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$89+ 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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Apr 20 — Apr 271
Sun 4/20
Sun 4/27
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 April 15, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$183
(Booking.com)

One-way from

$89
(Frontier)

Popular in

March

Cheapest in

June

Average price

$418

Good round-trip deal

$326 or less

Good one-way deal

$153 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
Search Deals
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 ($10 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 15, 2025.

This Booking.com deal was found by Cheapflights users on 4/13. 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 5/1010:10 amSTL - LGA
1 stop12h 14mSpirit Airlines
Wed 5/216:00 amLGA - STL
1 stop28h 15mSpirit Airlines
Deal found 4/13$183
This American Airlines deal was found by Cheapflights users on 4/14. 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 5/146:00 amSTL - PIT
1 stop8h 45mAmerican Airlines
Wed 5/215:25 amPIT - STL
1 stop8h 42mAmerican Airlines
Deal found 4/14$183
This Mytrip deal was found by Cheapflights users on 4/15. 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.
Wed 5/145:45 pmSTL - JFK
1 stop15h 40mFrontier
Sat 5/176:59 amJFK - STL
1 stop18h 07mFrontier
Deal found 4/15$184
This Booking.com deal was found by Cheapflights users on 4/14. 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.
Thu 5/810:10 amSTL - LGA
1 stop12h 14mMultiple Airlines
Tue 5/1310:00 pmLGA - STL
1 stop27h 06mMultiple Airlines
Deal found 4/14$186
This Booking.com deal was found by Cheapflights users on 4/14. 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 5/165:55 pmSTL - LGA
1 stop26h 04mFrontier
Tue 5/2010:00 pmLGA - STL
1 stop26h 44mFrontier
Deal found 4/14$198
This Booking.com deal was found by Cheapflights users on 4/13. 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.
Thu 5/14:07 pmSTL - DCA
1 stop19h 00mFrontier
Sun 5/47:00 amDCA - STL
1 stop27h 09mFrontier
Deal found 4/13$208
This American Airlines deal was found by Cheapflights users on 4/14. 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.
Sat 5/243:47 pmSTL - DCA
Nonstop1h 58mAmerican Airlines
Sun 5/251:54 pmDCA - STL
Nonstop2h 17mAmerican Airlines
Deal found 4/14$213
This Southwest deal was found by Cheapflights users on 4/14. 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.
Wed 5/213:35 pmSTL - DCA
Nonstop2h 00mSouthwest
Sat 5/242:25 pmDCA - STL
1 stop6h 35mSouthwest
Deal found 4/14$214
This United Airlines deal was found by Cheapflights users on 4/14. 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.
Sat 5/245:33 pmSTL - IAD
1 stop5h 57mUnited Airlines
Sun 5/255:10 pmIAD - STL
1 stop6h 37mUnited Airlines
Deal found 4/14$214
This Delta deal was found by Cheapflights users on 4/13. 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.
Thu 5/297:06 pmSTL - IAD
1 stop4h 22mDelta
Sat 5/316:00 amIAD - STL
1 stop6h 54mDelta
Deal found 4/13$217
This Booking.com deal was found by Cheapflights users on 4/14. 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.
Thu 4/245:41 pmSTL - IAD
1 stop21h 54mFrontier
Sat 4/265:35 pmIAD - STL
1 stop7h 29mFrontier
Deal found 4/14$218
This Delta deal was found by Cheapflights users on 4/14. 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 5/146:00 amSTL - LGA
Nonstop2h 28mDelta
Wed 5/146:59 pmLGA - STL
Nonstop2h 49mDelta
Deal found 4/14$221

Cheapflights Fare Finder

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 April 15, 2025.
Use the filters below to find and compare flights from St. Louis to Pennsylvania that are best for you.

Fly from

St. Louis

Fly to

Pennsylvania

Route

Depart

Return

Price

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Sat 5/10

10:10 am-11:24 pm

1 stop12h 14m

New York LaGuardia

Wed 5/21

6:00 am-9:15 am

1 stop28h 15m

$183

St. LouisPittsburgh

STL - PIT

STLPIT

Lambert-St Louis

Wed 5/14

6:00 am-3:45 pm

1 stop8h 45m

Pittsburgh

Wed 5/21

5:25 am-1:07 pm

1 stop8h 42m

$183

St. LouisNew York

STL - JFK

STLJFK

Lambert-St Louis

Wed 5/14

5:45 pm-10:25 am

1 stop15h 40m

New York John F Kennedy Intl

Sat 5/17

6:59 am-12:06 am

1 stop18h 07m

$184

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Thu 5/8

10:10 am-11:24 pm

1 stop12h 14m

New York LaGuardia

Tue 5/13

10:00 pm-12:06 am

1 stop27h 06m

$186

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Fri 5/16

5:55 pm-8:59 pm

1 stop26h 04m

New York LaGuardia

Tue 5/20

10:00 pm-11:44 pm

1 stop26h 44m

$198

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 5/1

4:07 pm-12:07 pm

1 stop19h 00m

Washington, D.C. Reagan-National

Sun 5/4

7:00 am-9:09 am

1 stop27h 09m

$208

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Sat 5/24

3:47 pm-6:45 pm

Nonstop1h 58m

Washington, D.C. Reagan-National

Sun 5/25

1:54 pm-3:11 pm

Nonstop2h 17m

$213

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Wed 5/21

3:35 pm-6:35 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

Sat 5/24

2:25 pm-8:00 pm

1 stop6h 35m

$214

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Sat 5/24

5:33 pm-12:30 am

1 stop5h 57m

Washington, D.C. Dulles Intl

Sun 5/25

5:10 pm-10:47 pm

1 stop6h 37m

$214

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Thu 5/29

7:06 pm-12:28 am

1 stop4h 22m

Washington, D.C. Dulles Intl

Sat 5/31

6:00 am-11:54 am

1 stop6h 54m

$217

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/14

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.

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 $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 April 15, 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 April 15, 2025.

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 (8 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 April 15, 2025.
Read through reviews of airlines operating flights from St. Louis to Pennsylvania, such as Alaska Airlines, Southwest and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,876 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Southwest
8.0
Very good
4,279 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,917 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,658 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Overall

8.0

Comfort

7.9

Crew

8.5

Food

7.1

Entertainment

7.1

Boarding

8.2

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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, 35 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?

    $89 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 American Airlines, with prices starting from $89 and $97, 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: Sun Country Air (100%), Republic Airways (100%), Aer Lingus (90%).

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

    While on average a flight from St. Louis to Pennsylvania is generally $2,571, our data shows the cheapest flight currently is $154. When looking at the most popular route, (Lambert-St Louis - Newark), you can expect to pay $174 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.

See more FAQs

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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 April 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$87FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$131Average$383FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$374FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$223Average$434FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$273Average$389FlexibilityNo cancel feeOn-time63%

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