HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Pennsylvania

$79+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Pennsylvania with Cheapflights

1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”
2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.
3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 March 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$177
(Southwest)

One-way from

$79
(Mytrip)

Popular in

December

Cheapest in

June

Average price

$417

Good round-trip deal

$352 or less

Good one-way deal

$153 or less
Provider with most accurate pricing for Lambert-St Louis-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Philadelphia flights.
Search Deals
From Lambert-St Louis to Pennsylvania
Search Deals
One-way flight from Lambert-St Louis to Pennsylvania
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($65 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2025
Search Deals
Price to beat on a round-trip flight from Lambert-St Louis to Pennsylvania.
Search Deals
Price to beat on a one-way flight from Lambert-St Louis to Pennsylvania.
Search Deals

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 March 26, 2025.

This Southwest deal was found by Cheapflights users on 3/25. 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 4/248:00 pmSTL - LGA
Nonstop2h 25mSouthwest
Thu 5/16:00 amLGA - STL
Nonstop2h 45mSouthwest
Deal found 3/25$177
This Delta deal was found by Cheapflights users on 3/25. 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 4/246:59 pmSTL - LGA
Nonstop2h 23mDelta
Mon 4/289:59 amLGA - STL
Nonstop2h 57mDelta
Deal found 3/25$178
This United Airlines deal was found by Cheapflights users on 3/25. 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 5/205:29 pmSTL - EWR
1 stop6h 29mUnited Airlines
Sun 5/258:29 amEWR - STL
Nonstop2h 49mUnited Airlines
Deal found 3/25$187
This Mytrip deal was found by Cheapflights users on 3/25. 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 4/226:10 pmSTL - EWR
2 stops21h 31mSpirit Airlines
Tue 4/295:45 amEWR - STL
1 stop12h 30mSpirit Airlines
Deal found 3/25$191
This United Airlines deal was found by Cheapflights users on 3/25. 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 4/298:25 amSTL - LGA
1 stop4h 41mUnited Airlines
Wed 4/3011:25 amLGA - STL
1 stop5h 22mUnited Airlines
Deal found 3/25$192
This Delta deal was found by Cheapflights users on 3/25. 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 4/1512:51 pmSTL - JFK
1 stop5h 29mDelta
Mon 4/217:00 amJFK - STL
1 stop5h 45mDelta
Deal found 3/25$197
This Mytrip deal was found by Cheapflights users on 3/25. 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 5/712:15 pmSTL - LGA
2 stops19h 45mMultiple Airlines
Wed 5/146:00 amLGA - STL
1 stop28h 15mMultiple Airlines
Deal found 3/25$205
This Southwest deal was found by Cheapflights users on 3/25. 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 4/1512:25 pmSTL - DCA
1 stop5h 30mSouthwest
Wed 4/166:55 pmDCA - STL
Nonstop2h 15mSouthwest
Deal found 3/25$207
This Mytrip deal was found by Cheapflights users on 3/25. 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.
Thu 4/246:10 pmSTL - LGA
1 stop14h 52mSpirit Airlines
Mon 4/288:43 amLGA - STL
2 stops33h 32mSpirit Airlines
Deal found 3/25$209
This United Airlines deal was found by Cheapflights users on 3/25. 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 5/133:43 pmSTL - IAD
1 stop4h 14mUnited Airlines
Mon 5/266:48 amIAD - STL
1 stop6h 32mUnited Airlines
Deal found 3/25$209
This Delta deal was found by Cheapflights users on 3/25. 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.
Mon 4/141:46 pmSTL - DCA
1 stop4h 13mDelta
Fri 4/186:00 amDCA - STL
1 stop4h 28mDelta
Deal found 3/25$217
This Delta deal was found by Cheapflights users on 3/25. 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.
Mon 4/145:37 pmSTL - IAD
1 stop4h 30mDelta
Fri 4/1812:29 pmIAD - STL
1 stop4h 57mDelta
Deal found 3/25$217

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 March 26, 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

Thu 4/24

8:00 pm-11:25 pm

Nonstop2h 25m

New York LaGuardia

Thu 5/1

6:00 am-7:45 am

Nonstop2h 45m

$177

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Thu 4/24

6:59 pm-10:22 pm

Nonstop2h 23m

New York LaGuardia

Mon 4/28

9:59 am-11:56 am

Nonstop2h 57m

$178

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Tue 5/20

5:29 pm-12:58 am

1 stop6h 29m

Newark

Sun 5/25

8:29 am-10:18 am

Nonstop2h 49m

$187

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Tue 4/22

6:10 pm-4:41 pm

2 stops21h 31m

Newark

Tue 4/29

5:45 am-5:15 pm

1 stop12h 30m

$191

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Tue 4/29

8:25 am-2:06 pm

1 stop4h 41m

New York LaGuardia

Wed 4/30

11:25 am-3:47 pm

1 stop5h 22m

$192

St. LouisNew York

STL - JFK

STLJFK

Lambert-St Louis

Tue 4/15

4:11 pm-10:30 pm

1 stop5h 19m

New York John F Kennedy Intl

Wed 4/23

11:00 am-3:06 pm

1 stop5h 06m

$197

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Wed 5/7

12:15 pm-9:00 am

2 stops19h 45m

New York LaGuardia

Wed 5/14

6:00 am-9:15 am

1 stop28h 15m

$205

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 4/15

12:25 pm-6:55 pm

1 stop5h 30m

Washington, D.C. Reagan-National

Wed 4/16

6:55 pm-8:10 pm

Nonstop2h 15m

$207

St. LouisNew York

STL - LGA

STLLGA

Lambert-St Louis

Thu 4/24

6:10 pm-10:02 am

1 stop14h 52m

New York LaGuardia

Mon 4/28

8:43 am-5:15 pm

2 stops33h 32m

$209

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

Tue 5/13

3:43 pm-8:57 pm

1 stop4h 14m

Washington, D.C. Dulles Intl

Mon 5/26

6:48 am-12:20 pm

1 stop6h 32m

$209

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 60 results
1
2
3
...
6

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 March 26, 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 March 26, 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
4,273 reviews

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very good
9,789 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,891 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,608 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,273 reviews

Crew

8.6

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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?

    $79 is the cheapest one-way deal found within the past few days, from Spirit Airlines. You may also be able to find cheap deals on Delta and United Airlines, with prices starting from $89 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 John F Kennedy Intl and Lambert-St Louis - New York LaGuardia.

  • 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%), Qatar Airways (89%), Southwest (88%).

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

    While on average a flight from St. Louis to Pennsylvania is generally $2,340, 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 $177 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Pennsylvania

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Seattle flights
Kansas City to Seattle flights
St. Louis to Las Vegas flights
St. Louis to Denver flights
Kansas City to O'Hare Intl flights
St. Louis to Orlando flights
St. Louis to Miami flights
Kansas City to John F Kennedy Intl flights
Kansas City to Las Vegas flights
Kansas City to Boston flights
St. Louis to Newark flights
Kansas City to Miami flights
Kansas City to Newark flights
St. Louis to John F Kennedy Intl flights
Kansas City to Los Angeles flights
Kansas City to Dallas/Fort Worth flights
Kansas City to Hobby flights
St. Louis to LaGuardia flights
St. Louis to Sky Harbor Intl flights
Kansas City to Denver flights
Kansas City to Sky Harbor Intl flights
Kansas City to LaGuardia flights
St. Louis to Dallas/Fort Worth flights
Kansas City to San Francisco flights
Kansas City to Portland flights
St. Louis to Dulles Intl flights
St. Louis to Hobby flights
St. Louis to Atlanta flights
Kansas City to Atlanta flights
St. Louis to Boston flights
Kansas City to Orlando flights
St. Louis to San Francisco flights
Kansas City to Dulles Intl flights
St. Louis to Los Angeles flights
Kansas City to San Diego flights
Kansas City to George Bush Intcntl flights
St. Louis to O'Hare Intl flights
St. Louis to Honolulu flights
Kansas City to Tampa flights
St. Louis to George Bush Intcntl flights
Kansas City to Reagan-National flights
Kansas City to Fort Lauderdale flights
St. Louis to Philadelphia flights
Kansas City to Salt Lake City flights
St. Louis to Tampa flights
St. Louis to New Orleans flights
St. Louis to Detroit flights
Kansas City to Detroit flights
St. Louis to San Diego flights
St. Louis to Reagan-National 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 2,558,603 searches. Data last updated March 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$88FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$131Average$389FlexibilityNo cancel feeOn-time71%
DeltaCheapest$196Average$347FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$223Average$431FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$279Average$391FlexibilityNo cancel feeOn-time63%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.