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Cheap flights from Pittsburgh to St. Louis from $69

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 12/3. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
Southwest Logo
6:55 pm - 9:55 pmPIT-STL
4h 00m1 stop
Southwest Logo
6:40 am - 12:00 pmSTL-PIT
4h 20m1 stop
$188Southwest
Find Deal
Tue, Jan 27 - Sat, Jan 31
American Airlines Logo
9:45 am - 1:18 pmPIT-STL
4h 33m1 stop
American Airlines Logo
4:49 pm - 9:48 pmSTL-PIT
3h 59m1 stop
$199American Airlines
Find Deal
Tue, Dec 9 - Sat, Dec 13
Delta Logo
5:26 pm - 9:02 pmPIT-STL
4h 36m1 stop
Delta Logo
6:39 am - 12:06 pmSTL-PIT
4h 27m1 stop
$210Delta
Find Deal
Mon, Dec 8 - Sat, Dec 13
Multiple Airlines Logo
2:18 pm - 10:02 amPIT-STL
20h 44m2 stops
Multiple Airlines Logo
5:11 pm - 1:13 pmSTL-PIT
19h 02m1 stop
$211Multiple Airlines
Find Deal
Fri, Jan 9 - Mon, Jan 12
American Airlines Logo
10:10 am - 4:59 pmPIT-STL
7h 49m1 stop
American Airlines Logo
5:02 am - 11:32 amSTL-PIT
5h 30m1 stop
$214American Airlines
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Wed, Dec 3 - Sun, Dec 7
Southwest Logo
7:00 am - 2:35 pmPIT-STL
8h 35m1 stop
Southwest Logo
8:25 am - 11:00 amSTL-PIT
1h 35mnonstop
$218Southwest
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Tue, Dec 9 - Sat, Dec 13
Southwest Logo
12:15 pm - 3:00 pmPIT-STL
3h 45m1 stop
Southwest Logo
10:25 am - 7:20 pmSTL-PIT
7h 55m2 stops
$223Southwest
Find Deal
Tue, Jan 27 - Sat, Jan 31
Delta Logo
6:00 am - 10:45 amPIT-STL
5h 45m1 stop
Delta Logo
7:02 pm - 12:16 amSTL-PIT
4h 14m1 stop
$263Delta
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Tue, Dec 16 - Sun, Dec 21
United Airlines Logo
6:10 am - 10:13 amPIT-STL
5h 03m1 stop
United Airlines Logo
1:15 pm - 9:07 pmSTL-PIT
6h 52m1 stop
$278United Airlines
Find Deal
Tue, Jan 27 - Sat, Jan 31
United Airlines Logo
6:00 am - 10:50 amPIT-STL
5h 50m1 stop
United Airlines Logo
6:35 pm - 11:59 pmSTL-PIT
4h 24m1 stop
$313United Airlines
Find Deal
Tue, Dec 16 - Mon, Dec 22

American Airlines flights from Pittsburgh to St. Louis

Our best American Airlines deals on Pittsburgh to St. Louis flight tickets
American Airlines
Dec 9
PIT9:45 amPittsburgh
4h 33m
1 stop
STL1:18 pmLambert-St Louis
Dec 13
STL4:49 pmLambert-St Louis
3h 59m
1 stop
PIT9:48 pmPittsburgh
$199
Find similar
American Airlines
Dec 3
PIT10:10 amPittsburgh
7h 49m
1 stop
STL4:59 pmLambert-St Louis
Dec 7
STL5:02 amLambert-St Louis
5h 30m
1 stop
PIT11:32 amPittsburgh
$214
Find similar
American Airlines
Dec 4
PIT8:35 amPittsburgh
5h 43m
1 stop
STL1:18 pmLambert-St Louis
Dec 7
STL5:02 amLambert-St Louis
6h 57m
1 stop
PIT12:59 pmPittsburgh
$224
Find similar

Southwest flights from Pittsburgh to St. Louis

Our best Southwest deals on Pittsburgh to St. Louis flight tickets
Southwest
Jan 27
PIT6:55 pmPittsburgh
4h 00m
1 stop
STL9:55 pmLambert-St Louis
Jan 31
STL6:40 amLambert-St Louis
4h 20m
1 stop
PIT12:00 pmPittsburgh
$188
Find similar
Southwest
Dec 9
PIT7:00 amPittsburgh
8h 35m
1 stop
STL2:35 pmLambert-St Louis
Dec 13
STL8:25 amLambert-St Louis
1h 35m
PIT11:00 amPittsburgh
$218
Find similar
Southwest
Jan 27
PIT12:15 pmPittsburgh
3h 45m
1 stop
STL3:00 pmLambert-St Louis
Jan 31
STL10:25 amLambert-St Louis
7h 55m
2 stops
PIT7:20 pmPittsburgh
$223
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 November 4, 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 1/27

6:55 pm-9:55 pm

1 stop4h 00m

Lambert-St Louis

Sat 1/31

6:40 am-12:00 pm

1 stop4h 20m

$188

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 12/9

9:45 am-1:18 pm

1 stop4h 33m

Lambert-St Louis

Sat 12/13

4:49 pm-9:48 pm

1 stop3h 59m

$199

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Mon 12/8

5:26 pm-9:02 pm

1 stop4h 36m

Lambert-St Louis

Sat 12/13

6:39 am-12:06 pm

1 stop4h 27m

$210

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 1/9

2:18 pm-10:02 am

2 stops20h 44m

Lambert-St Louis

Mon 1/12

5:11 pm-1:13 pm

1 stop19h 02m

$211

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 12/3

10:10 am-4:59 pm

1 stop7h 49m

Lambert-St Louis

Sun 12/7

5:02 am-11:32 am

1 stop5h 30m

$214

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 12/9

7:00 am-2:35 pm

1 stop8h 35m

Lambert-St Louis

Sat 12/13

8:25 am-11:00 am

Nonstop1h 35m

$218

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 1/27

12:15 pm-3:00 pm

1 stop3h 45m

Lambert-St Louis

Sat 1/31

10:25 am-7:20 pm

2 stops7h 55m

$223

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 12/16

6:00 am-10:45 am

1 stop5h 45m

Lambert-St Louis

Sun 12/21

7:02 pm-12:16 am

1 stop4h 14m

$263

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 1/27

6:10 am-10:13 am

1 stop5h 03m

Lambert-St Louis

Sat 1/31

1:15 pm-9:07 pm

1 stop6h 52m

$278

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 12/16

6:00 am-10:50 am

1 stop5h 50m

Lambert-St Louis

Mon 12/22

6:35 pm-11:59 pm

1 stop4h 24m

$313

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 $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 $354 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 $247 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 November 2025, prices for Pittsburgh to St. Louis flights are approximately 26% 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

$259

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 $259. The best round-trip flight deal from Pittsburgh to St. Louis found on momondo in the last 72 hours is $325.
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 $171Free CancellationRating
7.2
11,038 reviews
Search American Airlines flights
SouthwestPriceFrom $241Free CancellationRating
8.0
4,238 reviews
Search Southwest flights
DeltaPriceFrom $258Free CancellationRating
7.9
8,002 reviews
Search Delta flights
United AirlinesPriceFrom $258Free CancellationRating
7.4
8,997 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 $348. 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
Wentzville
Fenton
Collinsville
St. Peters
Alton
Farmington
Festus
Glencoe
Edwardsville
Clayton
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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