
1 stop
PIT7:20 pmPittsburgh
Jun 1
PIT8:15 pmPittsburgh
22h 18m
2 stops
STL5:33 pmLambert-St Louis
$256

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Pittsburgh that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated April 18, 2026.
Use the filters below to find and compare flights from St. Louis to Pittsburgh that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Thu 5/28

4:19 pm-7:20 pm

1 stop26h 01m

Pittsburgh

Mon 6/1

8:15 pm-11:57 pm

1 stop28h 42m

$181

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Wed 5/13

10:15 am-12:55 pm

Nonstop1h 40m

Pittsburgh

Wed 5/20

7:10 pm-8:00 pm

Nonstop1h 50m

$217

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Wed 5/13

5:51 am-4:48 pm

1 stop9h 57m

Pittsburgh

Wed 5/20

9:19 am-4:00 pm

1 stop7h 41m

$223

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Wed 5/13

12:27 pm-9:00 pm

1 stop7h 33m

Pittsburgh

Wed 5/20

9:19 am-4:00 pm

1 stop7h 41m

$224

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Wed 5/13

7:35 am-12:50 pm

1 stop4h 15m

Pittsburgh

Wed 5/20

7:10 pm-8:00 pm

Nonstop1h 50m

$226

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Fri 5/8

4:19 pm-7:20 pm

1 stop26h 01m

Pittsburgh

Sun 5/10

8:05 pm-12:21 am

1 stop29h 16m

$231

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Sat 5/9

6:00 am-12:44 pm

1 stop5h 44m

Pittsburgh

Mon 5/11

7:50 pm-11:59 pm

1 stop5h 09m

$235

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Tue 6/23

8:30 am-5:45 pm

1 stop8h 15m

Pittsburgh

Tue 6/30

6:45 am-7:30 am

Nonstop1h 45m

$236
Quickest round-trip

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Tue 6/16

7:10 pm-9:45 pm

Nonstop1h 35m

Pittsburgh

Tue 6/23

7:45 pm-8:30 pm

Nonstop1h 45m

$237

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Tue 6/2

10:25 am-3:10 pm

1 stop3h 45m

Pittsburgh

Tue 6/9

12:45 pm-6:25 pm

2 stops6h 40m

$240

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Pittsburgh from

How to get the cheapest flight ticket from St. Louis to Pittsburgh

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Pittsburgh?

What is the cheapest month to fly to Pittsburgh?

In general, December is the cheapest month to fly from St. Louis to Pittsburgh. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $263. The month of August is another great option to travel to Pittsburgh, with average flight prices from St. Louis averaging around $320.

What is the cheapest day to depart on your flight to Pittsburgh?

The cheapest day to depart on your flight to Pittsburgh is on a Saturday when prices can be found for as low as $281. This is often the case because there is less demand to fly during this day of the week. Flights from St. Louis to Pittsburgh on a Sunday will generally be more expensive and average around $545. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Pittsburgh?

Our data shows that the cheapest St. Louis to Pittsburgh flights are usually those with departure times in the afternoon. Our users have found flights to Pittsburgh in the afternoon for as low as $289. Flights to Pittsburgh are more costly in the evening, with an average ticket price of $545. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Lambert-St Louis to Pittsburgh flight route?

Fly from Lambert-St Louis to Pittsburgh for the best Lambert-St Louis - Pittsburgh flight prices

What cabin class options are available on Lambert-St Louis to Pittsburgh flights?

There is only 1 cabin class available to choose from on Lambert-St Louis to Pittsburgh flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on St. Louis to Pittsburgh flights?

You could potentially save up to 29% on your flight if you consider stops on a St. Louis to Pittsburgh flight.

How have St. Louis to Pittsburgh flight prices changed over time?

As of April 2026, prices for St. Louis to Pittsburgh flights are approximately 12% more expensive when compared to flights at the same time last year.

When to book flights from St. Louis to Pittsburgh

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Pittsburgh according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Pittsburgh (STL to PIT) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Pittsburgh

Best Price Found

$184

Fastest flight time

1h 35m

Direct flights

Tue, Wed, Thu, Fri, Sat and Sun

Airports in Pittsburgh

1 airport
The best one-way flight to Pittsburgh from St. Louis in the past 72 hours is $184. The best round-trip flight deal from St. Louis to Pittsburgh found on momondo in the last 72 hours is $350.
The fastest flight from St. Louis to Pittsburgh takes 1h 35m
Direct flights go from St. Louis to Pittsburgh on Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday. The only airline offering direct flights is Southwest.
There is 1 airport in Pittsburgh. From St. Louis there are direct flights to Pittsburgh (PIT).
Search flight deals

Frequently asked questions about flying from St. Louis to Pittsburgh

  • How far is Lambert-St Louis to Pittsburgh by plane?

    The distance between Lambert-St Louis and Pittsburgh is about 557.2 mi. Typically, this will take 1h 35m by plane in normal conditions.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Pittsburgh Airport?

    Prices for flights from Lambert-St Louis Airport to Pittsburgh Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Pittsburgh Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Pittsburgh Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Pittsburgh Airport.

  • What documentation or ID do you need to fly to Pittsburgh Airport?

    The travel and health documents you'll need for your trip to Pittsburgh Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Pittsburgh Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from St. Louis to Pittsburgh?

  • What is the most popular airline from St. Louis to Pittsburgh?

Best airlines flying from St. Louis to Pittsburgh

Compare and see reviews for airlines that fly from St. Louis to Pittsburgh with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $208Free CancellationRating
7.1
11,604 reviews
Search American Airlines flights
SouthwestPriceFrom $235Free CancellationRating
8.0
4,330 reviews
Search Southwest flights
DeltaPriceFrom $252Free CancellationRating
7.9
8,424 reviews
Search Delta flights

  • Southwest Flights From St. Louis to Pittsburgh

    Southwest flight deals from St. Louis to Pittsburgh start from $235 round-trip. Over the 7 Southwest flights for this route in a normal week, average airfare is usually $370 round-trip - but some users have found much cheaper deals with momondo.

Traveling to a place near Pittsburgh?

Book flights to Pittsburgh if you plan to visit one of these locations
Washington
Monroeville
Wheeling
Butler
Canonsburg
Triadelphia
New Castle
West Mifflin
Belle Vernon
Steubenville
Coraopolis
Mars
Moon
Wexford
Cadiz
Chester
Bridgeport
Edgewood

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Pittsburgh?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Pittsburgh. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Pittsburgh with flexible booking policies on momondo?

Flights from St. Louis to Pittsburgh with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Pittsburgh?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Pittsburgh from St. Louis.

I’m not ready to book a flight from St. Louis to Pittsburgh right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Pittsburgh, momondo offers a useful price alert feature which will track prices for flights to Pittsburgh from St. Louis and alert you when they change.

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