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$60+ 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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — STL
mar. 8 — mar. 151
sáb. 3/8
sáb. 3/15
1 adult, Economy
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Cheap flight deals from Pennsylvania to St. Louis

Keep the following information in mind while searching for Pennsylvania to St. Louis flight deals. Data was last updated marzo 3, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$183
(American Airlines)

One-way from

$60
(Cheapflightsfares)

Popular in

February

Cheapest in

July

Average price

$418

Good round-trip deal

$316 or less

Good one-way deal

$126 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. 18% potential increase in price ($78 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 March 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 marzo 3, 2025.

This American Airlines deal was found by Cheapflights users on 3/2. 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.
mar. 4/111:38 amPIT - STL
1 stop11h 40mAmerican Airlines
lun. 4/75:45 amSTL - PIT
1 stop9h 33mAmerican Airlines
Deal found 3/2$183
This Flightnetwork deal was found by Cheapflights users on 3/2. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 4/46:00 amJFK - STL
1 stop18h 46mFrontier
lun. 4/74:57 pmSTL - JFK
1 stop6h 46mFrontier
Deal found 3/2$183
This Southwest deal was found by Cheapflights users on 3/3. 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.
jue. 4/34:50 pmLGA - STL
1 stop6h 05mSouthwest
lun. 4/75:40 pmSTL - LGA
Nonstop2h 20mSouthwest
Deal found 3/3$187
This CheapOair deal was found by Cheapflights users on 3/3. 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.
vie. 4/411:30 amLGA - STL
1 stop13h 16mFrontier
dom. 4/64:57 pmSTL - LGA
1 stop16h 33mFrontier
Deal found 3/3$190
This CheapOair deal was found by Cheapflights users on 3/2. 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.
dom. 5/1110:00 pmLGA - STL
1 stop27h 06mMultiple Airlines
mar. 5/137:37 pmSTL - LGA
1 stop12h 23mMultiple Airlines
Deal found 3/2$191
This Delta deal was found by Cheapflights users on 3/3. 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.
vie. 4/46:59 pmLGA - STL
Nonstop2h 52mDelta
lun. 4/76:35 pmSTL - LGA
Nonstop2h 23mDelta
Deal found 3/3$197
This American Airlines deal was found by Cheapflights users on 3/2. 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.
mar. 4/19:00 amJFK - STL
1 stop5h 51mAmerican Airlines
mié. 4/235:00 amSTL - JFK
1 stop4h 30mAmerican Airlines
Deal found 3/2$197
This Booking.com deal was found by Cheapflights users on 3/3. 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.
vie. 4/119:46 amPIT - STL
1 stop15h 00mFrontier
dom. 4/134:57 pmSTL - PIT
1 stop14h 46mFrontier
Deal found 3/3$200
This United Airlines deal was found by Cheapflights users on 3/2. 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.
jue. 4/1011:25 amLGA - STL
1 stop5h 22mUnited Airlines
sáb. 4/129:39 amSTL - LGA
1 stop6h 36mUnited Airlines
Deal found 3/2$212
This Delta deal was found by Cheapflights users on 3/3. 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.
mié. 3/266:00 amJFK - STL
1 stop7h 00mDelta
sáb. 3/294:29 pmSTL - JFK
1 stop7h 18mDelta
Deal found 3/3$217
This American Airlines deal was found by Cheapflights users on 3/3. 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.
mié. 3/269:30 amLGA - STL
Nonstop2h 53mAmerican Airlines
sáb. 4/265:00 amSTL - LGA
1 stop4h 44mAmerican Airlines
Deal found 3/3$227
This United Airlines deal was found by Cheapflights users on 3/3. 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.
mar. 4/298:35 amIAD - STL
Nonstop2h 23mUnited Airlines
mié. 4/308:25 amSTL - IAD
Nonstop2h 09mUnited Airlines
Deal found 3/3$230

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 marzo 3, 2025.

Fly from

Pennsylvania

Fly to

St. Louis

Route

Depart

Return

Price

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

mar. 4/1

11:38 am-10:18 pm

1 stop11h 40m

Lambert-St Louis

lun. 4/7

5:45 am-4:18 pm

1 stop9h 33m

$183

New YorkSt. Louis

JFK - STL

JFKSTL

New York John F Kennedy Intl

vie. 4/4

6:00 am-11:46 pm

1 stop18h 46m

Lambert-St Louis

lun. 4/7

4:57 pm-12:43 am

1 stop6h 46m

$183

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

jue. 4/3

10:25 am-12:20 pm

Nonstop2h 55m

Lambert-St Louis

lun. 4/7

5:55 am-11:40 am

1 stop4h 45m

$187

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

vie. 4/4

11:30 am-11:46 pm

1 stop13h 16m

Lambert-St Louis

dom. 4/6

4:57 pm-10:30 am

1 stop16h 33m

$190

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

dom. 5/11

10:00 pm-12:06 am

1 stop27h 06m

Lambert-St Louis

mar. 5/13

7:37 pm-9:00 am

1 stop12h 23m

$191

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

vie. 4/4

4:00 pm-5:49 pm

Nonstop2h 49m

Lambert-St Louis

lun. 4/7

6:35 pm-9:58 pm

Nonstop2h 23m

$197

New YorkSt. Louis

JFK - STL

JFKSTL

New York John F Kennedy Intl

mar. 4/1

9:00 am-1:51 pm

1 stop5h 51m

Lambert-St Louis

mié. 4/23

5:00 am-10:30 am

1 stop4h 30m

$197

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

vie. 4/11

9:46 am-11:46 pm

1 stop15h 00m

Lambert-St Louis

dom. 4/13

4:57 pm-8:43 am

1 stop14h 46m

$200

New YorkSt. Louis

LGA - STL

LGASTL

New York LaGuardia

jue. 4/10

11:25 am-3:47 pm

1 stop5h 22m

Lambert-St Louis

sáb. 4/12

9:39 am-5:15 pm

1 stop6h 36m

$212

New YorkSt. Louis

JFK - STL

JFKSTL

New York John F Kennedy Intl

mié. 3/26

6:00 am-12:00 pm

1 stop7h 00m

Lambert-St Louis

sáb. 3/29

4:29 pm-12:47 am

1 stop7h 18m

$217

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/2

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 marzo 3, 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.

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 marzo 3, 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
4,333 reviews

Comfort

8.1

Overall

8.1

Boarding

8.2

Food

7.1

Entertainment

7.6

Crew

8.7

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
4,333 reviews
Southwest
8.1
Very good
4,333 reviews

Comfort

8.1

Overall

8.1

Boarding

8.2

Food

7.1

Entertainment

7.6

Crew

8.7

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
9,710 reviews
Southwest
8.1
Very good
4,333 reviews

Comfort

8.1

Overall

8.1

Boarding

8.2

Food

7.1

Entertainment

7.6

Crew

8.7

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
8,068 reviews
Southwest
8.1
Very good
4,333 reviews

Comfort

8.1

Overall

8.1

Boarding

8.2

Food

7.1

Entertainment

7.6

Crew

8.7

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
8,679 reviews
Southwest
8.1
Very good
4,333 reviews

Comfort

8.1

Overall

8.1

Boarding

8.2

Food

7.1

Entertainment

7.6

Crew

8.7

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
4,333 reviews

Comfort

8.1

Overall

8.1

Boarding

8.2

Food

7.1

Entertainment

7.6

Crew

8.7

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 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 19 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 $60. Users have also found prices from $75 and $89 on Frontier and Delta, respectively.

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

    While some choose either New York LaGuardia - Lambert-St Louis or New York John F Kennedy 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 (75%), Republic Airways (64%) or American Airlines (56%) 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 $167. On average you can expect to pay $524. The most popular route, (Newark - Lambert-St Louis), can usually be booked for $124.

  • 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

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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
John F Kennedy Intl to St. Louis flights
Dulles Intl to St. Louis flights
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Seattle to St. Louis flights
John F Kennedy Intl to Kansas City flights
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O'Hare Intl to Kansas City flights
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Dulles Intl to Kansas City flights
Philadelphia to St. Louis flights
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Boston to Kansas City flights
Dallas/Fort Worth to Kansas City flights
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Reagan-National to Kansas City flights
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Atlanta to St. Louis flights
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Baltimore to St. Louis flights
Sky Harbor Intl to St. Louis flights
Denver to St. Louis flights
Minneapolis to Kansas City flights
O'Hare Intl to St. Louis flights
Hobby to St. Louis flights
Sky Harbor Intl to Kansas City flights
Baltimore to Kansas City flights
George Bush Intcntl to St. Louis flights
Detroit to Kansas City flights
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Philadelphia to Kansas City flights
Love Field to St. Louis flights
Salt Lake City to Kansas City flights
Tampa to Kansas City flights
Portland to Kansas City flights
Salt Lake City to St. Louis flights
Portland to St. Louis flights
San Jose to Kansas City flights
Denver to Springfield flights
San Diego to St. Louis flights
Ontario to St. Louis flights
Sacramento to Kansas City 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 marzo 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$96FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$135Average$354FlexibilityNo cancel feeOn-time71%
Spirit AirlinesCheapest$169Average$278FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$196Average$430FlexibilityNo cancel feeOn-time69%
DeltaCheapest$199Average$371FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$253Average$389FlexibilityNo cancel feeOn-time63%
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