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$45+ Cheap flights from Pennsylvania to St. Louis (STL)

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.
PHL — STL
Feb 4 — Feb 111
Tue 2/4
Tue 2/11
1 adult, Economy
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Cheap flight deals from Pennsylvania to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Pennsylvania (USPA) to St. Louis (STL). 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 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$107
(Cheapflightsfares)

One-way from

$45
(FlightHub)

Popular in

January

Cheapest in

July

Average price

$430

Good round-trip deal

$394 or less

Good one-way deal

$206 or less
Provider with most accurate pricing for Philadelphia-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Philadelphia-Lambert-St Louis flights.
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From Pennsylvania to Lambert-St Louis
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One-way flight from Pennsylvania to Lambert-St Louis
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Highest demand for flights based on searches. 20% potential increase in price ($88 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in January 2025
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Price to beat on a round-trip flight from Pennsylvania to Lambert-St Louis.
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Price to beat on a one-way flight from Pennsylvania to Lambert-St Louis.
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Find flight deals from Pennsylvania to St. Louis

Cheapest flights from Pennsylvania to St. Louis
Explore the most affordable flight options available from Pennsylvania to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 30, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 1/29. 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 2/256:25 amEWR - STL
1 stop9h 17mSpirit Airlines
Thu 2/274:00 pmSTL - EWR
1 stop7h 12mSpirit Airlines
Deal found 1/29$107
This Booking.com deal was found by Cheapflights users on 1/30. 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.
Tue 3/45:40 pmMDT - STL
1 stop7h 03mFrontier
Thu 3/65:24 pmSTL - MDT
1 stop17h 07mFrontier
Deal found 1/30$173
This Mytrip deal was found by Cheapflights users on 1/28. 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 3/29:29 amEWR - STL
2 stops35h 41mMultiple Airlines
Tue 3/44:00 pmSTL - EWR
1 stop7h 12mMultiple Airlines
Deal found 1/28$175
This Delta deal was found by Cheapflights users on 1/29. 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 3/117:00 amEWR - STL
1 stop6h 00mDelta
Wed 3/126:50 amSTL - EWR
1 stop4h 17mDelta
Deal found 1/29$197
This American Airlines deal was found by Cheapflights users on 1/30. 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 2/126:14 amAVP - STL
1 stop7h 31mAmerican Airlines
Sat 2/154:40 pmSTL - AVP
1 stop6h 43mAmerican Airlines
Deal found 1/30$199
This Mytrip deal was found by Cheapflights users on 1/29. 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 3/116:00 amLGA - STL
1 stop11h 42mMultiple Airlines
Wed 3/1212:15 pmSTL - LGA
2 stops26h 20mMultiple Airlines
Deal found 1/29$203
This Booking.com deal was found by Cheapflights users on 1/29. 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 2/73:00 pmJFK - STL
1 stop9h 31mFrontier
Tue 2/115:05 pmSTL - JFK
1 stop17h 57mFrontier
Deal found 1/29$204
This Mytrip deal was found by Cheapflights users on 1/29. 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 2/206:29 amLGA - STL
1 stop9h 13mSpirit Airlines
Sun 2/234:00 pmSTL - LGA
2 stops22h 51mSpirit Airlines
Deal found 1/29$206
This American Airlines deal was found by Cheapflights users on 1/30. 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 2/49:30 amLGA - STL
Nonstop3h 02mAmerican Airlines
Tue 2/43:10 pmSTL - LGA
1 stop7h 49mAmerican Airlines
Deal found 1/30$207
This CheapOair deal was found by Cheapflights users on 1/30. 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 2/185:59 pmLGA - STL
1 stop6h 44mFrontier
Wed 2/195:20 pmSTL - LGA
1 stop15h 40mFrontier
Deal found 1/30$210
This Southwest deal was found by Cheapflights users on 1/30. 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.
Sat 5/177:15 amLGA - STL
2 stops11h 30mSouthwest
Thu 5/226:10 amSTL - LGA
Nonstop2h 25mSouthwest
Deal found 1/30$214
This Delta deal was found by Cheapflights users on 1/30. 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 3/266:00 amJFK - STL
1 stop7h 00mDelta
Sat 3/294:29 pmSTL - JFK
1 stop7h 18mDelta
Deal found 1/30$217

Find flights from Pennsylvania to St. Louis within your budget

Customize your flight search to find flights from Pennsylvania to St. Louis 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 30, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Tue 2/25

6:25 am-2:42 pm

1 stop9h 17m

Lambert-St Louis

Thu 2/27

4:00 pm-12:12 am

1 stop7h 12m

$107

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Tue 3/4

5:40 pm-11:43 pm

1 stop7h 03m

Lambert-St Louis

Thu 3/6

5:24 pm-11:31 am

1 stop17h 07m

$173

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Sun 3/2

9:29 am-8:10 pm

2 stops35h 41m

Lambert-St Louis

Tue 3/4

4:00 pm-12:12 am

1 stop7h 12m

$175

NewarkSt. Louis

EWR - STL

EWRSTL

Newark

Tue 3/11

7:00 am-12:00 pm

1 stop6h 00m

Lambert-St Louis

Wed 3/12

6:50 am-12:07 pm

1 stop4h 17m

$197

ScrantonSt. Louis

AVP - STL

AVPSTL

Wilkes-Barre Scranton

Wed 2/12

6:14 am-12:45 pm

1 stop7h 31m

Lambert-St Louis

Sat 2/15

4:40 pm-12:23 am

1 stop6h 43m

$199

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

Tue 3/11

6:00 am-4:42 pm

1 stop11h 42m

Lambert-St Louis

Wed 3/12

12:15 pm-3:35 pm

2 stops26h 20m

$203

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

Thu 2/20

6:29 am-2:42 pm

1 stop9h 13m

Lambert-St Louis

Sun 2/23

4:00 pm-3:51 pm

2 stops22h 51m

$206

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

Thu 2/27

3:35 pm-5:40 pm

Nonstop3h 05m

Lambert-St Louis

Sat 3/1

5:45 pm-10:55 pm

1 stop4h 10m

$207

New YorkSt. Louis

JFK - STL

JFKSTL

New York John F Kennedy Intl

Sat 5/17

6:59 am-12:06 am

1 stop18h 07m

Lambert-St Louis

Thu 5/22

9:49 pm-5:30 am

1 stop30h 41m

$208

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

Tue 2/18

5:59 pm-11:43 pm

1 stop6h 44m

Lambert-St Louis

Wed 2/19

5:20 pm-10:00 am

1 stop15h 40m

$210

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/30

Showing 1-10 of 60 results
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Best time to book a flight from Pennsylvania to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Pennsylvania 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 Pennsylvania to St. Louis

Get recent, data-driven insights about flights from Pennsylvania to St. Louis including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Pennsylvania to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Pennsylvania to St. Louis (average of $311). Flying from Pennsylvania to St. Louis in March is currently the most expensive (average of $356). 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 PA to STL?

Find hourly flight availability from Pennsylvania to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated January 30, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Pennsylvania to St. Louis as you normally would.

Weekly flight availability from Pennsylvania to St. Louis

Explore weekly flight availability from Pennsylvania to St. Louis. 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 30, 2025.

The most flights from USPA to STL are scheduled on a Thursday (6 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (1 on average).

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated January 30, 2025.
To help decide which airline to fly from Pennsylvania to St. Louis, see what other customers have to say about 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
4,585 reviews

Food

7.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Boarding

8.2

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
4,585 reviews
Southwest
8.1
Very good
4,585 reviews

Food

7.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Boarding

8.2

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
9,686 reviews
Southwest
8.1
Very good
4,585 reviews

Food

7.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Boarding

8.2

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
8,450 reviews
Southwest
8.1
Very good
4,585 reviews

Food

7.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Boarding

8.2

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
8,906 reviews
Southwest
8.1
Very good
4,585 reviews

Food

7.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Boarding

8.2

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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
4,585 reviews

Food

7.1

Crew

8.7

Entertainment

7.7

Comfort

8.1

Boarding

8.2

Overall

8.1

Reviews

1 / 20

6.0
Good

Lauren,Dec 2024

MCI - DCA

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 Pennsylvania to St. Louis. 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 into for flights to St. Louis from Pennsylvania?

    Located just 12.7 mi from the city center, Lambert-St Louis (STL) is the airport most travelers will use when flying to St. Louis from Pennsylvania.

  • How popular is this Pennsylvania to St. Louis flight route?

    Flights from Pennsylvania to Lambert-St Louis have been viewed 18 times in the past calendar month.

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

    For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $45. Users have also found prices from $55 and $89 on Frontier and United Airlines, respectively.

  • What are the most popular routes from Pennsylvania to St. Louis?

    While some choose either New York LaGuardia - Lambert-St Louis or Washington, D.C. Dulles Intl - Lambert-St Louis, Newark - Lambert-St Louis is the most popular route from Pennsylvania to St. Louis.

  • What are the most reliable airlines from Pennsylvania to St. Louis?

    Consider Southwest (83%), American Airlines (74%) or Aer Lingus (71%) when booking your flight. These represent the most reliable airlines when flying from Pennsylvania to St. Louis.

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

    The cheapest flight price from Pennsylvania to St. Louis is $169. On average you can expect to pay $347. The most popular route, (Newark - Lambert-St Louis), can usually be booked for $154.

  • Can I find deals for flights from Pennsylvania to St. Louis that include hotel bookings?

    Yes. In addition to deals on Pennsylvania to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Pennsylvania to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Pennsylvania to St. Louis.

  • Can I find deals for business class flights from Pennsylvania to St. Louis?

    Yes. Cheapflights offers flight deals from Pennsylvania to St. Louis 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 Pennsylvania to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Pennsylvania to St. Louis (average of $311). Flying from Pennsylvania to St. Louis in March is currently the most expensive (average of $356). 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

Traveling to a place near Pennsylvania?

Book flights to Pennsylvania if you plan to visit one of these locations
Fenton
Fairview Heights
Maryland Heights
Collinsville
Wentzville
Eureka
St. Peters
Festus
Alton
Farmington
Chesterfield

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Pennsylvania to St. Louis

See prices for flight routes from nearby airports that may be better suited for you.
Newark to St. Louis flights
LaGuardia to St. Louis flights
O'Hare Intl to Kansas City flights
LaGuardia to Kansas City flights
Denver to Kansas City flights
Dulles Intl to St. Louis flights
Los Angeles to Kansas City flights
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John F Kennedy Intl to St. Louis flights
John F Kennedy Intl to Kansas City flights
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Dallas/Fort Worth to Kansas City flights
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Los Angeles to St. Louis flights
Seattle to Kansas City flights
Dulles Intl to Kansas City flights
Atlanta to Kansas City flights
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Atlanta to St. Louis flights
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Seattle to St. Louis flights
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Reagan-National to St. Louis flights
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Hobby to Kansas City flights
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Hobby to St. Louis flights
Salt Lake City to Kansas City flights
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George Bush Intcntl to Kansas City flights
Tampa to Kansas City flights
Orlando to Kansas City flights
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Ontario to St. Louis flights
Midway to Kansas City flights
Minneapolis to Kansas City flights
Midway to St. Louis flights

Top 6 airlines flying from Pennsylvania to St. Louis

Discover the top 6 airlines that operate flights from Pennsylvania to St. Louis. 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 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$52Average$97FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$138Average$359FlexibilityNo cancel feeOn-time71%
Spirit AirlinesCheapest$169Average$278FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$196Average$425FlexibilityNo cancel feeOn-time69%
DeltaCheapest$200Average$379FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$248Average$395FlexibilityNo cancel feeOn-time63%
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