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Cheap flights from Pittsburgh to St. Louis from $67

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 2/20. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
6:55 pm - 9:55 pm
PIT
-
STL
4h 00m1 stop
Southwest Logo
8:15 am - 12:55 pm
STL
-
PIT
3h 40m1 stop
$153Southwest
Tue, Jan 20 - Tue, Jan 27
American Airlines Logo
7:15 am - 2:57 pm
PIT
-
STL
8h 42m1 stop
American Airlines Logo
6:00 am - 12:55 pm
STL
-
PIT
5h 55m1 stop
$159American Airlines
Wed, Feb 4 - Wed, Feb 11
Multiple Airlines Logo
6:00 am - 6:51 am
PIT
-
STL
25h 51m2 stops
Multiple Airlines Logo
5:42 pm - 4:45 pm
STL
-
PIT
22h 03m1 stop
$170Multiple Airlines
Tue, Jan 20 - Tue, Jan 27
Southwest Logo
6:55 pm - 9:55 pm
PIT
-
STL
4h 00m1 stop
Southwest Logo
1:30 pm - 9:40 pm
STL
-
PIT
7h 10m1 stop
$172Southwest
Mon, Jan 26 - Tue, Jan 27
American Airlines Logo
8:50 am - 2:57 pm
PIT
-
STL
7h 07m1 stop
American Airlines Logo
6:52 am - 2:47 pm
STL
-
PIT
6h 55m1 stop
$175American Airlines
Mon, Jan 26 - Tue, Jan 27
Multiple Airlines Logo
5:32 am - 11:33 pm
PIT
-
STL
19h 01m1 stop
Multiple Airlines Logo
5:42 pm - 9:40 am
STL
-
PIT
38h 58m2 stops
$178Multiple Airlines
Thu, Jan 22 - Mon, Jan 26
American Airlines Logo
7:04 pm - 11:12 pm
PIT
-
STL
5h 08m1 stop
American Airlines Logo
7:00 am - 2:41 pm
STL
-
PIT
6h 41m1 stop
$191American Airlines
Mon, Jan 19 - Mon, Jan 26
Multiple Airlines Logo
4:29 pm - 9:21 am
PIT
-
STL
17h 52m1 stop
Multiple Airlines Logo
5:42 pm - 4:45 pm
STL
-
PIT
22h 03m1 stop
$196Multiple Airlines
Sun, Jan 25 - Tue, Jan 27
Multiple Airlines Logo
10:45 am - 11:33 pm
PIT
-
STL
13h 48m1 stop
Multiple Airlines Logo
8:59 am - 9:58 pm
STL
-
PIT
11h 59m1 stop
$199Multiple Airlines
Tue, Feb 3 - Sun, Feb 8
Multiple Airlines Logo
5:50 pm - 11:33 pm
PIT
-
STL
30h 43m2 stops
Multiple Airlines Logo
3:49 pm - 5:38 pm
STL
-
PIT
24h 49m1 stop
$200Multiple Airlines
Wed, Feb 4 - Wed, Feb 11

American Airlines flights from Pittsburgh to St. Louis

Our best American Airlines deals on Pittsburgh to St. Louis flight tickets
American Airlines
Feb 4
PIT11:43 amPittsburgh
4h 07m
1 stop
STL2:50 pmLambert-St Louis
Feb 11
STL11:05 amLambert-St Louis
6h 05m
1 stop
PIT6:10 pmPittsburgh
$159
Find similar
American Airlines
Jan 26
PIT8:50 amPittsburgh
7h 07m
1 stop
STL2:57 pmLambert-St Louis
Jan 27
STL6:52 amLambert-St Louis
6h 55m
1 stop
PIT2:47 pmPittsburgh
$175
Find similar
American Airlines
Jan 19
PIT7:04 pmPittsburgh
5h 08m
1 stop
STL11:12 pmLambert-St Louis
Jan 26
STL7:00 amLambert-St Louis
6h 41m
1 stop
PIT2:41 pmPittsburgh
$191
Find similar

United Airlines flights from Pittsburgh to St. Louis

Our best United Airlines deals on Pittsburgh to St. Louis flight tickets
United Airlines
Feb 12
PIT5:56 pmPittsburgh
4h 09m
1 stop
STL9:05 pmLambert-St Louis
Feb 17
STL6:25 amLambert-St Louis
5h 44m
1 stop
PIT1:09 pmPittsburgh
$226
Find similar
United Airlines
Jan 22
PIT8:56 amPittsburgh
6h 34m
1 stop
STL2:30 pmLambert-St Louis
Jan 26
STL9:57 amLambert-St Louis
5h 47m
1 stop
PIT4:44 pmPittsburgh
$261
Find similar
United Airlines
Jan 3
PIT10:55 amPittsburgh
6h 32m
1 stop
STL4:27 pmLambert-St Louis
Jan 10
STL8:30 amLambert-St Louis
4h 34m
1 stop
PIT2:04 pmPittsburgh
$351
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 December 23, 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 1/20

6:55 pm-9:55 pm

1 stop4h 00m

Lambert-St Louis

Tue 1/27

8:15 am-12:55 pm

1 stop3h 40m

$153

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 2/4

7:15 am-2:57 pm

1 stop8h 42m

Lambert-St Louis

Wed 2/11

6:00 am-12:55 pm

1 stop5h 55m

$159

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 1/20

6:00 am-6:51 am

2 stops25h 51m

Lambert-St Louis

Tue 1/27

5:42 pm-4:45 pm

1 stop22h 03m

$170

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Mon 1/26

6:55 pm-9:55 pm

1 stop4h 00m

Lambert-St Louis

Tue 1/27

1:30 pm-9:40 pm

1 stop7h 10m

$172

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Mon 1/26

8:50 am-2:57 pm

1 stop7h 07m

Lambert-St Louis

Tue 1/27

6:52 am-2:47 pm

1 stop6h 55m

$175

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 1/22

5:32 am-11:33 pm

1 stop19h 01m

Lambert-St Louis

Mon 1/26

5:42 pm-9:40 am

2 stops38h 58m

$178

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Mon 1/19

7:04 pm-11:12 pm

1 stop5h 08m

Lambert-St Louis

Mon 1/26

7:00 am-2:41 pm

1 stop6h 41m

$191

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sun 1/25

4:29 pm-9:21 am

1 stop17h 52m

Lambert-St Louis

Tue 1/27

5:42 pm-4:45 pm

1 stop22h 03m

$196

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 2/3

10:45 am-11:33 pm

1 stop13h 48m

Lambert-St Louis

Sun 2/8

8:59 am-9:58 pm

1 stop11h 59m

$199

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 2/4

5:50 pm-11:33 pm

2 stops30h 43m

Lambert-St Louis

Wed 2/11

3:49 pm-5:38 pm

1 stop24h 49m

$200

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 Thursday when prices can be found for as low as $344. 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 $331 when looking at flights departing at noon. In the evening is when there is more demand to fly to St. Louis, so prices are often more expensive at around $437 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?

You could potentially save up to 9% 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 December 2025, prices for Pittsburgh to St. Louis flights are approximately 102% 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

$219

Fastest flight time

1h 50m

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 $219. The best round-trip flight deal from Pittsburgh to St. Louis found on momondo in the last 72 hours is $358.
The fastest flight from Pittsburgh to St. Louis takes 1h 50m
Direct flights go from Pittsburgh to St. Louis every day.
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 50m, 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 $171Free CancellationRating
7.2
11,054 reviews
Search American Airlines flights
SouthwestPriceFrom $241Free CancellationRating
8.0
4,253 reviews
Search Southwest flights
DeltaPriceFrom $258Free CancellationRating
7.9
8,014 reviews
Search Delta flights
United AirlinesPriceFrom $258Free CancellationRating
7.4
9,105 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 4 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
Maryland Heights
O'Fallon
Florissant
Fenton
St. Peters
Wentzville
Collinsville
Alton
Farmington
Clayton
Festus
Glencoe
Eureka
Edwardsville
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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