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

$79+ 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 5/7. Fares are subject to change and may not be available on all flights or dates of travel.
PIT — STL
Mar 30 — Apr 61
Sun 3/30
Sun 4/6
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 May or February, booked 66 days in advance, depart on a Sunday or Thursday 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 March 25, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$179
(American Airlines)

One-way from

$79
(Mytrip)

Popular in

January

Cheapest in

May

Average price

$385

Good round-trip deal

$299 or less

Good one-way deal

$142 or less
Provider with most accurate pricing for Pittsburgh-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Pittsburgh-Lambert-St Louis flights.
Search Deals
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. 2% potential increase in price ($9 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 March 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 March 25, 2025.

This American Airlines deal was found by Cheapflights users on 3/24. 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 4/294:05 pmPIT - STL
1 stop5h 42mAmerican Airlines
Wed 4/307:19 amSTL - PIT
1 stop4h 44mAmerican Airlines
Deal found 3/24$179
This Mytrip deal was found by Cheapflights users on 3/24. 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 5/77:00 amPIT - STL
1 stop27h 15mSpirit Airlines
Sun 5/1110:10 amSTL - PIT
2 stops28h 48mSpirit Airlines
Deal found 3/24$194
This Southwest deal was found by Cheapflights users on 3/24. 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.
Wed 4/234:00 pmPIT - STL
Nonstop1h 45mSouthwest
Wed 4/308:00 amSTL - PIT
1 stop7h 20mSouthwest
Deal found 3/24$256
This Delta deal was found by Cheapflights users on 3/24. 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.
Fri 6/135:40 amPIT - STL
1 stop4h 59mDelta
Sun 6/157:04 pmSTL - PIT
1 stop4h 33mDelta
Deal found 3/24$259
This Flightnetwork deal was found by Cheapflights users on 3/24. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/49:46 amPIT - STL
1 stop15h 00mFrontier
Sun 4/64:57 pmSTL - PIT
1 stop14h 46mFrontier
Deal found 3/24$277
This Mytrip deal was found by Cheapflights users on 3/24. 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.
Tue 4/88:18 amPIT - STL
1 stop10h 34mMultiple Airlines
Sat 4/126:45 pmSTL - PIT
2 stops26h 50mMultiple Airlines
Deal found 3/24$321
This United deal was found by Cheapflights users on 3/24. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/209:00 amPIT - STL
1 stop6h 45mUnited Airlines
Tue 4/226:30 amSTL - PIT
2 stops15h 51mUnited Airlines
Deal found 3/24$366
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/137:42 pmPIT - STL
2 stops29h 17mAlaska Airlines
Sun 6/157:32 pmSTL - PIT
2 stops25h 58mAlaska Airlines
Deal found 3/24$757

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 March 25, 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

Tue 4/29

4:05 pm-8:47 pm

1 stop5h 42m

Lambert-St Louis

Wed 4/30

7:19 am-1:03 pm

1 stop4h 44m

$179

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 5/7

7:00 am-9:15 am

1 stop27h 15m

Lambert-St Louis

Sun 5/11

10:10 am-3:58 pm

2 stops28h 48m

$194

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 4/23

4:00 pm-4:45 pm

Nonstop1h 45m

Lambert-St Louis

Wed 4/30

8:00 am-4:20 pm

1 stop7h 20m

$256

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 6/13

5:40 am-9:39 am

1 stop4h 59m

Lambert-St Louis

Sun 6/15

7:04 pm-12:37 am

1 stop4h 33m

$259

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 4/4

9:46 am-11:46 pm

1 stop15h 00m

Lambert-St Louis

Sun 4/6

4:57 pm-8:43 am

1 stop14h 46m

$277

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 4/8

8:18 am-5:52 pm

1 stop10h 34m

Lambert-St Louis

Sat 4/12

6:45 pm-10:35 pm

2 stops26h 50m

$321

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sun 4/20

9:00 am-2:45 pm

1 stop6h 45m

Lambert-St Louis

Tue 4/22

6:30 am-11:21 pm

2 stops15h 51m

$366

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Fri 6/13

7:42 pm-11:59 pm

2 stops29h 17m

Lambert-St Louis

Sun 6/15

7:32 pm-10:30 pm

2 stops25h 58m

$757

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 5/7

7:00 am-9:15 am

1 stop27h 15m

$79

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Thu 4/24

5:44 am-9:52 am

1 stop5h 08m

$90

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 16 results
1
2

Compare providers for flights from Pittsburgh to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Pittsburgh to St. Louis in March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Pittsburgh-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Pittsburgh-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Pittsburgh-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Pittsburgh-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Pittsburgh-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 March 21, 2025.

Booking 65 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 March 25, 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 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 March 23, 2025.

Travelers seeking maximum savings on their Pittsburgh to St. Louis flight should consider departing on Monday at noon 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.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

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 March 25, 2025.
Read through reviews of airlines operating flights from Pittsburgh to St. Louis, such as Alaska Airlines, Southwest and Delta. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,782 reviews

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
9,782 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,272 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,890 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,605 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,782 reviews

Overall

8.0

Food

7.1

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

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 5 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 $179, was found to be the cheapest airline from Pittsburgh to St. Louis.Alternate airlines to your destination round-trip include Spirit Airlines and Southwest. Users have found that American Airlines is 49% 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 Spirit Airlines, with whom users have recently found tickets for as low as $79. However, be on the lookout for offers from American Airlines 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 $126. On average you can expect to pay $282. 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
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Glencoe
Alton
Farmington
Chesterfield

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.
Dulles Intl to St. Louis flights
John F Kennedy Intl to Kansas City flights
Newark to Kansas City flights
Newark to St. Louis flights
Dulles Intl to Kansas City flights
John F Kennedy Intl to St. Louis flights
LaGuardia to Kansas City flights
Reagan-National to St. Louis flights
Reagan-National to Kansas City flights
LaGuardia to St. Louis flights
Philadelphia to St. Louis flights
Philadelphia to Kansas City flights
Dulles Intl to Springfield flights
Pittsburgh to Kansas City flights
John F Kennedy Intl to Springfield flights
LaGuardia to Springfield flights
Newark to Springfield flights
Reagan-National to Springfield flights
Harrisburg to Kansas City flights
Allentown to St. Louis flights
Pittsburgh to Springfield flights
Philadelphia to Springfield flights
Harrisburg to Springfield flights
Allentown to Kansas City flights
Harrisburg to St. Louis flights
State College to St. Louis flights
Reagan-National to Joplin flights
Scranton to St. Louis flights
Dulles Intl to Joplin flights
Scranton to Kansas City flights
Newark to Joplin flights
LaGuardia to Joplin flights
State College to Springfield flights
John F Kennedy Intl to Columbia flights
Newark to Columbia flights
LaGuardia to Columbia flights
State College to Kansas City flights
Allentown to Springfield flights
Pittsburgh to Joplin flights
Harrisburg to Joplin flights
Newark to Fort Leonard Wood flights
Dulles Intl to Columbia flights
Elmira to St. Louis flights
Reagan-National to Columbia flights
Erie to St. Louis flights
Philadelphia to Cape Girardeau flights
Philadelphia to Columbia flights
Latrobe to Kansas City flights

Top 5 airlines flying from Pittsburgh to St. Louis

Discover the top 5 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 March 25, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$169Average$281FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$221Average$347FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$253Average$357FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$258Average$398FlexibilityNo cancel feeOn-time69%
DeltaCheapest$258Average$346FlexibilityNo cancel feeOn-timeN/A
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.