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Cheap flights from Pittsburgh to St. Louis from $68

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 10/15. 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

American Airlines Logo
5:06 pm - 10:55 pmPIT-STL
6h 49m1 stop
American Airlines Logo
3:38 pm - 9:15 pmSTL-PIT
4h 37m1 stop
$159American Airlines
Find Deal
Tue, Oct 28 - Tue, Nov 4
United Airlines Logo
2:11 pm - 5:39 pmPIT-STL
4h 28m1 stop
United Airlines Logo
5:27 pm - 11:38 pmSTL-PIT
5h 11m1 stop
$164United Airlines
Find Deal
Sun, Nov 23 - Tue, Dec 2
American Airlines Logo
12:26 pm - 4:10 pmPIT-STL
4h 44m1 stop
American Airlines Logo
7:16 am - 4:34 pmSTL-PIT
8h 18m1 stop
$171American Airlines
Find Deal
Tue, Oct 7 - Mon, Oct 13
American Airlines Logo
5:06 pm - 11:54 pmPIT-STL
7h 48m1 stop
American Airlines Logo
6:00 am - 2:42 pmSTL-PIT
7h 42m1 stop
$183American Airlines
Find Deal
Tue, Oct 7 - Wed, Oct 8
Delta Logo
1:50 pm - 6:04 pmPIT-STL
5h 14m1 stop
Delta Logo
10:45 am - 5:39 pmSTL-PIT
5h 54m1 stop
$197Delta
Find Deal
Tue, Mar 10 - Wed, Mar 11
Southwest Logo
7:00 am - 7:50 amPIT-STL
1h 50mnonstop
Southwest Logo
8:15 am - 10:50 amSTL-PIT
1h 35mnonstop
$263Southwest
Find Deal
Thu, Oct 9 - Mon, Oct 13
Multiple Airlines Logo
6:51 pm - 10:02 amPIT-STL
16h 11m1 stop
Multiple Airlines Logo
8:40 pm - 10:21 amSTL-PIT
12h 41m2 stops
$265Multiple Airlines
Find Deal
Sat, Oct 25 - Tue, Oct 28
Southwest Logo
7:00 am - 7:50 amPIT-STL
1h 50mnonstop
Southwest Logo
6:45 pm - 11:05 pmSTL-PIT
3h 20m1 stop
$268Southwest
Find Deal
Thu, Oct 9 - Mon, Oct 13
Multiple Airlines Logo
7:12 am - 3:38 pmPIT-STL
9h 26m1 stop
Multiple Airlines Logo
10:57 am - 5:46 pmSTL-PIT
29h 49m1 stop
$278Multiple Airlines
Find Deal
Sat, Oct 11 - Sun, Oct 12
Delta Logo
1:00 pm - 5:09 pmPIT-STL
5h 09m1 stop
Delta Logo
6:09 pm - 11:05 pmSTL-PIT
3h 56m1 stop
$361Delta
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Wed, Nov 26 - Mon, Dec 1

Southwest flights from Pittsburgh to St. Louis

Our best Southwest deals on Pittsburgh to St. Louis flight tickets
Southwest
Oct 9
PIT7:00 amPittsburgh
1h 50m
STL7:50 amLambert-St Louis
Oct 13
STL8:15 amLambert-St Louis
1h 35m
PIT10:50 amPittsburgh
$263
Find similar
Southwest
Oct 9
PIT7:00 amPittsburgh
1h 50m
STL7:50 amLambert-St Louis
Oct 13
STL6:45 pmLambert-St Louis
3h 20m
1 stop
PIT11:05 pmPittsburgh
$268
Find similar
Southwest
Oct 24
PIT7:00 amPittsburgh
1h 50m
STL7:50 amLambert-St Louis
Oct 27
STL8:15 amLambert-St Louis
1h 35m
PIT10:50 amPittsburgh
$281
Find similar

American Airlines flights from Pittsburgh to St. Louis

Our best American Airlines deals on Pittsburgh to St. Louis flight tickets
American Airlines
Oct 28
PIT5:06 pmPittsburgh
6h 49m
1 stop
STL10:55 pmLambert-St Louis
Nov 4
STL3:38 pmLambert-St Louis
4h 37m
1 stop
PIT9:15 pmPittsburgh
$159
Find similar
American Airlines
Oct 7
PIT12:26 pmPittsburgh
4h 44m
1 stop
STL4:10 pmLambert-St Louis
Oct 13
STL7:16 amLambert-St Louis
8h 18m
1 stop
PIT4:34 pmPittsburgh
$171
Find similar
American Airlines
Oct 7
PIT5:06 pmPittsburgh
7h 48m
1 stop
STL11:54 pmLambert-St Louis
Oct 8
STL6:00 amLambert-St Louis
7h 42m
1 stop
PIT2:42 pmPittsburgh
$183
Find similar

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 September 17, 2025.
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

Tue 10/28

5:06 pm-10:55 pm

1 stop6h 49m

Lambert-St Louis

Tue 11/4

3:38 pm-9:15 pm

1 stop4h 37m

$159

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sun 11/23

2:11 pm-5:39 pm

1 stop4h 28m

Lambert-St Louis

Tue 12/2

5:27 pm-11:38 pm

1 stop5h 11m

$164

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 10/7

12:26 pm-4:10 pm

1 stop4h 44m

Lambert-St Louis

Mon 10/13

7:16 am-4:34 pm

1 stop8h 18m

$171

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 10/7

5:06 pm-11:54 pm

1 stop7h 48m

Lambert-St Louis

Wed 10/8

6:00 am-2:42 pm

1 stop7h 42m

$183

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 3/10

1:50 pm-6:04 pm

1 stop5h 14m

Lambert-St Louis

Wed 3/11

10:45 am-5:39 pm

1 stop5h 54m

$197

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 10/9

7:00 am-7:50 am

Nonstop1h 50m

Lambert-St Louis

Mon 10/13

8:15 am-10:50 am

Nonstop1h 35m

$263

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sat 10/25

6:51 pm-10:02 am

1 stop16h 11m

Lambert-St Louis

Tue 10/28

8:40 pm-10:21 am

2 stops12h 41m

$265

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 10/9

7:00 am-7:50 am

Nonstop1h 50m

Lambert-St Louis

Mon 10/13

6:45 pm-11:05 pm

1 stop3h 20m

$268

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sat 10/11

7:12 am-3:38 pm

1 stop9h 26m

Lambert-St Louis

Sun 10/12

10:57 am-5:46 pm

1 stop29h 49m

$278

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 11/26

1:00 pm-5:09 pm

1 stop5h 09m

Lambert-St Louis

Mon 12/1

6:09 pm-11:05 pm

1 stop3h 56m

$361

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 May is another great option to travel to St. Louis, with average flight prices from Pittsburgh averaging around $297.

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 Thursday when prices can be found for as low as $353. 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 $446. 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 in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $353 when looking at flights departing in the afternoon. In the morning is when there is more demand to fly to St. Louis, so prices are often more expensive at around $424 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 $344 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 $260 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?

You could potentially save up to 34% on your flight if you consider stops on a Pittsburgh to St. Louis flight.

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

As of September 2025, prices for Pittsburgh to St. Louis flights are approximately 24% cheaper 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

$203

Fastest flight time

1h 45m

Direct flights

Every day

Airports in St. Louis

1 airport
The best one-way flight to St. Louis from Pittsburgh in the past 72 hours is $203. The best round-trip flight deal from Pittsburgh to St. Louis found on momondo in the last 72 hours is $284.
The fastest flight from Pittsburgh to St. Louis takes 1h 45m
Direct flights go from Pittsburgh to St. Louis every day.
There is 1 airport near St. Louis: 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 $177Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $241Free CancellationRating
8.0
4,242 reviews
Search Southwest flights
DeltaPriceFrom $258Free CancellationRating
7.9
7,961 reviews
Search Delta flights
United AirlinesPriceFrom $258Free CancellationRating
7.4
8,926 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 5 flights on this route every week with an average price of $346. 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
Florissant
Maryland Heights
O'Fallon
Fenton
Collinsville
Wentzville
Alton
St. Peters
Farmington
Festus
Glencoe
Clayton
Edwardsville
Eureka
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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