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

Within the past month, 19 users have taken a look at flights from Lambert-St Louis to Pennsylvania.

How long is the flight from St. Louis to Pennsylvania?

Frontier, Southwest, and American Airlines can get you from St. Louis to Pennsylvania in just under 3h 45m. Your travel time can differ by up to 3h 54m. St. Louis and Pennsylvania are separated by a distance of 552 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

In terms of precipitation, rainfall in Pennsylvania ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Pennsylvania when rainfall is around 2.7 in.

If weather is an important factor for your trip to Pennsylvania, 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 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

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 - Newark, Lambert-St Louis - New York LaGuardia and Lambert-St Louis - New York John F Kennedy Intl.

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

While on average a flight from St. Louis to Pennsylvania is generally $776, our data shows the cheapest flight currently is $176. When looking at the most popular route, (Lambert-St Louis - Newark), you can expect to pay $142 for that flight.

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: British Airways (94%), Qatar Airways (88%), American Airlines (86%).

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.

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.

$56+ Flights from St. Louis to Pennsylvania

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1. Tell us where you want to go

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Cheap 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 December 14, 2025.

Thu 12/2510:42 amSTL - EWR

1 stop9h 53mFrontier

Wed 12/3110:30 pmEWR - STL

1 stop12h 10mFrontier

Deal found 12/12

$188

Mon 12/159:54 amSTL - PHL

1 stop23h 06mFrontier

Thu 1/156:00 amPHL - STL

1 stop26h 54mFrontier

Deal found 12/11

$213

Thu 12/1810:42 amSTL - IAD

1 stop6h 34mFrontier

Thu 1/86:00 amIAD - STL

1 stop9h 48mFrontier

Deal found 12/13

$213

Tue 12/2310:48 amSTL - IAD

1 stop4h 49mFrontier

Thu 1/15:35 amIAD - STL

1 stop5h 05mFrontier

Deal found 12/12

$214

Sun 12/2110:57 amSTL - IAD

1 stop5h 01mFrontier

Thu 1/15:35 amIAD - STL

1 stop5h 05mFrontier

Deal found 12/12

$218

Thu 12/2510:42 amSTL - IAD

1 stop6h 34mFrontier

Sun 1/45:35 amIAD - STL

1 stop5h 05mFrontier

Deal found 12/12

$222

Mon 12/294:27 pmSTL - IAD

1 stop27h 36mFrontier

Mon 1/59:58 pmIAD - STL

1 stop25h 35mFrontier

Deal found 12/13

$226

Thu 12/251:10 pmSTL - DCA

Nonstop2h 00mSouthwest

Thu 1/112:25 pmDCA - STL

Nonstop2h 20mSouthwest

Deal found 12/13

$227

Thu 12/258:15 amSTL - IAD

Nonstop2h 09mUnited Airlines

Thu 1/18:35 amIAD - STL

Nonstop2h 33mUnited Airlines

Deal found 12/13

$227

Wed 12/314:27 pmSTL - PHL

1 stop7h 13mFrontier

Sun 1/45:01 amPHL - STL

1 stop28h 11mFrontier

Deal found 12/12

$233

Wed 12/244:27 pmSTL - PHL

1 stop7h 13mFrontier

Thu 1/110:00 pmPHL - STL

1 stop12h 45mFrontier

Deal found 12/12

$238

Tue 12/2310:48 amSTL - IAD

1 stop4h 49mFrontier

Tue 12/309:58 pmIAD - STL

1 stop25h 35mFrontier

Deal found 12/12

$242

Best flights from St. Louis to Pennsylvania
Discover carefully curated flight deals from St. Louis to Pennsylvania that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 14, 2025.

Fri 1/2311:18 amSTL - PHL

1 stop7h 39mFrontier

Mon 1/263:54 pmPHL - STL

1 stop8h 39mFrontier

Deal found 12/11

$145

Sun 1/255:42 pmSTL - PHL

1 stop27h 21mMultiple Airlines

Wed 1/2811:47 amPHL - STL

2 stops12h 46mMultiple Airlines

Deal found 12/12

$160

Tue 1/61:45 pmSTL - PIT

1 stop7h 10mSouthwest

Thu 1/86:00 pmPIT - STL

1 stop4h 00mSouthwest

Deal found 12/12

$164

Wed 1/711:05 amSTL - PIT

1 stop3h 45mAmerican Airlines

Tue 1/136:00 amPIT - STL

1 stop6h 41mAmerican Airlines

Deal found 12/13

$191

Thu 12/258:15 amSTL - IAD

Nonstop2h 09mUnited Airlines

Thu 1/18:35 amIAD - STL

Nonstop2h 33mUnited Airlines

Deal found 12/13

$227

Thu 12/256:00 amSTL - DCA

1 stop5h 57mDelta

Thu 1/16:00 amDCA - STL

1 stop4h 24mDelta

Deal found 12/13

$247

Tue 1/135:11 pmSTL - PHL

1 stop26h 26mFrontier

Wed 1/2111:47 amPHL - STL

2 stops12h 46mFrontier

Deal found 12/13

$152

Mon 1/125:11 pmSTL - PHL

1 stop19h 46mFrontier

Sun 1/187:12 pmPHL - STL

1 stop12h 39mFrontier

Deal found 12/11

$172

Thu 1/85:11 pmSTL - PIT

1 stop28h 56mMultiple Airlines

Mon 1/125:50 pmPIT - STL

2 stops38h 01mMultiple Airlines

Deal found 12/12

$191

Sat 1/178:55 amSTL - DCA

Nonstop1h 55mSouthwest

Sun 1/188:00 amDCA - STL

Nonstop2h 35mSouthwest

Deal found 12/12

$227

Wed 2/119:54 amSTL - DCA

Nonstop2h 05mAmerican Airlines

Sat 2/218:00 pmDCA - STL

Nonstop2h 42mAmerican Airlines

Deal found 12/11

$235

Wed 2/118:30 amSTL - IAD

Nonstop2h 10mUnited Airlines

Sat 2/218:40 amIAD - STL

Nonstop2h 33mUnited Airlines

Deal found 12/11

$235

Thu 1/85:11 pmSTL - PIT

1 stop22h 34mMultiple Airlines

Sun 1/1110:45 amPIT - STL

1 stop22h 20mMultiple Airlines

Deal found 12/14

$219

Sat 1/175:00 pmSTL - IAD

1 stop5h 37mDelta

Sun 1/186:00 amIAD - STL

1 stop4h 39mDelta

Deal found 12/12

$247

Thu 12/251:10 pmSTL - DCA

Nonstop2h 00mSouthwest

Thu 1/16:10 amDCA - STL

1 stop7h 50mSouthwest

Deal found 12/12

$237

Fri 2/279:38 pmSTL - PHL

1 stop12h 01mFrontier

Mon 3/29:12 amPHL - STL

1 stop12h 31mFrontier

Deal found 12/13

$218

Wed 1/72:54 pmSTL - DCA

1 stop6h 43mAmerican Airlines

Sat 1/107:40 amDCA - STL

Nonstop2h 44mAmerican Airlines

Deal found 12/13

$245

Thu 12/258:05 amSTL - DCA

1 stop5h 12mUnited Airlines

Thu 1/17:00 pmDCA - STL

1 stop4h 43mUnited Airlines

Deal found 12/12

$247

Tue 1/1312:00 pmSTL - IAD

1 stop4h 17mDelta

Sun 1/186:20 amIAD - STL

1 stop5h 45mDelta

Deal found 12/11

$251

Wed 2/1110:15 amSTL - DCA

2 stops6h 45mSouthwest

Sat 2/216:35 pmDCA - STL

Nonstop2h 30mSouthwest

Deal found 12/11

$250

Fri 2/279:38 pmSTL - PHL

1 stop12h 01mFrontier

Sun 3/810:38 pmPHL - STL

1 stop9h 29mFrontier

Deal found 12/14

$232

Thu 1/88:30 amSTL - PIT

1 stop4h 34mUnited Airlines

Mon 1/126:40 pmPIT - STL

1 stop6h 19mUnited Airlines

Deal found 12/11

$261

Sat 1/246:00 amSTL - EWR

1 stop5h 56mDelta

Sat 1/316:00 amEWR - STL

1 stop6h 54mDelta

Deal found 12/13

$261

Wed 4/1511:14 amSTL - EWR

1 stop4h 04mAmerican Airlines

Sat 4/188:24 amEWR - STL

1 stop4h 41mAmerican Airlines

Deal found 12/14

$261

Wed 2/112:35 pmSTL - IAD

1 stop6h 20mSouthwest

Sat 2/215:05 amIAD - STL

1 stop8h 25mSouthwest

Deal found 12/11

$255

Wed 12/314:27 pmSTL - PHL

1 stop7h 13mFrontier

Sun 1/45:01 amPHL - STL

1 stop28h 11mFrontier

Deal found 12/12

$233

Sat 1/34:27 pmSTL - PIT

1 stop29h 32mMultiple Airlines

Sun 1/1110:45 amPIT - STL

1 stop22h 20mMultiple Airlines

Deal found 12/13

$285

Tue 1/201:18 pmSTL - LGA

Nonstop2h 25mDelta

Sun 2/16:05 pmLGA - STL

Nonstop3h 01mDelta

Deal found 12/13

$267

Thu 1/157:00 amSTL - EWR

Nonstop2h 37mUnited Airlines

Sun 1/188:35 amEWR - STL

Nonstop3h 06mUnited Airlines

Deal found 12/12

$267

Fri 1/25:30 amSTL - MDT

1 stop6h 47mAmerican Airlines

Sun 1/47:30 amMDT - STL

1 stop7h 50mAmerican Airlines

Deal found 12/13

$269

Last-minute flights from St. Louis to Pennsylvania
Discover last-minute flight deals from St. Louis to Pennsylvania. Data last updated December 14, 2025 and is based on user searches.

Thu 1/83:43 pmSTL - EWR

1 stop6h 47mMultiple Airlines

Sun 1/115:59 amEWR - STL

1 stop9h 49mMultiple Airlines

Deal found 12/12

$149

Thu 1/83:43 pmSTL - EWR

1 stop8h 27mFrontier

Sun 1/115:59 amEWR - STL

1 stop9h 49mFrontier

Deal found 12/12

$151

Mon 1/125:11 pmSTL - PHL

1 stop23h 32mFrontier

Tue 1/206:20 pmPHL - STL

1 stop13h 31mFrontier

Deal found 12/13

$133

Mon 1/125:11 pmSTL - PHL

2 stops17h 03mMultiple Airlines

Tue 1/208:43 pmPHL - STL

1 stop27h 50mMultiple Airlines

Deal found 12/13

$152

Tue 1/135:11 pmSTL - PHL

1 stop20h 47mFrontier

Wed 1/218:00 amPHL - STL

1 stop16h 33mFrontier

Deal found 12/13

$131

Wed 1/148:32 pmSTL - EWR

1 stop10h 21mMultiple Airlines

Fri 1/1612:00 pmEWR - STL

2 stops19h 51mMultiple Airlines

Deal found 12/12

$150

Tue 1/205:42 pmSTL - EWR

1 stop16h 07mFrontier

Wed 1/2811:44 amEWR - STL

1 stop12h 49mFrontier

Deal found 12/13

$133

Tue 1/205:42 pmSTL - PHL

1 stop15h 55mMultiple Airlines

Mon 1/268:43 pmPHL - STL

2 stops35h 08mMultiple Airlines

Deal found 12/11

$139

Tue 1/205:42 pmSTL - PHL

1 stop15h 55mFrontier

Mon 1/268:35 pmPHL - STL

1 stop27h 58mFrontier

Deal found 12/11

$142

Fri 1/2311:18 amSTL - PHL

1 stop7h 39mFrontier

Mon 1/263:54 pmPHL - STL

1 stop8h 39mFrontier

Deal found 12/11

$145

Sun 1/255:42 pmSTL - EWR

1 stop15h 18mMultiple Airlines

Wed 1/2811:44 amEWR - STL

1 stop12h 49mMultiple Airlines

Deal found 12/13

$142

Mon 1/265:42 pmSTL - PHL

1 stop22h 36mFrontier

Mon 2/28:35 pmPHL - STL

1 stop27h 58mFrontier

Deal found 12/12

$132

One-way flights from St. Louis to Pennsylvania
Search for one-way flight options from St. Louis to Pennsylvania. Find affordable one-way fares based on user searches. Data last updated December 14, 2025.

Wed 1/148:32 pmSTL - EWR

1 stop10h 21mMultiple Airlines

Deal found 12/12

$56

Wed 2/118:17 pmSTL - EWR

1 stop27h 51mFrontier

Deal found 12/12

$57

Tue 1/275:42 pmSTL - PHL

1 stop15h 55mFrontier

Deal found 12/13

$63

Mon 1/261:40 pmSTL - DCA

1 stop7h 19mFrontier

Deal found 12/12

$64

Fri 1/2311:18 amSTL - PHL

1 stop7h 39mFrontier

Deal found 12/12

$64

Mon 1/198:32 pmSTL - EWR

1 stop25h 58mMultiple Airlines

Deal found 12/14

$64

Thu 1/83:43 pmSTL - EWR

1 stop8h 27mFrontier

Deal found 12/11

$65

Tue 1/135:11 pmSTL - PHL

1 stop20h 47mFrontier

Deal found 12/14

$67

Wed 2/48:22 pmSTL - EWR

1 stop10h 31mMultiple Airlines

Deal found 12/14

$67

Mon 1/125:11 pmSTL - PHL

1 stop23h 32mFrontier

Deal found 12/14

$68

Sat 2/288:17 pmSTL - EWR

1 stop10h 48mMultiple Airlines

Deal found 12/13

$68

Wed 1/148:32 pmSTL - PHL

1 stop13h 42mFrontier

Deal found 12/12

$69

Find flight deals from St. Louis to Pennsylvania

Most accurate provider	eDreams 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$131 (Kiwi.com)
One-way from	$56 (Kiwi.com)
Popular in	November
Cheapest in	August
Average price	$463
Good round-trip deal	$537 or less
Good one-way deal	$393 or less

Provider with most accurate pricing for Lambert-St Louis-Philadelphia flight deals.

Search Deals

Provider most trusted by Cheapflights users for Lambert-St Louis-Philadelphia flights.

Search Deals

From Lambert-St Louis to Pennsylvania

Search Deals

One-way flight from Lambert-St Louis to Pennsylvania

Search Deals

Highest demand for flights based on searches. 9% potential increase in price ($43 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in December 2025

Search Deals

Price to beat on a round-trip flight from Lambert-St Louis to Pennsylvania.

Search Deals

Price to beat on a one-way flight from Lambert-St Louis to Pennsylvania.

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Pennsylvania that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 1/23

11:18 am-7:57 pm

1 stop7h 39m

Philadelphia

Mon 1/26

3:54 pm-11:33 pm

1 stop8h 39m

$145

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 1/13

5:11 pm-8:37 pm

1 stop26h 26m

Philadelphia

Wed 1/21

11:47 am-11:33 pm

2 stops12h 46m

$152

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sun 1/25

5:42 pm-10:03 pm

1 stop27h 21m

Philadelphia

Wed 1/28

11:47 am-11:33 pm

2 stops12h 46m

$160

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Tue 1/6

1:45 pm-9:55 pm

1 stop7h 10m

Pittsburgh

Thu 1/8

6:00 pm-9:00 pm

1 stop4h 00m

$164

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 1/12

5:11 pm-1:57 pm

1 stop19h 46m

Philadelphia

Sun 1/18

7:12 pm-6:51 am

1 stop12h 39m

$172

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Wed 1/7

11:05 am-3:50 pm

1 stop3h 45m

Pittsburgh

Tue 1/13

6:00 am-11:41 am

1 stop6h 41m

$191

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Thu 1/8

5:11 pm-11:07 pm

1 stop28h 56m

Pittsburgh

Mon 1/12

5:50 pm-6:51 am

2 stops38h 01m

$191

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 2/27

9:38 pm-10:39 am

1 stop12h 01m

Philadelphia

Mon 3/2

9:12 am-8:43 pm

1 stop12h 31m

$218

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Thu 1/8

5:11 pm-4:45 pm

1 stop22h 34m

Pittsburgh

Sun 1/11

10:45 am-8:05 am

1 stop22h 20m

$219

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Thu 12/25

8:15 am-11:24 am

Nonstop2h 09m

Washington, D.C. Dulles Intl

Thu 1/1

8:35 am-10:08 am

Nonstop2h 33m

$227

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Showing 1-10 of 60 results

...

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 $152). Flying from St. Louis to Pennsylvania in June is currently the most expensive (average of $244). 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?

It’s optimal to fly from St. Louis to Pennsylvania in the morning. By choosing this option you can save up to 18% on the cost of your flight, compared to a flight at noon.

What is the cheapest day to fly from St. Louis to Pennsylvania?

Travelers seeking maximum savings on their St. Louis to Pennsylvania flight should consider departing on Thursday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from St. Louis to Pennsylvania

The most flights from STL to USPA are scheduled on a Friday (10 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (3 on average).

Reviews of airlines servicing Pennsylvania

Get a feel of what it's like to fly with Southwest, Delta, and United Airlines 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.

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Southwest

7.9

Good

4,250 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Delta

7.9

Good

8,008 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

United Airlines

7.4

Good

9,092 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

American Airlines

7.2

Good

11,052 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Frontier

5.8

Fair

3,080 reviews

Southwest

7.9

Good

4,250 reviews

Reviews

1 / 20

2.0

Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

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, 19 users have taken a look at flights from Lambert-St Louis to Pennsylvania.
How long is the flight from St. Louis to Pennsylvania?
Frontier, Southwest, and American Airlines can get you from St. Louis to Pennsylvania in just under 3h 45m. Your travel time can differ by up to 3h 54m. St. Louis and Pennsylvania are separated by a distance of 552 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.
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 - Newark, Lambert-St Louis - New York LaGuardia 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: British Airways (94%), Qatar Airways (88%), American Airlines (86%).
What are the cheapest flights from St. Louis to Pennsylvania?
While on average a flight from St. Louis to Pennsylvania is generally $776, our data shows the cheapest flight currently is $176. When looking at the most popular route, (Lambert-St Louis - Newark), you can expect to pay $142 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 $152). Flying from St. Louis to Pennsylvania in June is currently the most expensive (average of $244). 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

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from St. Louis to Pennsylvania

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$130	Average$232	FlexibilityNo cancel fee	On-time62%
Spirit Airlines	Cheapest$132	Average$219	FlexibilityNo cancel fee	On-time65%
Delta	Cheapest$172	Average$391	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$226	Average$392	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$241	Average$393	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$248	Average$349	FlexibilityNo cancel fee	On-time69%

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$56+ 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 1/14. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheapest flights from St. Louis to PennsylvaniaExplore 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 December 14, 2025.

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 December 14, 2025.

Find 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 December 14, 2025.

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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 December 14, 2025.

What is the cheapest day to fly from St. Louis to Pennsylvania?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Pennsylvania. Price data was last updated on December 16, 2024.

Weekly flight availability from St. Louis to Pennsylvania

Reviews of airlines servicing Pennsylvania

Get a feel of what it's like to fly with Southwest, Delta, and United Airlines 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.

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.

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Top 6 airlines flying from St. Louis to Pennsylvania

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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 December 14, 2025.