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St. Louis

$82+ Cheap flights from Pittsburgh to St. Louis (PIT - STL)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
PIT — STL
ago. 19 — ago. 261
mar. 8/19
mar. 8/26
1 adult, Economy
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Cheapflights Tip: The best prices from Pittsburgh to Lambert-St Louis are usually found in April or May, booked 63 days in advance, depart on a Thursday or Wednesday and return on a Wednesday

Cheap flight deals from Pittsburgh to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Pittsburgh (PIT) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated agosto 14, 2025.

Round-trip from

$171
(American Airlines)

One-way from

$82
(Frontier)

Popular in

January

Cheapest in

April

Average price

$366

Good round-trip deal

$251 or less

Good one-way deal

$142 or less
From Pittsburgh to Lambert-St Louis
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One-way flight from Pittsburgh to Lambert-St Louis
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Highest demand for flights based on searches. 4% potential increase in price ($16 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Pittsburgh to Lambert-St Louis.
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Price to beat on a one-way flight from Pittsburgh to Lambert-St Louis.
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Find flight deals from Pittsburgh to St. Louis

Cheapest flights from Pittsburgh to St. Louis
Explore the most affordable flight options available from Pittsburgh to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on agosto 14, 2025.

This American Airlines deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 10/75:06 pmPIT - STL
1 stop7h 48mAmerican Airlines
jue. 10/96:00 amSTL - PIT
1 stop7h 42mAmerican Airlines
Deal found 8/12$171
This American Airlines deal was found by Cheapflights users on 8/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/210:35 amPIT - STL
1 stop6h 11mAmerican Airlines
lun. 10/66:00 amSTL - PIT
1 stop7h 42mAmerican Airlines
Deal found 8/14$174
This Southwest deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/26:20 amPIT - STL
1 stop3h 30mSouthwest
lun. 10/68:15 amSTL - PIT
Nonstop1h 35mSouthwest
Deal found 8/11$177
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/57:55 amPIT - STL
1 stop6h 10mSouthwest
mar. 11/186:15 pmSTL - PIT
Nonstop1h 35mSouthwest
Deal found 8/13$183
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 11/53:35 pmPIT - STL
Nonstop1h 50mSouthwest
mar. 11/116:15 pmSTL - PIT
Nonstop1h 35mSouthwest
Deal found 8/13$189
This Delta deal was found by Cheapflights users on 8/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/37:12 amPIT - STL
1 stop6h 19mDelta
dom. 10/56:01 amSTL - PIT
1 stop5h 34mDelta
Deal found 8/11$197
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/91:05 pmPIT - STL
Nonstop1h 45mSouthwest
mar. 9/161:35 pmSTL - PIT
1 stop6h 45mSouthwest
Deal found 8/12$213
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/96:20 amPIT - STL
1 stop3h 30mSouthwest
dom. 10/128:55 amSTL - PIT
Nonstop1h 40mSouthwest
Deal found 8/12$214
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/131:30 pmPIT - STL
Nonstop1h 45mSouthwest
lun. 9/158:25 amSTL - PIT
Nonstop1h 35mSouthwest
Deal found 8/12$217
This Southwest deal was found by Cheapflights users on 8/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 9/1211:50 amPIT - STL
2 stops7h 45mSouthwest
dom. 9/148:35 amSTL - PIT
Nonstop1h 35mSouthwest
Deal found 8/13$219
This Southwest deal was found by Cheapflights users on 8/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/82:10 pmPIT - STL
Nonstop1h 50mSouthwest
dom. 10/128:55 amSTL - PIT
Nonstop1h 40mSouthwest
Deal found 8/12$220

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated agosto 14, 2025.
Use the filters below to find and compare flights from Pittsburgh to St. Louis that are best for you.

Fly from

Pittsburgh

Fly to

St. Louis

Route

Depart

Return

Price

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

mar. 10/7

7:17 am-1:44 pm

1 stop7h 27m

Lambert-St Louis

jue. 10/9

6:00 am-2:42 pm

1 stop7h 42m

$171

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

mar. 10/28

7:35 am-1:44 pm

1 stop7h 09m

Lambert-St Louis

mar. 11/4

6:00 am-3:33 pm

1 stop8h 33m

$171

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

mié. 11/5

12:21 pm-8:23 pm

1 stop9h 02m

Lambert-St Louis

mar. 11/18

6:00 am-3:33 pm

1 stop8h 33m

$171

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

mar. 10/7

6:09 am-1:44 pm

1 stop8h 35m

Lambert-St Louis

lun. 10/13

7:16 am-4:34 pm

1 stop8h 18m

$171

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

mié. 11/5

8:15 am-4:47 pm

1 stop9h 32m

Lambert-St Louis

mar. 11/11

6:00 am-4:35 pm

1 stop9h 35m

$171

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

vie. 9/26

6:18 pm-11:07 pm

1 stop5h 49m

Lambert-St Louis

lun. 9/29

6:05 am-2:44 pm

1 stop7h 39m

$174

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

jue. 9/4

12:35 pm-8:32 pm

1 stop8h 57m

Lambert-St Louis

dom. 9/7

6:05 am-12:16 pm

1 stop5h 11m

$174

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

jue. 10/2

5:34 pm-11:53 pm

1 stop7h 19m

Lambert-St Louis

lun. 10/6

6:00 am-2:42 pm

1 stop7h 42m

$174

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

dom. 9/28

10:24 am-1:02 pm

1 stop27h 38m

$84

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

dom. 11/9

7:08 pm-1:17 pm

1 stop19h 09m

$84

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 19 results
1
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Best time to book a flight from Pittsburgh to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Pittsburgh with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Pittsburgh to St. Louis

How far ahead should I book a flight from Pittsburgh to St. Louis?

Use this chart to determine the optimal time to book a round-trip flight from Pittsburgh to St. Louis. Price data was last updated on August 8, 2025.

Booking 62 days in advance of your planned departure date is, on average, the best time to get cheap flights from Pittsburgh to St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Pittsburgh to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Pittsburgh to St. Louis (average of $311). Flying from Pittsburgh to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PIT to STL?

Find hourly flight availability from Pittsburgh to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated agosto 14, 2025.

A simple way to save on the total cost of your ticket is to fly from Pittsburgh to St. Louis in the afternoon. If you’re flexible enough to do this you can expect to save up to 17% on your trip compared to booking a flight in the morning.

What is the cheapest day to fly from Pittsburgh to St. Louis?

Use this chart to determine the cheapest time to fly round-trip from Pittsburgh to St. Louis. Price data was last updated on August 10, 2025.

Travelers seeking maximum savings on their Pittsburgh to St. Louis flight should consider departing on Thursday afternoons when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated agosto 14, 2025.
Read reviews from past customers who have flown Southwest, Delta, and United Airlines from Pittsburgh to St. Louis. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,916 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Overall

8.0

Boarding

8.1

Comfort

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Pittsburgh to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How popular is this Pittsburgh to St. Louis flight route?

    This flight path from Pittsburgh to Lambert-St Louis was viewed by 7 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines flying from Pittsburgh to St. Louis round-trip?

    American Airlines, at $177, was found to be the cheapest airline from Pittsburgh to St. Louis.Alternate airlines to your destination round-trip include Southwest and Delta. Users have found that American Airlines is 48% cheaper than the other options available to this destination.

  • What are the cheapest flights from Pittsburgh to St. Louis?

    The cheapest flight price from Pittsburgh to St. Louis is $141. On average you can expect to pay $213. The most popular route, (Pittsburgh - Lambert-St Louis), can usually be booked for $177.

  • Can I find deals for flights from Pittsburgh to St. Louis that include hotel bookings?

    Yes. In addition to deals on Pittsburgh to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Pittsburgh to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Pittsburgh to St. Louis.

  • Can I find deals for business class flights from Pittsburgh to St. Louis?

    Yes. Cheapflights offers flight deals from Pittsburgh to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Pittsburgh to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Pittsburgh to St. Louis (average of $311). Flying from Pittsburgh to St. Louis in March is currently the most expensive (average of $356). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Pittsburgh to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Pittsburgh to St. Louis

Discover the top 4 airlines that operate flights from Pittsburgh to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated agosto 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$177Average$351FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$244Average$342FlexibilityNo cancel feeOn-time63%
DeltaCheapest$258Average$336FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$258Average$408FlexibilityNo cancel feeOn-time69%

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