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Cheap flights from Pittsburgh to St. Louis from $80

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 2/3. 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.
Multiple Airlines Logo
6:00 am - 11:33 pm
PIT
-
STL
18h 33m2 stops
Multiple Airlines Logo
11:18 am - 11:07 pm
STL
-
PIT
10h 49m1 stop
$180Multiple Airlines
Wed, Jan 28 - Fri, Jan 30
Multiple Airlines Logo
5:45 am - 10:27 pm
PIT
-
STL
17h 42m1 stop
Multiple Airlines Logo
3:49 pm - 11:25 pm
STL
-
PIT
6h 36m1 stop
$187Multiple Airlines
Tue, Feb 24 - Fri, Feb 27
Multiple Airlines Logo
6:00 am - 6:51 am
PIT
-
STL
25h 51m2 stops
Multiple Airlines Logo
3:49 pm - 11:25 pm
STL
-
PIT
6h 36m1 stop
$200Multiple Airlines
Tue, Feb 24 - Fri, Feb 27
Multiple Airlines Logo
6:00 am - 10:27 pm
PIT
-
STL
17h 27m2 stops
Multiple Airlines Logo
3:49 pm - 12:35 pm
STL
-
PIT
19h 46m1 stop
$202Multiple Airlines
Tue, Feb 24 - Fri, Feb 27
Frontier Logo
11:19 am - 12:27 am
PIT
-
STL
14h 08m1 stop
Frontier Logo
3:49 pm - 1:24 pm
STL
-
PIT
20h 35m1 stop
$204Frontier
Fri, Feb 27 - Sun, Mar 1
Multiple Airlines Logo
10:45 am - 11:33 pm
PIT
-
STL
13h 48m1 stop
Multiple Airlines Logo
9:45 pm - 9:40 am
STL
-
PIT
34h 55m2 stops
$214Multiple Airlines
Thu, Jan 22 - Mon, Jan 26
Multiple Airlines Logo
6:00 am - 6:51 am
PIT
-
STL
25h 51m2 stops
Multiple Airlines Logo
3:49 pm - 11:25 pm
STL
-
PIT
6h 36m1 stop
$217Multiple Airlines
Tue, Feb 17 - Wed, Feb 18
Multiple Airlines Logo
5:32 am - 11:33 pm
PIT
-
STL
19h 01m1 stop
Multiple Airlines Logo
10:16 am - 9:40 am
STL
-
PIT
22h 24m2 stops
$218Multiple Airlines
Fri, Feb 6 - Mon, Feb 9
Multiple Airlines Logo
9:09 pm - 8:56 am
PIT
-
STL
36h 47m2 stops
Multiple Airlines Logo
3:49 pm - 11:25 pm
STL
-
PIT
6h 36m1 stop
$219Multiple Airlines
Thu, Feb 19 - Tue, Feb 24
Multiple Airlines Logo
10:45 am - 11:33 pm
PIT
-
STL
13h 48m1 stop
Multiple Airlines Logo
3:49 pm - 4:45 pm
STL
-
PIT
23h 56m1 stop
$228Multiple Airlines
Thu, Feb 5 - Tue, Feb 10

United Airlines flights from Pittsburgh to St. Louis

Our best United Airlines deals on Pittsburgh to St. Louis flight tickets
United Airlines
Jan 20
PIT5:46 pmPittsburgh
6h 12m
1 stop
STL10:58 pmLambert-St Louis
Jan 21
STL11:22 amLambert-St Louis
6h 47m
1 stop
PIT7:09 pmPittsburgh
$421
Find similar
United Airlines
Jan 20
PIT6:40 pmPittsburgh
6h 19m
1 stop
STL11:59 pmLambert-St Louis
Jan 23
STL1:15 pmLambert-St Louis
6h 26m
1 stop
PIT8:41 pmPittsburgh
$459
Find similar
United Airlines
Jan 20
PIT8:56 amPittsburgh
6h 34m
1 stop
STL2:30 pmLambert-St Louis
Jan 21
STL6:30 amLambert-St Louis
6h 34m
2 stops
PIT2:04 pmPittsburgh
$678
Find similar

American Airlines flights from Pittsburgh to St. Louis

Our best American Airlines deals on Pittsburgh to St. Louis flight tickets
American Airlines
Feb 16
PIT6:30 amPittsburgh
4h 33m
1 stop
STL10:03 amLambert-St Louis
Feb 17
STL6:06 amLambert-St Louis
5h 53m
1 stop
PIT12:59 pmPittsburgh
$289
Find similar
American Airlines
Jan 17
PIT1:25 pmPittsburgh
4h 36m
1 stop
STL5:01 pmLambert-St Louis
Jan 20
STL3:54 pmLambert-St Louis
6h 35m
1 stop
PIT11:29 pmPittsburgh
$321
Find similar
American Airlines
Jan 10
PIT10:27 amPittsburgh
7h 35m
1 stop
STL5:02 pmLambert-St Louis
Jan 13
STL5:59 pmLambert-St Louis
4h 11m
1 stop
PIT11:10 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 January 7, 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

Wed 1/28

6:00 am-11:33 pm

2 stops18h 33m

Lambert-St Louis

Fri 1/30

11:18 am-11:07 pm

1 stop10h 49m

$180

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 2/24

5:45 am-10:27 pm

1 stop17h 42m

Lambert-St Louis

Fri 2/27

3:49 pm-11:25 pm

1 stop6h 36m

$187

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 2/24

6:00 am-6:51 am

2 stops25h 51m

Lambert-St Louis

Fri 2/27

3:49 pm-11:25 pm

1 stop6h 36m

$200

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 2/24

6:00 am-10:27 pm

2 stops17h 27m

Lambert-St Louis

Fri 2/27

3:49 pm-12:35 pm

1 stop19h 46m

$202

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 2/27

11:19 am-12:27 am

1 stop14h 08m

Lambert-St Louis

Sun 3/1

3:49 pm-1:24 pm

1 stop20h 35m

$204

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 1/22

10:45 am-11:33 pm

1 stop13h 48m

Lambert-St Louis

Mon 1/26

9:45 pm-9:40 am

2 stops34h 55m

$214

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 2/17

6:00 am-6:51 am

2 stops25h 51m

Lambert-St Louis

Wed 2/18

3:49 pm-11:25 pm

1 stop6h 36m

$217

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 2/6

5:32 am-11:33 pm

1 stop19h 01m

Lambert-St Louis

Mon 2/9

10:16 am-9:40 am

2 stops22h 24m

$218

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 2/19

9:09 pm-8:56 am

2 stops36h 47m

Lambert-St Louis

Tue 2/24

3:49 pm-11:25 pm

1 stop6h 36m

$219

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 2/5

10:45 am-11:33 pm

1 stop13h 48m

Lambert-St Louis

Tue 2/10

3:49 pm-4:45 pm

1 stop23h 56m

$228

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 $336. 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 $326 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 $425 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 $334 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 31% 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, Wed, Thu, Fri and Sat

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 $321.
The fastest flight from Pittsburgh to St. Louis takes 1h 45m
Direct flights go from Pittsburgh to St. Louis on Monday, Tuesday, Wednesday, Thursday, Friday and Saturday. 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
11,095 reviews
Search American Airlines flights
SouthwestPriceFrom $241Free CancellationRating
8.0
4,248 reviews
Search Southwest flights
DeltaPriceFrom $258Free CancellationRating
7.9
8,025 reviews
Search Delta flights
United AirlinesPriceFrom $258Free CancellationRating
7.4
9,139 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 $341. 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
O'Fallon
Maryland Heights
Florissant
Fenton
Collinsville
St. Peters
Wentzville
Alton
Farmington
Clayton
Eureka
Festus
Edwardsville
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.
Start using Trips
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