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$53+ 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 1/27. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — STL
Nov 25 — Dec 21
Mon 11/25
Mon 12/2
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 November 20, 2024.

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 November 20, 2024.

This CheapOair deal was found by Cheapflights users on 11/20. 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 12/67:19 pmIAD - STL
1 stop28h 27mFrontier
Sun 12/85:02 pmSTL - IAD
1 stop22h 54mFrontier
Deal found 11/20$228
This CheapOair deal was found by Cheapflights users on 11/19. 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 12/87:00 amDCA - STL
1 stop26h 13mFrontier
Sat 12/146:46 pmSTL - DCA
1 stop16h 15mFrontier
Deal found 11/19$228
This United Airlines deal was found by Cheapflights users on 11/19. 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.
Wed 12/258:30 amIAD - STL
Nonstop2h 24mUnited Airlines
Fri 1/38:25 amSTL - IAD
Nonstop2h 18mUnited Airlines
Deal found 11/19$229
This American Airlines deal was found by Cheapflights users on 11/20. 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 12/107:44 amDCA - STL
Nonstop2h 37mAmerican Airlines
Fri 12/136:10 amSTL - DCA
Nonstop2h 08mAmerican Airlines
Deal found 11/20$229
This Southwest deal was found by Cheapflights users on 11/18. 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.
Sun 12/298:00 amDCA - STL
Nonstop2h 20mSouthwest
Fri 1/38:05 amSTL - DCA
Nonstop1h 55mSouthwest
Deal found 11/18$230
This American Airlines deal was found by Cheapflights users on 11/20. 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.
Fri 12/137:42 pmMDT - STL
1 stop5h 17mAmerican Airlines
Mon 12/161:45 pmSTL - MDT
1 stop5h 05mAmerican Airlines
Deal found 11/20$248
This Delta deal was found by Cheapflights users on 11/19. 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 12/166:00 amDCA - STL
1 stop7h 03mDelta
Mon 12/164:11 pmSTL - DCA
1 stop4h 18mDelta
Deal found 11/19$248
This Mytrip deal was found by Cheapflights users on 11/19. 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.
Mon 12/168:20 amPHL - STL
2 stops11h 21mMultiple Airlines
Thu 12/199:50 amSTL - PHL
2 stops9h 30mMultiple Airlines
Deal found 11/19$260
This American Airlines deal was found by Cheapflights users on 11/19. 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 12/176:59 amPIT - STL
1 stop10h 22mAmerican Airlines
Tue 12/245:45 amSTL - PIT
1 stop9h 48mAmerican Airlines
Deal found 11/19$263
This Mytrip deal was found by Cheapflights users on 11/20. 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 12/119:29 pmLGA - STL
2 stops23h 26mMultiple Airlines
Sat 12/144:26 pmSTL - LGA
1 stop16h 38mMultiple Airlines
Deal found 11/20$264
This FlightHub deal was found by Cheapflights users on 11/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/106:30 amLGA - STL
1 stop9h 51mSpirit Airlines
Tue 12/174:26 pmSTL - LGA
1 stop16h 38mSpirit Airlines
Deal found 11/19$265
This Mytrip deal was found by Cheapflights users on 11/18. 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 12/1810:47 pmPHL - STL
1 stop25h 41mFrontier
Wed 12/256:49 pmSTL - PHL
1 stop9h 20mFrontier
Deal found 11/18$265

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 2,629,791 searches. Data last updated November 20, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Fri 1/17

9:32 am-11:31 pm

1 stop14h 59m

Lambert-St Louis

Sun 1/19

8:22 am-6:52 pm

1 stop9h 30m

$208

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 2/26

6:03 pm-11:43 pm

1 stop6h 40m

Lambert-St Louis

Thu 2/27

5:20 pm-5:13 pm

1 stop22h 53m

$216

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 1/3

1:01 pm-8:13 am

1 stop20h 12m

Lambert-St Louis

Mon 1/6

6:49 pm-12:01 pm

1 stop16h 12m

$218

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 1/7

3:00 pm-4:30 pm

Nonstop2h 30m

Lambert-St Louis

Tue 1/7

7:15 pm-10:05 pm

Nonstop1h 50m

$225

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 12/25

8:30 am-9:54 am

Nonstop2h 24m

Lambert-St Louis

Fri 1/3

8:25 am-11:43 am

Nonstop2h 18m

$229

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Tue 12/10

7:44 am-9:21 am

Nonstop2h 37m

Lambert-St Louis

Wed 12/11

6:10 am-9:18 am

Nonstop2h 08m

$229

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 12/16

6:00 am-12:03 pm

1 stop7h 03m

Lambert-St Louis

Mon 12/16

4:11 pm-9:29 pm

1 stop4h 18m

$248

HarrisburgSt. Louis

MDT - STL

MDTSTL

Harrisburg

Fri 12/13

7:42 pm-11:59 pm

1 stop5h 17m

Lambert-St Louis

Mon 12/16

1:45 pm-7:50 pm

1 stop5h 05m

$248

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Mon 12/16

8:20 am-6:41 pm

2 stops11h 21m

Lambert-St Louis

Thu 12/19

9:50 am-8:20 pm

2 stops9h 30m

$260

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 12/17

6:59 am-4:21 pm

1 stop10h 22m

Lambert-St Louis

Tue 12/24

5:45 am-4:33 pm

1 stop9h 48m

$263

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/19

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, September is the cheapest month in which you can book a flight from Pennsylvania to St. Louis (average of $308). Flying from Pennsylvania to St. Louis in March is currently the most expensive (average of $357). 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 November 20, 2024.

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 November 20, 2024.

The most flights from USPA to STL are scheduled on a Monday (9 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (6 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 November 20, 2024.
To help decide which airline to fly from Pennsylvania to St. Louis, see what other customers have to say about Southwest, United 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
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Southwest
8.1
Very good
5,014 reviews
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Alaska Airlines
8.0
Very good
9,461 reviews
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

Delta
8.0
Very good
8,756 reviews
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

United Airlines
7.4
Good
9,171 reviews
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

WestJet
7.3
Good
2,811 reviews
Southwest
8.1
Very good
5,014 reviews

Crew

8.7

Comfort

8.1

Overall

8.1

Boarding

8.2

Entertainment

7.7

Food

7.2

Reviews

1 / 10

Great service throughout our flight. Easy boarding with early bird check in

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 14 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 Frontier. According to our data, you can fly for as low as $53. Users have also found prices from $93 and $101 on American Airlines and Spirit 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 Republic Airways (92%), PSA Airlines (91%) or Qatar Airways (88%) 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 $154. On average you can expect to pay $346. The most popular route, (Newark - Lambert-St Louis), can usually be booked for $214.

  • 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, September is the cheapest month in which you can book a flight from Pennsylvania to St. Louis (average of $308). Flying from Pennsylvania to St. Louis in March is currently the most expensive (average of $357). 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.

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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.
Reagan-National to Kansas City flights
Dulles Intl to Kansas City flights
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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 2,629,791 searches. Data last updated November 20, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$52Average$97FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$143Average$361FlexibilityNo cancel feeOn-time71%
Spirit AirlinesCheapest$149Average$278FlexibilityNo cancel feeOn-time65%
United AirlinesCheapest$196Average$445FlexibilityNo cancel feeOn-time69%
DeltaCheapest$200Average$394FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$238Average$380FlexibilityNo cancel feeOn-time63%
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