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$91+ 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 9/3. Fares are subject to change and may not be available on all flights or dates of travel.
PIT — STL
Jul 6 — Jul 131
Sun 7/6
Sun 7/13
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 44 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 July 1, 2025.

Round-trip from

$171
(American Airlines)

One-way from

$91
(American Airlines)

Popular in

January

Cheapest in

April

Average price

$333

Good round-trip deal

$375 or less

Good one-way deal

$223 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. 3% potential increase in price ($12 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 July 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 July 1, 2025.

This American Airlines deal was found by Cheapflights users on 6/30. 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 7/305:02 pmPIT - STL
1 stop7h 49mAmerican Airlines
Wed 8/66:06 amSTL - PIT
1 stop7h 45mAmerican Airlines
Deal found 6/30$171
This Southwest deal was found by Cheapflights users on 6/30. 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 8/74:00 pmPIT - STL
Nonstop1h 45mSouthwest
Mon 8/118:25 amSTL - PIT
Nonstop1h 35mSouthwest
Deal found 6/30$197
This Delta deal was found by Cheapflights users on 6/30. 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.
Tue 10/711:45 amPIT - STL
1 stop7h 17mDelta
Mon 10/135:40 pmSTL - PIT
1 stop4h 29mDelta
Deal found 6/30$207
This Mytrip deal was found by Cheapflights users on 6/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/306:20 amPIT - STL
3 stops28h 32mSpirit Airlines
Wed 8/611:24 amSTL - PIT
1 stop6h 52mSpirit Airlines
Deal found 6/30$243
This FlightHub deal was found by Cheapflights users on 7/1. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/245:28 pmPIT - STL
1 stop16h 39mFrontier
Sun 10/267:52 pmSTL - PIT
1 stop19h 41mFrontier
Deal found 7/1$281
This Booking.com deal was found by Cheapflights users on 7/1. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/1310:05 amPIT - STL
1 stop10h 26mMultiple Airlines
Wed 7/1611:24 amSTL - PIT
1 stop6h 52mMultiple Airlines
Deal found 7/1$282

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 July 1, 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

Wed 7/30

5:02 pm-11:51 pm

1 stop7h 49m

Lambert-St Louis

Wed 8/6

6:06 am-2:51 pm

1 stop7h 45m

$171

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 8/7

4:00 pm-4:45 pm

Nonstop1h 45m

Lambert-St Louis

Mon 8/11

8:25 am-11:00 am

Nonstop1h 35m

$197

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 7/30

6:20 am-9:52 am

3 stops28h 32m

Lambert-St Louis

Wed 8/6

11:24 am-7:16 pm

1 stop6h 52m

$243

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 8/7

8:25 pm-11:53 pm

1 stop4h 28m

Lambert-St Louis

Mon 8/11

7:00 am-12:38 pm

1 stop4h 38m

$248

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 10/24

5:28 pm-9:07 am

1 stop16h 39m

Lambert-St Louis

Sun 10/26

7:52 pm-4:33 pm

1 stop19h 41m

$281

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sun 7/13

10:05 am-7:31 pm

1 stop10h 26m

Lambert-St Louis

Wed 7/16

11:24 am-7:16 pm

1 stop6h 52m

$282

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 9/3

12:35 pm-8:32 pm

1 stop8h 57m

$91

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 10/15

2:10 pm-3:00 pm

Nonstop1h 50m

$99

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 9/4

8:30 am-2:37 pm

1 stop7h 07m

$104

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 9/3

7:08 am-1:35 pm

3 stops31h 27m

$117

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 12 results
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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 June 27, 2025.

Booking 44 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 July 1, 2025.

A simple way to save on the total cost of your ticket is to fly from Pittsburgh to St. Louis at noon. If you’re flexible enough to do this you can expect to save up to 16% 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 June 29, 2025.

Travelers seeking maximum savings on their Pittsburgh to St. Louis flight should consider departing on Wednesday evenings 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 July 1, 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
4,275 reviews

Entertainment

7.6

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Southwest
8.0
Very good
4,275 reviews
Southwest
8.0
Very good
4,275 reviews

Entertainment

7.6

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Delta
8.0
Very good
7,974 reviews
Southwest
8.0
Very good
4,275 reviews

Entertainment

7.6

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
United Airlines
7.4
Good
8,858 reviews
Southwest
8.0
Very good
4,275 reviews

Entertainment

7.6

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,275 reviews

Entertainment

7.6

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
Spirit Airlines
6.3
Okay
8,100 reviews
Southwest
8.0
Very good
4,275 reviews

Entertainment

7.6

Overall

8.0

Food

7.0

Crew

8.6

Boarding

8.2

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 $171, was found to be the cheapest airline from Pittsburgh to St. Louis.Alternate airlines to your destination round-trip include Southwest and Spirit Airlines. Users have found that American Airlines is 50% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from Pittsburgh to St. Louis one-way?

    The cheapest airline one-way is American Airlines, with whom users have recently found tickets for as low as $91. However, be on the lookout for offers from Southwest and Delta, as they are both options that can get you from Pittsburgh to St. Louis for a low price.

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

    The cheapest flight price from Pittsburgh to St. Louis is $154. On average you can expect to pay $353. The most popular route, (Pittsburgh - Lambert-St Louis), can usually be booked for $197.

  • 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 Pittsburgh?

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

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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 July 1, 2025.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest$221Average$351FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$245Average$344FlexibilityNo cancel feeOn-time63%
DeltaCheapest$258Average$341FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$258Average$408FlexibilityNo cancel feeOn-time69%

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