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St. Louis

$58+ Cheap flights from Pennsylvania to St. Louis (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 9/29. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — STL
Jul 6 — Jul 131
Sun 7/6
Sun 7/13
1 adult, Economy
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Cheap flight deals from Pennsylvania to St. Louis

Keep the following information in mind while searching for Pennsylvania to St. Louis flight deals. Data was last updated July 1, 2025.

Round-trip from

$171
(American Airlines)

One-way from

$58
(Priceline)

Popular in

May

Cheapest in

August

Average price

$271

Good round-trip deal

$348 or less

Good one-way deal

$180 or less
From Pennsylvania to Lambert-St Louis
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One-way flight from Pennsylvania to Lambert-St Louis
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Highest demand for flights based on searches. 5% potential increase in price ($22 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 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 Pennsylvania to Lambert-St Louis.
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Price to beat on a one-way flight from Pennsylvania to Lambert-St Louis.
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Find flight deals from Pennsylvania to St. Louis

Cheapest flights from Pennsylvania to St. Louis
Explore the most affordable flight options available from Pennsylvania 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 Justfly.com 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/237:00 pmEWR - STL
1 stop15h 52mSpirit Airlines
Mon 7/2810:47 amSTL - EWR
1 stop8h 13mSpirit Airlines
Deal found 6/30$181
This Priceline deal was found by Cheapflights users on 6/29. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/175:59 amEWR - STL
1 stop8h 35mFrontier
Sun 7/202:36 pmSTL - EWR
1 stop9h 08mFrontier
Deal found 6/29$193
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 United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/59:30 pmEWR - STL
Nonstop3h 05mUnited Airlines
Tue 8/126:00 amSTL - EWR
Nonstop2h 35mUnited Airlines
Deal found 6/30$197
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.
Tue 8/198:00 amDCA - STL
Nonstop2h 10mSouthwest
Thu 8/219:50 amSTL - DCA
1 stop4h 05mSouthwest
Deal found 6/30$203
This Mytrip deal was found by Cheapflights users on 6/29. 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.
Thu 8/1410:15 amEWR - STL
2 stops9h 26mMultiple Airlines
Sun 8/172:30 pmSTL - EWR
1 stop5h 30mMultiple Airlines
Deal found 6/29$203
This FlightHub deal was found by Cheapflights users on 6/29. 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.
Thu 8/76:10 amIAD - STL
1 stop8h 24mFrontier
Sun 8/107:59 pmSTL - IAD
1 stop13h 08mFrontier
Deal found 6/29$204
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 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.
Thu 8/76:00 amIAD - STL
1 stop4h 41mDelta
Mon 8/119:17 amSTL - IAD
1 stop6h 13mDelta
Deal found 6/30$217
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.
Thu 8/76:00 amDCA - STL
1 stop4h 41mDelta
Mon 8/115:11 pmSTL - DCA
1 stop4h 35mDelta
Deal found 6/30$217
This Delta deal was found by Cheapflights users on 6/29. 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.
Wed 10/156:00 amEWR - STL
1 stop4h 35mDelta
Wed 10/227:20 amSTL - EWR
1 stop6h 04mDelta
Deal found 6/29$217

Cheapflights Fare Finder

Customize your flight search to find flights from Pennsylvania 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 Pennsylvania to St. Louis that are best for you.

Fly from

Pennsylvania

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

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Wed 7/23

7:00 pm-9:52 am

1 stop15h 52m

Lambert-St Louis

Mon 7/28

10:47 am-8:00 pm

1 stop8h 13m

$181

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Thu 7/17

5:59 am-1:34 pm

1 stop8h 35m

Lambert-St Louis

Sun 7/20

2:36 pm-12:44 am

1 stop9h 08m

$193

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

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Tue 8/5

9:30 pm-11:35 pm

Nonstop3h 05m

Lambert-St Louis

Tue 8/12

6:00 am-9:35 am

Nonstop2h 35m

$197

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Thu 8/14

10:15 am-6:41 pm

2 stops9h 26m

Lambert-St Louis

Sun 8/17

2:30 pm-9:00 pm

1 stop5h 30m

$203

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 8/19

8:00 am-9:10 am

Nonstop2h 10m

Lambert-St Louis

Thu 8/21

9:50 am-2:55 pm

1 stop4h 05m

$203

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 8/7

6:10 am-1:34 pm

1 stop8h 24m

Lambert-St Louis

Sun 8/10

7:59 pm-10:07 am

1 stop13h 08m

$204

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 8/7

6:00 am-9:41 am

1 stop4h 41m

Lambert-St Louis

Mon 8/11

9:17 am-4:30 pm

1 stop6h 13m

$217

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Thu 8/7

6:00 am-9:41 am

1 stop4h 41m

Lambert-St Louis

Mon 8/11

5:11 pm-10:46 pm

1 stop4h 35m

$217

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Showing 1-10 of 60 results
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Best time to book a flight from Pennsylvania to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Pennsylvania 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 Pennsylvania to St. Louis

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

Currently, August is the cheapest month in which you can book a flight from Pennsylvania to St. Louis (average of $311). Flying from Pennsylvania 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 PA to STL?

Find hourly flight availability from Pennsylvania 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.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Pennsylvania to St. Louis as you normally would.

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 through reviews of airlines operating flights from Pennsylvania to St. Louis, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.0

Overall

8.0

Entertainment

7.6

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
4,273 reviews
Southwest
8.0
Very good
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.0

Overall

8.0

Entertainment

7.6

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
7,973 reviews
Southwest
8.0
Very good
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.0

Overall

8.0

Entertainment

7.6

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
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.0

Overall

8.0

Entertainment

7.6

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
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.0

Overall

8.0

Entertainment

7.6

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
8,101 reviews
Southwest
8.0
Very good
4,273 reviews

Crew

8.6

Boarding

8.2

Food

7.0

Overall

8.0

Entertainment

7.6

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 Pennsylvania to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from Pennsylvania?

    Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to St. Louis from Pennsylvania.

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

    Flights from Pennsylvania to Lambert-St Louis have been viewed 32 times in the past calendar month.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $58. Users have also found prices from $63 and $91 on Spirit Airlines and American Airlines, respectively.

  • What are the most popular routes from Pennsylvania to St. Louis?

    While some choose either New York LaGuardia - Lambert-St Louis or New York John F Kennedy Intl - Lambert-St Louis, Newark - Lambert-St Louis is the most popular route from Pennsylvania to St. Louis.

  • What are the most reliable airlines from Pennsylvania to St. Louis?

    Consider Qatar Airways (81%), Iberia (76%) or British Airways (73%) when booking your flight. These represent the most reliable airlines when flying from Pennsylvania to St. Louis.

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

    The cheapest flight price from Pennsylvania to St. Louis is $125. On average you can expect to pay $317. The most popular route, (Newark - Lambert-St Louis), can usually be booked for $133.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Pennsylvania 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 Pennsylvania to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Pennsylvania to St. Louis (average of $311). Flying from Pennsylvania 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 Pennsylvania?

Book flights to Pennsylvania 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 Pennsylvania to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Newark to St. Louis flights
LaGuardia to St. Louis flights
Los Angeles to St. Louis flights
John F Kennedy Intl to St. Louis flights
Newark to Kansas City flights
John F Kennedy Intl to Kansas City flights
Seattle to St. Louis flights
Dulles Intl to St. Louis flights
Dallas/Fort Worth to St. Louis flights
Boston to St. Louis flights
Dulles Intl to Kansas City flights
Hobby to St. Louis flights
Denver to St. Louis flights
George Bush Intcntl to St. Louis flights
LaGuardia to Kansas City flights
Atlanta to St. Louis flights
Ontario to St. Louis flights
Denver to Kansas City flights
Baltimore to St. Louis flights
Miami to St. Louis flights
Los Angeles to Kansas City flights
Seattle to Kansas City flights
Boston to Kansas City flights
Sky Harbor Intl to Kansas City flights
O'Hare Intl to Kansas City flights
San Francisco to St. Louis flights
Denver to Springfield flights
Reagan-National to St. Louis flights
Dallas/Fort Worth to Kansas City flights
Philadelphia to St. Louis flights
O'Hare Intl to St. Louis flights
San Francisco to Kansas City flights
Sky Harbor Intl to St. Louis flights
Orlando to St. Louis flights
Atlanta to Kansas City flights
Raleigh to Kansas City flights
Philadelphia to Kansas City flights
Hobby to Kansas City flights
Portland to Kansas City flights
Baltimore to Kansas City flights
Minneapolis to St. Louis flights
Salt Lake City to Kansas City flights
Orlando to Kansas City flights
Reagan-National to Kansas City flights
Minneapolis to Kansas City flights
Raleigh to St. Louis flights
George Bush Intcntl to Kansas City flights
Detroit to Kansas City flights
Charlotte to St. Louis flights
Ontario to Kansas City flights

Top 5 airlines flying from Pennsylvania to St. Louis

Discover the top 5 airlines that operate flights from Pennsylvania 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
FrontierCheapest$48Average$144FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$171Average$354FlexibilityNo cancel feeOn-time71%
DeltaCheapest$200Average$345FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$236Average$460FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$245Average$380FlexibilityNo cancel feeOn-time63%

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