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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 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
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 February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$110
(Frontier)

One-way from

$55
(Frontier)

Popular in

February

Cheapest in

June

Average price

$446

Good round-trip deal

$314 or less

Good one-way deal

$171 or less
Provider with most accurate pricing for Lambert-St Louis-Philadelphia flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Philadelphia flights.
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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. 21% potential increase in price ($89 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in February 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 February 20, 2025.

This Frontier deal was found by Cheapflights users on 2/19. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/235:41 pmSTL - PHL
1 stop12h 51mFrontier
Sat 4/264:28 pmPHL - STL
1 stop8h 36mFrontier
Deal found 2/19$110
This Mytrip deal was found by Cheapflights users on 2/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/16:47 pmSTL - EWR
1 stop22h 38mSpirit Airlines
Thu 4/312:10 pmEWR - STL
1 stop6h 42mSpirit Airlines
Deal found 2/20$136
This CheapOair deal was found by Cheapflights users on 2/19. 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.
Sun 3/306:47 pmSTL - PHL
1 stop13h 11mMultiple Airlines
Tue 4/14:16 pmPHL - STL
1 stop8h 30mMultiple Airlines
Deal found 2/19$139
This Mytrip deal was found by Cheapflights users on 2/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/105:24 pmSTL - MDT
1 stop22h 16mFrontier
Thu 3/135:40 pmMDT - STL
1 stop7h 09mFrontier
Deal found 2/20$158
This Mytrip deal was found by Cheapflights users on 2/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/306:47 pmSTL - PHL
1 stop13h 11mSpirit Airlines
Mon 3/317:40 pmPHL - STL
1 stop23h 12mSpirit Airlines
Deal found 2/18$161
This Mytrip deal was found by Cheapflights users on 2/19. 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 4/16:47 pmSTL - PIT
1 stop28h 39mSpirit Airlines
Tue 4/157:10 amPIT - STL
1 stop11h 06mSpirit Airlines
Deal found 2/19$177
This United Airlines deal was found by Cheapflights users on 2/18. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/17:25 amSTL - EWR
Nonstop2h 38mUnited Airlines
Tue 4/82:00 pmEWR - STL
Nonstop2h 48mUnited Airlines
Deal found 2/18$177
This Southwest deal was found by Cheapflights users on 2/20. 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.
Thu 3/67:55 amSTL - LGA
1 stop5h 50mSouthwest
Mon 3/106:50 pmLGA - STL
Nonstop2h 55mSouthwest
Deal found 2/20$187
This Frontier deal was found by Cheapflights users on 2/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/711:00 amSTL - LGA
1 stop10h 00mFrontier
Tue 3/115:59 pmLGA - STL
1 stop6h 50mFrontier
Deal found 2/20$189
This Gotogate deal was found by Cheapflights users on 2/20. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/84:57 pmSTL - JFK
1 stop6h 46mFrontier
Wed 4/96:59 amJFK - STL
1 stop30h 17mFrontier
Deal found 2/20$190
This Mytrip deal was found by Cheapflights users on 2/19. 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 4/156:11 pmSTL - EWR
1 stop14h 48mMultiple Airlines
Wed 4/305:30 amEWR - STL
2 stops31h 15mMultiple Airlines
Deal found 2/19$194
This Mytrip deal was found by Cheapflights users on 2/19. 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 4/296:11 pmSTL - LGA
1 stop14h 49mMultiple Airlines
Wed 4/304:59 pmLGA - STL
2 stops28h 11mMultiple Airlines
Deal found 2/19$195

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 February 20, 2025.

Fly from

St. Louis

Fly to

Pennsylvania

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 4/23

5:41 pm-7:32 am

1 stop12h 51m

Philadelphia

Sat 4/26

4:28 pm-12:04 am

1 stop8h 36m

$110

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Tue 4/1

6:47 pm-9:54 pm

1 stop26h 07m

Newark

Tue 4/8

6:05 am-5:52 pm

1 stop12h 47m

$136

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sun 3/30

6:47 pm-8:58 am

1 stop13h 11m

Philadelphia

Tue 4/1

4:16 pm-11:46 pm

1 stop8h 30m

$139

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Mon 3/10

5:24 pm-4:40 pm

1 stop22h 16m

Harrisburg

Thu 3/13

5:40 pm-11:49 pm

1 stop7h 09m

$158

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sun 3/30

6:47 pm-8:58 am

1 stop13h 11m

Philadelphia

Mon 3/31

7:40 pm-5:52 pm

1 stop23h 12m

$161

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Tue 4/1

7:25 am-11:03 am

Nonstop2h 38m

Newark

Tue 4/8

2:00 pm-3:48 pm

Nonstop2h 48m

$177

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Tue 4/1

6:47 pm-12:26 am

1 stop28h 39m

Pittsburgh

Tue 4/15

7:10 am-5:16 pm

1 stop11h 06m

$177

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Thu 3/6

7:55 am-2:45 pm

1 stop5h 50m

New York LaGuardia

Mon 3/10

6:50 pm-8:45 pm

Nonstop2h 55m

$187

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Fri 3/7

11:00 am-10:00 pm

1 stop10h 00m

New York LaGuardia

Tue 3/11

5:59 pm-11:49 pm

1 stop6h 50m

$189

St. LouisNew York

STL - JFK

STLJFK

Lambert-St Louis

Tue 4/8

4:57 pm-12:43 am

1 stop6h 46m

New York John F Kennedy Intl

Wed 4/9

6:59 am-12:16 pm

1 stop30h 17m

$190

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

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 February 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.

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 February 20, 2025.
Read through reviews of airlines operating flights from St. Louis to Pennsylvania, such as Southwest, 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
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,692 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,220 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Qatar Airways
7.4
Good
3,609 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,766 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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, 37 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 United Airlines, with prices starting from $64 and $89, 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 (92%), Aer Lingus (88%), American Airlines (76%).

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

    While on average a flight from St. Louis to Pennsylvania is generally $1,542, our data shows the cheapest flight currently is $179. When looking at the most popular route, (Lambert-St Louis - Newark), you can expect to pay $136 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$91FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$130Average$445FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$131Average$389FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$349FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$276Average$398FlexibilityNo cancel feeOn-time63%
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