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Cheap flights from Pittsburgh to St. Louis from $77

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Pittsburgh to St. Louis departing on 3/11. 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 Pittsburgh to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
American Airlines Logo
6:30 am - 10:13 am
PIT
-
STL
4h 43m
1 stop
American Airlines Logo
3:49 pm - 11:10 pm
STL
-
PIT
6h 21m
1 stop
$186American Airlines
Sat, Feb 21 - Mon, Feb 23
Multiple Airlines Logo
5:45 pm - 8:56 am
PIT
-
STL
16h 11m
1 stop
Multiple Airlines Logo
3:49 pm - 4:39 pm
STL
-
PIT
23h 50m
1 stop
$197Multiple Airlines
Fri, Feb 20 - Mon, Feb 23
Multiple Airlines Logo
5:45 am - 10:27 pm
PIT
-
STL
17h 42m
1 stop
Multiple Airlines Logo
8:20 pm - 7:46 pm
STL
-
PIT
22h 26m
2 stops
$210Multiple Airlines
Wed, Feb 18 - Fri, Feb 20
Multiple Airlines Logo
4:29 pm - 6:51 am
PIT
-
STL
15h 22m
2 stops
Multiple Airlines Logo
3:49 pm - 4:39 pm
STL
-
PIT
23h 50m
1 stop
$211Multiple Airlines
Fri, Feb 20 - Mon, Feb 23
Southwest Logo
2:45 pm - 8:55 pm
PIT
-
STL
7h 10m
1 stop
Southwest Logo
1:45 pm - 9:20 pm
STL
-
PIT
6h 35m
1 stop
$213Southwest
Mon, Apr 13 - Thu, Apr 16
Delta Logo
7:35 pm - 11:58 pm
PIT
-
STL
5h 23m
1 stop
Delta Logo
5:57 pm - 10:46 pm
STL
-
PIT
3h 49m
1 stop
$215Delta
Thu, Apr 9 - Sat, Apr 11
Multiple Airlines Logo
5:45 pm - 11:59 pm
PIT
-
STL
7h 14m
1 stop
Multiple Airlines Logo
8:22 pm - 11:59 pm
STL
-
PIT
26h 37m
2 stops
$220Multiple Airlines
Sat, Feb 21 - Mon, Feb 23
Multiple Airlines Logo
5:45 pm - 11:59 pm
PIT
-
STL
7h 14m
1 stop
Multiple Airlines Logo
8:22 pm - 11:59 pm
STL
-
PIT
26h 37m
2 stops
$224Multiple Airlines
Sat, Feb 21 - Mon, Feb 23
Multiple Airlines Logo
5:32 am - 11:33 pm
PIT
-
STL
19h 01m
1 stop
Multiple Airlines Logo
8:17 pm - 11:59 pm
STL
-
PIT
26h 42m
2 stops
$234Multiple Airlines
Sat, Feb 7 - Wed, Feb 11
Frontier Logo
4:44 pm - 1:56 pm
PIT
-
STL
22h 12m
1 stop
Frontier Logo
3:49 pm - 1:24 pm
STL
-
PIT
20h 35m
1 stop
$240Frontier
Fri, Feb 20 - Sun, Feb 22

American Airlines flights from Pittsburgh to St. Louis

Our best American Airlines deals on Pittsburgh to St. Louis flight tickets
American Airlines
Feb 21
PIT6:30 amPittsburgh
4h 43m
1 stop
STL10:13 amLambert-St Louis
Feb 23
STL3:49 pmLambert-St Louis
6h 21m
1 stop
PIT11:10 pmPittsburgh
$186
American Airlines
Apr 16
PIT6:54 amPittsburgh
5h 15m
1 stop
STL11:09 amLambert-St Louis
Apr 19
STL6:00 amLambert-St Louis
4h 04m
1 stop
PIT11:04 amPittsburgh
$292
American Airlines
Apr 16
PIT7:07 pmPittsburgh
5h 41m
1 stop
STL11:48 pmLambert-St Louis
Apr 19
STL6:00 amLambert-St Louis
4h 04m
1 stop
PIT11:04 amPittsburgh
$303

Southwest flights from Pittsburgh to St. Louis

Our best Southwest deals on Pittsburgh to St. Louis flight tickets
Southwest
Apr 13
PIT2:45 pmPittsburgh
7h 10m
1 stop
STL8:55 pmLambert-St Louis
Apr 16
STL1:45 pmLambert-St Louis
6h 35m
1 stop
PIT9:20 pmPittsburgh
$213
Southwest
Feb 21
PIT11:20 amPittsburgh
1h 55m
STL12:15 pmLambert-St Louis
Feb 23
STL5:40 amLambert-St Louis
8h 50m
1 stop
PIT3:30 pmPittsburgh
$251
Southwest
Feb 21
PIT5:35 amPittsburgh
9h 15m
2 stops
STL1:50 pmLambert-St Louis
Feb 23
STL9:10 amLambert-St Louis
5h 35m
1 stop
PIT3:45 pmPittsburgh
$266

momondo Fare Finder

 
Customize your flight search to find flights from Pittsburgh to St. Louis 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 January 18, 2026.
Use the filters below to find and compare flights from Pittsburgh to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sat 2/21

6:30 am-10:13 am

1 stop4h 43m

Lambert-St Louis

Mon 2/23

3:49 pm-11:10 pm

1 stop6h 21m

$186

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 2/20

5:45 pm-8:56 am

1 stop16h 11m

Lambert-St Louis

Mon 2/23

3:49 pm-4:39 pm

1 stop23h 50m

$197

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 2/18

5:45 am-10:27 pm

1 stop17h 42m

Lambert-St Louis

Fri 2/20

8:20 pm-7:46 pm

2 stops22h 26m

$210

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 2/20

4:29 pm-6:51 am

2 stops15h 22m

Lambert-St Louis

Mon 2/23

3:49 pm-4:39 pm

1 stop23h 50m

$211

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Mon 4/13

2:45 pm-8:55 pm

1 stop7h 10m

Lambert-St Louis

Thu 4/16

1:45 pm-9:20 pm

1 stop6h 35m

$213

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 4/9

7:35 pm-11:58 pm

1 stop5h 23m

Lambert-St Louis

Sat 4/11

5:57 pm-10:46 pm

1 stop3h 49m

$215

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sat 2/21

5:45 pm-11:59 pm

1 stop7h 14m

Lambert-St Louis

Mon 2/23

8:22 pm-11:59 pm

2 stops26h 37m

$220

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sat 2/21

5:45 pm-11:59 pm

1 stop7h 14m

Lambert-St Louis

Mon 2/23

8:22 pm-11:59 pm

2 stops26h 37m

$224

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sat 2/7

5:32 am-11:33 pm

1 stop19h 01m

Lambert-St Louis

Wed 2/11

8:17 pm-11:59 pm

2 stops26h 42m

$234

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 2/20

4:44 pm-1:56 pm

1 stop22h 12m

Lambert-St Louis

Sun 2/22

3:49 pm-1:24 pm

1 stop20h 35m

$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 St. Louis from

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

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 cheapest month to fly to St. Louis?

In general, April is the cheapest month to fly from Pittsburgh to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $258. The month of November is another great option to travel to St. Louis, with average flight prices from Pittsburgh averaging around $283.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $316. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $426. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Pittsburgh at noon is the least expensive time of day to depart. momondo users have found prices as low as $323 when looking at flights departing at noon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $426 per ticket.

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

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

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Pittsburgh when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $340 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Pittsburgh for as low as $257 on momondo.

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

There is only 1 cabin class available to choose from on Pittsburgh to Lambert-St Louis 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 Pittsburgh to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Pittsburgh to St. Louis.

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

As of January 2026, prices for Pittsburgh to St. Louis flights are approximately 8% more expensive when compared to flights at the same time last year.

When to book flights from Pittsburgh to St. Louis

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

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

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

Best Price Found

$248

Fastest flight time

1h 45m

Direct flights

Mon, Tue, Thu, Fri, Sat and Sun

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Pittsburgh in the past 72 hours is $248. The best round-trip flight deal from Pittsburgh to St. Louis found on momondo in the last 72 hours is $371.
The fastest flight from Pittsburgh to St. Louis takes 1h 45m
Direct flights go from Pittsburgh to St. Louis on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. There are no airlines offering direct flights.
There is 1 airport in St. Louis. From Pittsburgh there are direct flights to Lambert-St Louis (STL).
Search flight deals

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

    The straight-line distance from Pittsburgh to Lambert-St Louis is 557.2 mi. Flights usually cover this in 1h 45m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Pittsburgh Airport to Lambert-St Louis Airport refresh daily.

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Pittsburgh Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The travel and health documents you'll need for your trip to Lambert-St Louis 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 Lambert-St Louis 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 Pittsburgh to St. Louis?

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

Best airlines flying from Pittsburgh to St. Louis

Compare and see reviews for airlines that fly from Pittsburgh to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
American AirlinesPriceFrom $170Free CancellationRating
7.2
11,155 reviews
Search American Airlines flights
SouthwestPriceFrom $241Free CancellationRating
8.0
4,261 reviews
Search Southwest flights
DeltaPriceFrom $258Free CancellationRating
7.9
8,075 reviews
Search Delta flights
United AirlinesPriceFrom $295Free CancellationRating
7.4
9,174 reviews
Search United Airlines flights

  • Southwest Flights From Pittsburgh to St. Louis

    The lowest priced Southwest flight from Pittsburgh to St. Louis from the last 72 hours was $241. Generally, Southwest has 9 flights on this route every week with an average price of $345. Southwest is rated 8.0/10 by our users.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Hermann
Fairview Heights
Maryland Heights
Florissant
O'Fallon
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Edwardsville
Festus
Glencoe
Litchfield
Shrewsbury

Why use momondo?

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

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

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

Flights from Pittsburgh to St. Louis 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 Pittsburgh to St. Louis?

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 St. Louis from Pittsburgh.

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

If you are not ready to book a flight from Pittsburgh to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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