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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 2/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
1 adult, Economy
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Cheap flight deals from St. Louis to Pennsylvania

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Pennsylvania (USPA). 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 December 18, 2024.

Round-trip from

$118
(FlightHub)

One-way from

$54
(Cheapflightsfares)
From Lambert-St Louis to Pennsylvania
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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 December 18, 2024.

This Southwest deal was found by Cheapflights users on 12/18. 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 12/247:45 pmSTL - LGA
Nonstop2h 20mSouthwest
Tue 12/317:20 amLGA - STL
Nonstop2h 55mSouthwest
Deal found 12/18$262
This American Airlines deal was found by Cheapflights users on 12/18. 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 12/245:03 amSTL - LGA
1 stop5h 22mAmerican Airlines
Tue 12/316:10 amLGA - STL
1 stop7h 40mAmerican Airlines
Deal found 12/18$271
This CheapOair deal was found by Cheapflights users on 12/18. 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 12/193:53 pmSTL - PHL
1 stop28h 46mFrontier
Mon 1/67:30 amPHL - STL
1 stop13h 59mFrontier
Deal found 12/18$278
This Priceline deal was found by Cheapflights users on 12/16. 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.
Tue 12/314:27 pmSTL - PHL
1 stop6h 38mMultiple Airlines
Thu 1/211:52 amPHL - STL
1 stop8h 28mMultiple Airlines
Deal found 12/16$297
This American Airlines deal was found by Cheapflights users on 12/17. 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 12/316:15 amSTL - DCA
Nonstop2h 04mAmerican Airlines
Thu 1/98:37 amDCA - STL
Nonstop2h 47mAmerican Airlines
Deal found 12/17$299
This Delta deal was found by Cheapflights users on 12/17. 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 12/315:55 pmSTL - IAD
1 stop4h 07mDelta
Thu 1/912:31 pmIAD - STL
1 stop5h 11mDelta
Deal found 12/17$318
This American Airlines deal was found by Cheapflights users on 12/17. 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.
Mon 12/235:58 pmSTL - MDT
1 stop4h 57mAmerican Airlines
Fri 12/276:27 pmMDT - STL
1 stop4h 52mAmerican Airlines
Deal found 12/17$323
This Delta deal was found by Cheapflights users on 12/17. 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 12/186:00 amSTL - ABE
1 stop4h 45mDelta
Sat 12/215:36 pmABE - STL
1 stop5h 23mDelta
Deal found 12/17$338
This American Airlines deal was found by Cheapflights users on 12/17. 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 12/245:03 amSTL - EWR
1 stop6h 49mAmerican Airlines
Tue 12/315:41 pmEWR - STL
1 stop5h 12mAmerican Airlines
Deal found 12/17$341
This Booking.com deal was found by Cheapflights users on 12/17. 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.
Wed 12/256:49 pmSTL - DCA
1 stop16h 19mFrontier
Wed 1/16:00 pmDCA - STL
1 stop28h 19mFrontier
Deal found 12/17$348
This Delta deal was found by Cheapflights users on 12/17. 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.
Sat 12/215:55 pmSTL - LGA
1 stop4h 19mDelta
Tue 1/76:55 amLGA - STL
Nonstop3h 03mDelta
Deal found 12/17$349
This American Airlines deal was found by Cheapflights users on 12/17. 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 12/2412:41 pmSTL - PHL
Nonstop2h 10mAmerican Airlines
Wed 1/111:13 amPHL - STL
Nonstop2h 37mAmerican Airlines
Deal found 12/17$357

Find flights from St. Louis to Pennsylvania within your budget

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 1/25

5:05 pm-7:59 am

1 stop13h 54m

Philadelphia

Mon 1/27

10:18 pm-11:31 pm

1 stop26h 13m

$118

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Thu 1/9

5:05 pm-8:28 am

1 stop14h 23m

Harrisburg

Fri 1/17

9:32 am-11:31 pm

1 stop14h 59m

$148

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sun 1/26

4:28 pm-6:55 pm

1 stop25h 27m

Philadelphia

Tue 1/28

7:20 am-11:31 pm

1 stop17h 11m

$201

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 1/7

4:27 pm-9:42 am

1 stop16h 15m

Philadelphia

Wed 1/8

4:31 pm-2:43 pm

1 stop23h 12m

$215

St. LouisNew York

STL - JFK

STLJFK

Lambert-St Louis

Sat 1/25

9:20 am-2:59 pm

1 stop4h 39m

New York John F Kennedy Intl

Mon 1/27

2:54 pm-7:23 pm

1 stop5h 29m

$222

St. LouisNew York

STL - JFK

STLJFK

Lambert-St Louis

Fri 2/14

5:20 pm-12:02 pm

1 stop17h 42m

New York John F Kennedy Intl

Wed 2/19

7:59 am-5:43 pm

1 stop10h 44m

$224

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 1/28

1:05 pm-4:00 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Tue 1/28

6:50 pm-8:15 pm

Nonstop2h 25m

$225

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Tue 1/14

12:15 pm-8:10 pm

2 stops30h 55m

New York LaGuardia

Tue 1/21

6:00 am-2:43 pm

1 stop9h 43m

$225

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Sat 1/11

1:02 pm-4:29 pm

Nonstop2h 27m

New York LaGuardia

Sun 1/12

9:30 am-11:32 am

Nonstop3h 02m

$227

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 3/3

6:04 am-9:19 am

Nonstop2h 15m

Washington, D.C. Reagan-National

Mon 3/10

8:58 pm-10:22 pm

Nonstop2h 24m

$228

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/18

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.

Travel insights for flights from St. Louis to Pennsylvania

Get recent, data-driven insights about flights from St. Louis to Pennsylvania including ideal travel times, pricing trends, and more.

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

Currently, September is the cheapest month in which you can book a flight from St. Louis to Pennsylvania (average of $234). Flying from St. Louis to Pennsylvania in March is currently the most expensive (average of $283). 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 December 18, 2024.

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.

Rainfall in Pennsylvania by month

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

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.

Temperature in Pennsylvania by month

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

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).

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 December 18, 2024.
Read through reviews of airlines operating flights from St. Louis to Pennsylvania, such as American Airlines, Alaska Airlines and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,554 reviews
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
9,055 reviews
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,848 reviews

Food

7.2

Crew

8.7

Overall

8.1

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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, 36 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 Frontier. You may also be able to find cheap deals on American Airlines and Delta, with prices starting from $84 and $88, 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 - 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: Republic Airways (100%), Aer Lingus (95%), Southwest (94%).

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

    While on average a flight from St. Louis to Pennsylvania is generally $949, our data shows the cheapest flight currently is $178. When looking at the most popular route, (Lambert-St Louis - Newark), you can expect to pay $176 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, September is the cheapest month in which you can book a flight from St. Louis to Pennsylvania (average of $234). Flying from St. Louis to Pennsylvania in March is currently the most expensive (average of $283). 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.

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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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$92FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$130Average$444FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$131Average$394FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$342FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$278Average$404FlexibilityNo cancel feeOn-time63%
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