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$55+ 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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Jan 25 — Feb 11
Sat 1/25
Sat 2/1
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 January 20, 2025.

Round-trip from

$120
(Gotogate)

One-way from

$55
(Frontier)
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 January 20, 2025.

This Gotogate deal was found by Cheapflights users on 1/19. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/15:20 pmSTL - PHL
1 stop13h 10mFrontier
Mon 3/1010:59 pmPHL - STL
1 stop25h 50mFrontier
Deal found 1/19$120
This CheapOair deal was found by Cheapflights users on 1/19. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/55:05 pmSTL - PHL
1 stop20h 01mMultiple Airlines
Wed 2/198:59 pmPHL - STL
1 stop18h 43mMultiple Airlines
Deal found 1/19$157
This CheapOair deal was found by Cheapflights users on 1/20. 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.
Tue 3/44:00 pmSTL - PIT
1 stop24h 09mSpirit Airlines
Tue 3/116:45 amPIT - STL
1 stop10h 57mSpirit Airlines
Deal found 1/20$160
This Cheapflightsfares deal was found by Cheapflights users on 1/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/254:00 pmSTL - EWR
1 stop7h 12mSpirit Airlines
Thu 2/276:25 amEWR - STL
1 stop9h 17mSpirit Airlines
Deal found 1/19$178
This Mytrip deal was found by Cheapflights users on 1/19. 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.
Fri 3/75:15 pmSTL - EWR
2 stops26h 24mMultiple Airlines
Tue 3/115:45 amEWR - STL
1 stop11h 57mMultiple Airlines
Deal found 1/19$199
This Booking.com deal was found by Cheapflights users on 1/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/177:27 pmSTL - LGA
1 stop12h 33mMultiple Airlines
Wed 5/2110:50 pmLGA - STL
1 stop10h 35mMultiple Airlines
Deal found 1/20$209
This CheapOair deal was found by Cheapflights users on 1/20. 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.
Sun 2/25:05 pmSTL - LGA
1 stop15h 55mFrontier
Fri 2/75:00 pmLGA - STL
1 stop7h 31mFrontier
Deal found 1/20$210
This Booking.com deal was found by Cheapflights users on 1/19. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/2811:08 pmSTL - JFK
1 stop30h 22mFrontier
Sun 3/21:02 pmJFK - STL
1 stop11h 41mFrontier
Deal found 1/19$210
This Delta deal was found by Cheapflights users on 1/18. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/510:20 amSTL - LGA
Nonstop2h 19mDelta
Wed 3/126:59 pmLGA - STL
Nonstop2h 53mDelta
Deal found 1/18$221
This American Airlines deal was found by Cheapflights users on 1/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/189:29 amSTL - ABE
1 stop6h 36mAmerican Airlines
Tue 2/2512:43 pmABE - STL
1 stop7h 50mAmerican Airlines
Deal found 1/19$224
This Cheapflightsfares deal was found by Cheapflights users on 1/20. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/157:27 pmSTL - PHL
1 stop13h 23mSpirit Airlines
Sun 5/186:10 amPHL - STL
1 stop13h 17mSpirit Airlines
Deal found 1/20$227
This American Airlines deal was found by Cheapflights users on 1/20. 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 2/146:16 pmSTL - DCA
Nonstop2h 14mAmerican Airlines
Mon 2/179:14 pmDCA - STL
Nonstop2h 30mAmerican Airlines
Deal found 1/20$229

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 January 20, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 3/1

5:20 pm-7:30 am

1 stop13h 10m

Philadelphia

Mon 3/10

10:59 pm-11:49 pm

1 stop25h 50m

$120

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 2/5

5:05 pm-2:06 pm

1 stop20h 01m

Philadelphia

Wed 2/19

8:59 pm-2:42 pm

1 stop18h 43m

$157

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Tue 3/4

4:00 pm-5:09 pm

1 stop24h 09m

Pittsburgh

Tue 3/11

6:45 am-4:42 pm

1 stop10h 57m

$160

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Tue 2/25

4:00 pm-12:12 am

1 stop7h 12m

Newark

Thu 2/27

6:25 am-2:42 pm

1 stop9h 17m

$178

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Fri 3/7

5:15 pm-8:39 pm

2 stops26h 24m

Newark

Tue 3/11

5:45 am-4:42 pm

1 stop11h 57m

$199

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Sat 5/17

7:27 pm-9:00 am

1 stop12h 33m

New York LaGuardia

Wed 5/21

10:50 pm-8:25 am

1 stop10h 35m

$209

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Sun 2/2

5:05 pm-10:00 am

1 stop15h 55m

New York LaGuardia

Fri 2/7

5:00 pm-11:31 pm

1 stop7h 31m

$210

St. LouisNew York

STL - JFK

STLJFK

Lambert-St Louis

Fri 2/28

11:08 pm-6:30 am

1 stop30h 22m

New York John F Kennedy Intl

Sun 3/2

1:02 pm-11:43 pm

1 stop11h 41m

$210

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Mon 3/17

6:20 am-9:40 am

Nonstop2h 20m

New York LaGuardia

Tue 3/18

10:15 am-12:15 pm

Nonstop3h 00m

$219

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Wed 3/5

10:20 am-1:39 pm

Nonstop2h 19m

New York LaGuardia

Wed 3/12

6:59 pm-8:52 pm

Nonstop2h 53m

$221

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

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, 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 January 20, 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.

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 January 20, 2025.

The most flights from STL to USPA are scheduled on a Monday (7 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (3 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 January 20, 2025.
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
4,659 reviews

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

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
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

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
9,696 reviews
Southwest
8.1
Very good
4,659 reviews

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

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
8,521 reviews
Southwest
8.1
Very good
4,659 reviews

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

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
8,982 reviews
Southwest
8.1
Very good
4,659 reviews

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

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
4,659 reviews

Overall

8.1

Entertainment

7.7

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

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?

    $55 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 Southwest, with prices starting from $62 and $111, 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: Southwest (86%), Aer Lingus (86%), Republic Airways (75%).

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

    While on average a flight from St. Louis to Pennsylvania is generally $1,238, our data shows the cheapest flight currently is $169. When looking at the most popular route, (Lambert-St Louis - New York LaGuardia), you can expect to pay $186 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.

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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 January 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$92FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$130Average$458FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$131Average$392FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$345FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$279Average$402FlexibilityNo cancel feeOn-time63%
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