HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
St. Louis

$68+ 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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
PIT — STL
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Pittsburgh to St. Louis with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Pittsburgh to Lambert-St Louis are usually found in April or May, booked 34 days in advance, depart on a Thursday or Wednesday and return on a Tuesday

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 September 17, 2025.

Round-trip from

$159
(American Airlines)

One-way from

$68
(United Airlines)

Popular in

January

Cheapest in

April

Average price

$364

Good round-trip deal

$284 or less

Good one-way deal

$203 or less
From Pittsburgh to Lambert-St Louis
Search Deals
One-way flight from Pittsburgh to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($26 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from Pittsburgh to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from Pittsburgh to Lambert-St Louis.
Search Deals

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 September 17, 2025.

This American Airlines deal was found by Cheapflights users on 9/15. 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.
Tue 10/285:06 pmPIT - STL
1 stop6h 49mAmerican Airlines
Tue 11/43:38 pmSTL - PIT
1 stop4h 37mAmerican Airlines
Deal found 9/15$159
This United Airlines deal was found by Cheapflights users on 9/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/232:11 pmPIT - STL
1 stop4h 28mUnited Airlines
Tue 12/25:27 pmSTL - PIT
1 stop5h 11mUnited Airlines
Deal found 9/14$164
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Tue 10/712:26 pmPIT - STL
1 stop4h 44mAmerican Airlines
Mon 10/137:16 amSTL - PIT
1 stop8h 18mAmerican Airlines
Deal found 9/15$171
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Tue 10/75:06 pmPIT - STL
1 stop7h 48mAmerican Airlines
Wed 10/86:00 amSTL - PIT
1 stop7h 42mAmerican Airlines
Deal found 9/15$183
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Thu 10/97:17 amPIT - STL
1 stop7h 27mAmerican Airlines
Mon 10/136:00 amSTL - PIT
1 stop7h 42mAmerican Airlines
Deal found 9/16$184
This Delta deal was found by Cheapflights users on 9/15. 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.
Thu 12/412:00 pmPIT - STL
1 stop6h 57mDelta
Sun 12/76:40 amSTL - PIT
1 stop3h 32mDelta
Deal found 9/15$197
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Mon 11/176:35 pmPIT - STL
1 stop5h 32mAmerican Airlines
Tue 11/186:00 amSTL - PIT
1 stop8h 33mAmerican Airlines
Deal found 9/16$228
This American Airlines deal was found by Cheapflights users on 9/16. 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.
Mon 10/137:05 pmPIT - STL
1 stop4h 50mAmerican Airlines
Wed 10/156:03 amSTL - PIT
1 stop4h 41mAmerican Airlines
Deal found 9/16$234
This American Airlines deal was found by Cheapflights users on 9/15. 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.
Wed 10/83:12 pmPIT - STL
1 stop6h 14mAmerican Airlines
Fri 10/104:45 pmSTL - PIT
1 stop5h 08mAmerican Airlines
Deal found 9/15$239
This Southwest deal was found by Cheapflights users on 9/16. 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.
Thu 10/97:00 amPIT - STL
Nonstop1h 50mSouthwest
Mon 10/138:15 amSTL - PIT
Nonstop1h 35mSouthwest
Deal found 9/16$263
This Kiwi.com deal was found by Cheapflights users on 9/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/256:51 pmPIT - STL
1 stop16h 11mMultiple Airlines
Tue 10/288:40 pmSTL - PIT
2 stops12h 41mMultiple Airlines
Deal found 9/16$265

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 September 17, 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

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

Sat 10/25

6:09 am-1:35 pm

1 stop8h 26m

Lambert-St Louis

Tue 10/28

7:16 am-4:34 pm

1 stop8h 18m

$183

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 10/9

6:09 am-1:44 pm

1 stop8h 35m

Lambert-St Louis

Mon 10/13

2:15 pm-11:19 pm

1 stop8h 04m

$183

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 12/4

12:00 pm-5:57 pm

1 stop6h 57m

Lambert-St Louis

Sun 12/7

6:40 am-11:12 am

1 stop3h 32m

$197

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Mon 11/17

6:35 pm-11:07 pm

1 stop5h 32m

Lambert-St Louis

Tue 11/18

6:00 am-3:33 pm

1 stop8h 33m

$228

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 11/7

6:36 pm-11:56 pm

1 stop6h 20m

Lambert-St Louis

Mon 11/10

8:39 am-6:06 pm

1 stop8h 27m

$246

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Mon 10/13

7:05 pm-10:55 pm

1 stop4h 50m

Lambert-St Louis

Wed 10/15

7:16 am-5:04 pm

1 stop8h 48m

$246

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 10/24

5:06 pm-8:26 pm

1 stop4h 20m

Lambert-St Louis

Mon 10/27

6:00 am-2:42 pm

1 stop7h 42m

$246

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 10/7

2:10 pm-3:00 pm

Nonstop1h 50m

Lambert-St Louis

Wed 10/8

6:40 pm-9:15 pm

Nonstop1h 35m

$263

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sat 10/25

1:30 pm-2:15 pm

Nonstop1h 45m

Lambert-St Louis

Tue 10/28

6:40 pm-9:15 pm

Nonstop1h 35m

$263

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 23 results
1
2
3

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 September 12, 2025.

Booking 34 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 September 17, 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 September 14, 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 September 17, 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
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,961 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,926 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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 6 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from Pittsburgh to St. Louis?

    United Airlines, American Airlines, and Delta can get you from Pittsburgh to St. Louis in just under 4h 28m. Your travel time can differ by up to 3h 58m. Airlines will cover a distance of 552 mi. This flight may include one or multiple stops.

  • 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 $88. On average you can expect to pay $310. The most popular route, (Pittsburgh - Lambert-St Louis), can usually be booked for $135.

  • 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
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Pittsburgh to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Kansas City flights
Newark to Kansas City flights
LaGuardia to Kansas City flights
LaGuardia to St. Louis flights
Newark to St. Louis flights
John F Kennedy Intl to St. Louis flights
Dulles Intl to St. Louis flights
Dulles Intl to Kansas City flights
Reagan-National to St. Louis flights
Reagan-National to Kansas City flights
Philadelphia to Kansas City flights
Philadelphia to St. Louis flights
Pittsburgh to Kansas City flights
Dulles Intl to Springfield flights
Reagan-National to Springfield flights
LaGuardia to Springfield flights
John F Kennedy Intl to Springfield flights
Newark to Springfield flights
Harrisburg to Kansas City flights
Harrisburg to St. Louis flights
Harrisburg to Springfield flights
Scranton to Kansas City flights
Philadelphia to Springfield flights
Reagan-National to Columbia flights
Dulles Intl to Columbia flights
Pittsburgh to Springfield flights
Allentown to Kansas City flights
Scranton to St. Louis flights
State College to St. Louis flights
State College to Kansas City flights
Elmira to St. Louis flights
Allentown to St. Louis flights
Philadelphia to Columbia flights
Allentown to Springfield flights
State College to Springfield flights
LaGuardia to Joplin flights
Philadelphia to Joplin flights
Newark to Joplin flights
Scranton to Springfield flights
LaGuardia to Columbia flights
Elmira to Kansas City flights
Newark to Columbia flights
Reagan-National to Joplin flights
John F Kennedy Intl to Columbia flights
Allentown to Columbia flights
Pittsburgh to Joplin flights
Dulles Intl to Joplin flights
Scranton to Joplin flights
Allentown to Joplin flights

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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$177Average$331FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$241Average$346FlexibilityNo cancel feeOn-time63%
DeltaCheapest$258Average$318FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$258Average$408FlexibilityNo cancel feeOn-time69%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.