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$54+ Cheap flights from St. Louis (STL) to Pennsylvania

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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Aug 4 — Aug 111
Mon 8/4
Mon 8/11
1 adult, Economy
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Cheap flight deals from St. Louis to Pennsylvania

Keep the following information in mind while searching for St. Louis to Pennsylvania flight deals. Data was last updated July 30, 2025.

Round-trip from

$127
(CheapOair)

One-way from

$54
(Booking.com)

Popular in

March

Cheapest in

August

Average price

$296

Good round-trip deal

$296 or less

Good one-way deal

$229 or less
From Lambert-St Louis to Pennsylvania
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One-way flight from Lambert-St Louis to Pennsylvania
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Highest demand for flights based on searches. 12% potential increase in price ($50 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($8 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 Lambert-St Louis to Pennsylvania.
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Price to beat on a one-way flight from Lambert-St Louis to Pennsylvania.
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Find flight deals from St. Louis to Pennsylvania

Cheapest flights from St. Louis to Pennsylvania
Explore the most affordable flight options available from St. Louis to Pennsylvania. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 30, 2025.

This CheapOair deal was found by Cheapflights users on 7/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/212:30 pmSTL - PHL
1 stop5h 19mSpirit Airlines
Thu 8/287:00 amPHL - STL
1 stop7h 32mSpirit Airlines
Deal found 7/28$127
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/266:06 amSTL - PIT
1 stop10h 59mAmerican Airlines
Tue 9/28:20 amPIT - STL
1 stop8h 29mAmerican Airlines
Deal found 7/29$171
This CheapOair deal was found by Cheapflights users on 7/28. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/182:30 pmSTL - PHL
1 stop5h 19mMultiple Airlines
Wed 8/208:02 pmPHL - STL
1 stop18h 05mMultiple Airlines
Deal found 7/28$178
This Mytrip deal was found by Cheapflights users on 7/30. 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.
Thu 8/142:30 pmSTL - EWR
1 stop5h 30mSpirit Airlines
Mon 8/1810:00 amEWR - STL
1 stop4h 32mSpirit Airlines
Deal found 7/30$182
This FlightHub deal was found by Cheapflights users on 7/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2512:05 pmSTL - LGA
1 stop9h 33mSpirit Airlines
Sun 9/286:30 amLGA - STL
1 stop5h 20mSpirit Airlines
Deal found 7/30$184
This Gotogate deal was found by Cheapflights users on 7/28. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1112:05 pmSTL - EWR
1 stop7h 56mMultiple Airlines
Sun 9/145:55 amEWR - STL
1 stop10h 09mMultiple Airlines
Deal found 7/28$185
This Delta deal was found by Cheapflights users on 7/28. 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.
Mon 9/812:29 pmSTL - LGA
Nonstop2h 30mDelta
Tue 9/910:00 amLGA - STL
Nonstop2h 49mDelta
Deal found 7/28$196
This Delta deal was found by Cheapflights users on 7/28. 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.
Mon 9/84:20 pmSTL - JFK
Nonstop2h 40mDelta
Tue 9/92:59 pmJFK - STL
Nonstop2h 50mDelta
Deal found 7/28$196
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Sat 11/17:00 amSTL - EWR
Nonstop2h 29mUnited Airlines
Tue 11/49:46 pmEWR - STL
Nonstop2h 58mUnited Airlines
Deal found 7/28$197
This Frontier deal was found by Cheapflights users on 7/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/162:52 pmSTL - IAD
1 stop7h 34mFrontier
Sat 8/236:10 amIAD - STL
1 stop8h 23mFrontier
Deal found 7/28$198
This FlightHub deal was found by Cheapflights users on 7/30. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/135:40 pmSTL - MDT
1 stop15h 28mFrontier
Sat 8/1611:23 amMDT - STL
1 stop13h 24mFrontier
Deal found 7/30$205
This Frontier deal was found by Cheapflights users on 7/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/22:52 pmSTL - EWR
1 stop8h 52mFrontier
Thu 8/75:59 amEWR - STL
1 stop8h 35mFrontier
Deal found 7/28$208

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Pennsylvania 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 30, 2025.
Use the filters below to find and compare flights from St. Louis to Pennsylvania that are best for you.

Fly from

St. Louis

Fly to

Pennsylvania

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 8/21

2:30 pm-8:49 pm

1 stop5h 19m

Philadelphia

Thu 8/28

7:00 am-1:32 pm

1 stop7h 32m

$127

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Tue 8/26

6:06 am-6:05 pm

1 stop10h 59m

Pittsburgh

Tue 9/2

8:20 am-3:49 pm

1 stop8h 29m

$171

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 8/18

2:30 pm-8:49 pm

1 stop5h 19m

Philadelphia

Wed 8/20

8:02 pm-1:07 pm

1 stop18h 05m

$178

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Thu 8/14

2:30 pm-9:00 pm

1 stop5h 30m

Newark

Mon 8/18

10:00 am-1:32 pm

1 stop4h 32m

$182

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Thu 9/25

12:05 pm-10:38 pm

1 stop9h 33m

New York LaGuardia

Sun 9/28

6:30 am-10:50 am

1 stop5h 20m

$184

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Thu 9/11

12:05 pm-9:01 pm

1 stop7h 56m

Newark

Sun 9/14

5:55 am-3:04 pm

1 stop10h 09m

$185

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Mon 9/8

12:29 pm-3:59 pm

Nonstop2h 30m

New York LaGuardia

Tue 9/9

10:00 am-11:49 am

Nonstop2h 49m

$196

St. LouisNew York

STL - JFK

STLJFK

Lambert-St Louis

Mon 9/8

4:20 pm-8:00 pm

Nonstop2h 40m

New York John F Kennedy Intl

Tue 9/9

2:59 pm-4:49 pm

Nonstop2h 50m

$196

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Sat 11/1

7:00 am-10:29 am

Nonstop2h 29m

Newark

Tue 11/4

9:46 pm-11:44 pm

Nonstop2h 58m

$197

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 8/16

2:52 pm-11:26 pm

1 stop7h 34m

Washington, D.C. Dulles Intl

Sat 8/23

6:10 am-1:33 pm

1 stop8h 23m

$198

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/30

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

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

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

Currently, August is the cheapest month in which you can book a flight from St. Louis to Pennsylvania (average of $236). Flying from St. Louis to Pennsylvania in March is currently the most expensive (average of $295). 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 STL to PA?

Find hourly flight availability from St. Louis to Pennsylvania. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 30, 2025.

When flying from St. Louis to Pennsylvania, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Pennsylvania

Get insights into the airlines that provide service to Pennsylvania. 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 Pennsylvania. Reviews last updated July 30, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from St. Louis to Pennsylvania by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Southwest
8.0
Very good
4,241 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
United Airlines
7.4
Good
8,896 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

Jonathan,Jul 2025

SEA - BOS

Fantastic Check-in with easy baggage drop. While it took a while to find out which was the gate, the boarding was a dream, the stewards were simply incredible and the flight fantastic.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Pennsylvania. 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 from for flights from St. Louis to Pennsylvania?

    If you book a flight to Pennsylvania from St. Louis, you will be flying from Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis.

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

    Within the past month, 13 users have taken a look at flights from Lambert-St Louis to Pennsylvania.

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

    $54 is the cheapest one-way deal found within the past few days, from Spirit Airlines. You may also be able to find cheap deals on American Airlines and Delta, with prices starting from $90 and $99, respectively.

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

    The most popular flight routes from St. Louis to Pennsylvania are Lambert-St Louis - New York LaGuardia, Lambert-St Louis - Newark and Lambert-St Louis - New York John F Kennedy Intl.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from St. Louis to Pennsylvania on time: PSA Airlines (100%), Southwest (83%), Qatar Airways (80%).

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

    While on average a flight from St. Louis to Pennsylvania is generally $1,564, our data shows the cheapest flight currently is $151. When looking at the most popular route, (Lambert-St Louis - New York LaGuardia), you can expect to pay $131 for that flight.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from St. Louis to Pennsylvania (average of $236). Flying from St. Louis to Pennsylvania in March is currently the most expensive (average of $295). 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

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Alternative routes for St. Louis to Pennsylvania

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from St. Louis to Pennsylvania

Discover the top 5 airlines that operate flights from St. Louis to Pennsylvania. 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 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$63Average$206FlexibilityNo cancel feeOn-time62%
DeltaCheapest$196Average$388FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$198Average$383FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$223Average$450FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$270Average$391FlexibilityNo cancel feeOn-time63%

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