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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 12/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Nov 26 — Dec 31
Tue 11/26
Tue 12/3
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 November 21, 2024.

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 November 21, 2024.

This CheapOair deal was found by Cheapflights users on 11/20. 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.
Wed 12/45:02 pmSTL - PHL
1 stop17h 46mFrontier
Sat 12/710:59 pmPHL - STL
1 stop25h 25mFrontier
Deal found 11/20$118
This CheapOair deal was found by Cheapflights users on 11/21. 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 12/54:26 pmSTL - PHL
1 stop6h 40mMultiple Airlines
Sun 12/810:59 pmPHL - STL
1 stop25h 25mMultiple Airlines
Deal found 11/21$197
This CheapOair deal was found by Cheapflights users on 11/20. 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 12/55:02 pmSTL - IAD
1 stop24h 17mFrontier
Sun 12/85:57 pmIAD - STL
1 stop6h 27mFrontier
Deal found 11/20$218
This American Airlines deal was found by Cheapflights users on 11/20. 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 12/166:10 amSTL - DCA
Nonstop2h 08mAmerican Airlines
Mon 12/168:04 pmDCA - STL
Nonstop2h 49mAmerican Airlines
Deal found 11/20$229
This United Airlines deal was found by Cheapflights users on 11/19. 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.
Mon 12/238:25 amSTL - IAD
Nonstop2h 18mUnited Airlines
Sun 12/298:35 amIAD - STL
1 stop6h 49mUnited Airlines
Deal found 11/19$239
This Delta deal was found by Cheapflights users on 11/21. 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 12/206:29 amSTL - DCA
1 stop4h 30mDelta
Mon 12/305:42 pmDCA - STL
1 stop4h 53mDelta
Deal found 11/21$248
This FlightHub deal was found by Cheapflights users on 11/20. 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.
Sun 12/224:27 pmSTL - PIT
1 stop18h 02mMultiple Airlines
Sun 1/510:07 pmPIT - STL
1 stop11h 06mMultiple Airlines
Deal found 11/20$248
This Delta deal was found by Cheapflights users on 11/20. 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 12/147:15 amSTL - IAD
1 stop6h 21mDelta
Sat 1/47:15 amIAD - STL
1 stop5h 54mDelta
Deal found 11/20$248
This Southwest deal was found by Cheapflights users on 11/20. 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 12/317:45 pmSTL - LGA
Nonstop2h 20mSouthwest
Sat 1/186:00 amLGA - STL
2 stops11h 40mSouthwest
Deal found 11/20$249
This Mytrip deal was found by Cheapflights users on 11/19. 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 12/35:21 pmSTL - LGA
2 stops13h 10mSpirit Airlines
Tue 12/106:30 amLGA - STL
1 stop9h 51mSpirit Airlines
Deal found 11/19$257
This American Airlines deal was found by Cheapflights users on 11/20. 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.
Fri 12/65:05 amSTL - AVP
1 stop5h 17mAmerican Airlines
Sun 12/84:26 pmAVP - STL
1 stop6h 47mAmerican Airlines
Deal found 11/20$258
This American Airlines deal was found by Cheapflights users on 11/20. 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 12/46:40 amSTL - SCE
1 stop4h 01mAmerican Airlines
Sun 12/86:23 amSCE - STL
2 stops7h 51mAmerican Airlines
Deal found 11/20$263

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 2,629,791 searches. Data last updated November 21, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 12/4

5:02 pm-11:48 am

1 stop17h 46m

Philadelphia

Sat 12/7

10:59 pm-11:24 pm

1 stop25h 25m

$118

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 12/5

4:26 pm-12:06 am

1 stop6h 40m

Philadelphia

Sun 12/8

10:59 pm-11:24 pm

1 stop25h 25m

$197

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Thu 12/5

5:02 pm-6:19 pm

1 stop24h 17m

Washington, D.C. Dulles Intl

Sun 12/8

5:57 pm-11:24 pm

1 stop6h 27m

$218

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 12/16

6:10 am-9:18 am

Nonstop2h 08m

Washington, D.C. Reagan-National

Mon 12/16

8:04 pm-9:53 pm

Nonstop2h 49m

$229

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Thu 1/2

8:25 am-11:43 am

Nonstop2h 18m

Washington, D.C. Dulles Intl

Sat 1/4

6:50 pm-8:23 pm

Nonstop2h 33m

$229

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sun 2/9

1:05 pm-4:00 pm

Nonstop1h 55m

Washington, D.C. Reagan-National

Wed 2/12

5:10 pm-10:10 pm

1 stop6h 00m

$239

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 2/18

7:27 pm-9:50 am

1 stop13h 23m

Philadelphia

Sat 2/22

6:10 am-6:27 pm

1 stop13h 17m

$239

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 2/15

6:53 pm-4:59 pm

1 stop21h 06m

Washington, D.C. Reagan-National

Sun 2/23

1:03 pm-9:16 am

1 stop21h 13m

$242

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 2/6

5:30 pm-11:59 pm

1 stop5h 29m

Washington, D.C. Reagan-National

Fri 2/7

6:00 am-10:47 am

1 stop5h 47m

$244

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 3/4

10:20 am-4:00 pm

1 stop4h 40m

Washington, D.C. Reagan-National

Thu 3/13

6:00 am-11:20 am

1 stop6h 20m

$248

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/21

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 $284). 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 November 21, 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.

Weekly flight availability from St. Louis to Pennsylvania

Explore weekly flight availability from St. Louis to Pennsylvania. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated November 21, 2024.

The most flights from STL to USPA are scheduled on a Monday (10 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).

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 November 21, 2024.
Read through reviews of airlines operating flights from St. Louis to Pennsylvania, such as Alaska Airlines, Frontier and American Airlines. 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
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
5,015 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,458 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,758 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
9,172 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

WestJet
7.3
Good
2,810 reviews
Southwest
8.1
Very good
5,015 reviews

Boarding

8.2

Comfort

8.1

Entertainment

7.7

Food

7.2

Overall

8.1

Crew

8.7

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

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 Spirit Airlines and Delta, with prices starting from $106 and $109, 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: Republic Airways (95%), Aer Lingus (94%), PSA Airlines (91%).

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

    While on average a flight from St. Louis to Pennsylvania is generally $1,068, our data shows the cheapest flight currently is $194. When looking at the most popular route, (Lambert-St Louis - New York LaGuardia), you can expect to pay $181 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 $284). 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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Kansas City to Charlotte flights
St. Louis to New Orleans flights
Kansas City to Honolulu flights
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St. Louis to Reagan-National flights
Kansas City to Fort Lauderdale flights
Kansas City to Reagan-National flights
Kansas City to Ontario flights

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 2,629,791 searches. Data last updated November 21, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$99FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$130Average$466FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$131Average$388FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$324FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$273Average$408FlexibilityNo cancel feeOn-time63%
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