HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Pennsylvania

$67+ 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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PHL
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
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 September 11, 2025.

Round-trip from

$143
(Priceline)

One-way from

$67
(American Airlines)

Popular in

March

Cheapest in

August

Average price

$333

Good round-trip deal

$248 or less

Good one-way deal

$211 or less
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. 6% potential increase in price ($28 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 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 September 11, 2025.

This Priceline deal was found by Cheapflights users on 9/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/254:00 pmSTL - PHL
1 stop7h 57mFrontier
Mon 9/295:15 amPHL - STL
1 stop8h 47mFrontier
Deal found 9/10$143
This Priceline deal was found by Cheapflights users on 9/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/24:00 pmSTL - EWR
1 stop8h 06mFrontier
Sun 10/55:55 amEWR - STL
1 stop10h 09mFrontier
Deal found 9/10$144
This Frontier deal was found by Cheapflights users on 9/11. 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 9/261:57 pmSTL - PHL
1 stop9h 55mFrontier
Mon 9/295:15 amPHL - STL
1 stop8h 47mFrontier
Deal found 9/11$153
This Frontier deal was found by Cheapflights users on 9/11. 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.
Thu 9/254:00 pmSTL - EWR
1 stop7h 34mFrontier
Mon 9/295:55 amEWR - STL
1 stop10h 09mFrontier
Deal found 9/11$154
This Priceline deal was found by Cheapflights users on 9/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/231:41 pmSTL - PHL
1 stop10h 32mFrontier
Sat 10/2511:00 amPHL - STL
1 stop8h 02mFrontier
Deal found 9/10$155
This Frontier deal was found by Cheapflights users on 9/11. 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.
Mon 9/294:00 pmSTL - EWR
1 stop7h 34mFrontier
Mon 10/65:55 amEWR - STL
1 stop10h 09mFrontier
Deal found 9/11$155
This CheapOair deal was found by Cheapflights users on 9/11. 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 11/1611:17 amSTL - PHL
1 stop22h 35mFrontier
Tue 11/186:50 pmPHL - STL
1 stop16h 15mFrontier
Deal found 9/11$163
This Frontier deal was found by Cheapflights users on 9/10. 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.
Mon 9/224:00 pmSTL - EWR
1 stop7h 34mFrontier
Sun 9/285:55 amEWR - STL
1 stop10h 09mFrontier
Deal found 9/10$166
This Kiwi.com deal was found by Cheapflights users on 9/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/2710:18 amSTL - PHL
1 stop14h 30mFrontier
Fri 10/316:19 amPHL - STL
1 stop27h 48mFrontier
Deal found 9/10$167
This Booking.com deal was found by Cheapflights users on 9/10. 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 10/24:00 pmSTL - EWR
1 stop8h 06mFrontier
Wed 10/811:26 amEWR - STL
1 stop24h 11mFrontier
Deal found 9/10$167
This CheapOair deal was found by Cheapflights users on 9/10. 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.
Fri 10/246:42 pmSTL - PHL
1 stop18h 43mFrontier
Sun 10/268:15 amPHL - STL
1 stop26h 17mFrontier
Deal found 9/10$170
This Priceline deal was found by Cheapflights users on 9/10. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/910:57 amSTL - EWR
1 stop8h 03mMultiple Airlines
Thu 10/165:54 amEWR - STL
1 stop5h 43mMultiple Airlines
Deal found 9/10$170

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 September 11, 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. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Thu 10/2

4:00 pm-1:06 am

1 stop8h 06m

Newark

Sun 10/5

5:55 am-3:04 pm

1 stop10h 09m

$144

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 10/23

1:41 pm-1:13 am

1 stop10h 32m

Philadelphia

Sat 10/25

11:00 am-6:02 pm

1 stop8h 02m

$155

St. LouisHarrisburg

STL - MDT

STLMDT

Lambert-St Louis

Thu 10/23

1:41 pm-5:36 pm

1 stop26h 55m

Harrisburg

Fri 10/31

9:02 pm-3:38 pm

1 stop19h 36m

$186

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 10/15

8:15 am-11:20 am

Nonstop2h 05m

Philadelphia

Wed 10/22

6:30 pm-8:00 pm

Nonstop2h 30m

$192

St. LouisNewark

STL - EWR

STLEWR

Lambert-St Louis

Thu 10/2

5:00 am-10:27 am

1 stop4h 27m

Newark

Sat 10/4

9:50 pm-11:47 pm

Nonstop2h 57m

$193

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 10/16

8:15 pm-11:15 pm

Nonstop2h 00m

Washington, D.C. Reagan-National

Tue 10/21

2:35 pm-3:50 pm

Nonstop2h 15m

$196

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Tue 10/21

3:15 pm-6:20 pm

Nonstop2h 05m

Washington, D.C. Reagan-National

Thu 10/23

3:40 pm-5:00 pm

Nonstop2h 20m

$196

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Mon 11/10

6:09 pm-11:04 pm

1 stop3h 55m

Washington, D.C. Reagan-National

Tue 11/11

6:59 am-10:49 am

1 stop4h 50m

$197

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Fri 12/5

5:12 pm-11:39 pm

1 stop5h 27m

Washington, D.C. Reagan-National

Sun 12/7

6:06 am-9:48 am

1 stop4h 42m

$197

St. LouisWashington, D.C.

STL - DCA

STLDCA

Lambert-St Louis

Thu 11/6

1:30 pm-7:33 pm

1 stop5h 03m

Washington, D.C. Reagan-National

Sat 11/8

12:31 pm-4:10 pm

1 stop4h 39m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

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 September 11, 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 September 11, 2025.

The most flights from STL to USPA are scheduled on a Monday (11 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (7 on average).

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 September 11, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from St. Louis to Pennsylvania by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,960 reviews
Southwest
8.0
Very good
4,248 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Overall

8.0

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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, 16 users have taken a look at flights from Lambert-St Louis to Pennsylvania.

  • How long is the flight from St. Louis to Pennsylvania?

    Frontier, Southwest, and United Airlines can get you from St. Louis to Pennsylvania in just under 2h 05m. Your travel time can differ by up to 6h 01m. St. Louis and Pennsylvania are separated by a distance of 811 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the cheapest airlines to fly from St. Louis to Pennsylvania one-way?

    $67 is the cheapest one-way deal found within the past few days, from Southwest. You may also be able to find cheap deals on American Airlines and Frontier, with prices starting from $67 and $77, 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 John F Kennedy Intl, Lambert-St Louis - New York LaGuardia and Lambert-St Louis - Newark.

  • 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 (81%), Qatar Airways (69%), British Airways (67%).

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

    While on average a flight from St. Louis to Pennsylvania is generally $1,502, our data shows the cheapest flight currently is $142. When looking at the most popular route, (Lambert-St Louis - New York John F Kennedy Intl), you can expect to pay $159 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 Las Vegas flights
St. Louis to John F Kennedy Intl flights
St. Louis to LaGuardia flights
St. Louis to Denver flights
Kansas City to Las Vegas flights
St. Louis to Newark flights
St. Louis to Seattle flights
Kansas City to Newark flights
St. Louis to Orlando flights
Kansas City to Denver flights
Kansas City to LaGuardia flights
St. Louis to Dallas/Fort Worth flights
St. Louis to Sky Harbor Intl flights
Kansas City to O'Hare Intl flights
Kansas City to John F Kennedy Intl flights
Kansas City to Los Angeles flights
St. Louis to Hobby flights
St. Louis to Miami flights
Kansas City to Dallas/Fort Worth flights
Kansas City to Seattle flights
Kansas City to Atlanta flights
Kansas City to Orlando flights
St. Louis to Los Angeles flights
Kansas City to Sky Harbor Intl flights
Kansas City to Hobby flights
Kansas City to Miami flights
St. Louis to George Bush Intcntl flights
Kansas City to Dulles Intl flights
Kansas City to Boston flights
St. Louis to Salt Lake City flights
St. Louis to Boston flights
St. Louis to Dulles Intl flights
St. Louis to Atlanta flights
Kansas City to George Bush Intcntl flights
Kansas City to San Francisco flights
St. Louis to Baltimore flights
St. Louis to Minneapolis flights
Kansas City to San Diego flights
Kansas City to Minneapolis flights
Kansas City to Portland flights
St. Louis to San Francisco flights
Kansas City to Ontario flights
St. Louis to New Orleans flights
Kansas City to Midway flights
Kansas City to Tampa flights
Kansas City to Salt Lake City flights
Kansas City to Fort Lauderdale flights
St. Louis to San Diego flights
St. Louis to Honolulu flights
St. Louis to Tampa flights

Top 6 airlines flying from St. Louis to Pennsylvania

Discover the top 6 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 September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$106Average$219FlexibilityNo cancel feeOn-time65%
FrontierCheapest$128Average$230FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$198Average$391FlexibilityNo cancel feeOn-time71%
DeltaCheapest$211Average$404FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$248Average$512FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$253Average$392FlexibilityNo 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.