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St. Louis

$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 7/10. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — STL
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
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 June 12, 2025.

Round-trip from

$183
(American Airlines)

One-way from

$60
(Booking.com)

Popular in

May

Cheapest in

August

Average price

$271

Good round-trip deal

$303 or less

Good one-way deal

$184 or less
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. 4% potential increase in price ($18 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in June 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 June 12, 2025.

This American Airlines deal was found by Cheapflights users on 6/11. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/289:00 amPIT - STL
1 stop8h 22mAmerican Airlines
Tue 11/411:20 amSTL - PIT
1 stop8h 48mAmerican Airlines
Deal found 6/11$183
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/271:05 pmPIT - STL
Nonstop1h 45mSouthwest
Tue 9/92:30 pmSTL - PIT
Nonstop1h 35mSouthwest
Deal found 6/10$197
This American Airlines deal was found by Cheapflights users on 6/10. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/42:59 pmDCA - STL
Nonstop2h 29mAmerican Airlines
Tue 7/86:00 amSTL - DCA
Nonstop2h 10mAmerican Airlines
Deal found 6/10$206
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/276:10 amIAD - STL
1 stop4h 25mDelta
Mon 9/295:40 pmSTL - IAD
1 stop5h 27mDelta
Deal found 6/11$208
This Delta deal was found by Cheapflights users on 6/12. 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.
Sat 9/610:11 amDCA - STL
1 stop5h 17mDelta
Mon 9/85:11 pmSTL - DCA
1 stop5h 35mDelta
Deal found 6/12$208
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/306:35 amIAD - STL
1 stop6h 52mUnited Airlines
Wed 8/66:33 amSTL - IAD
1 stop4h 22mUnited Airlines
Deal found 6/10$213
This United Airlines deal was found by Cheapflights users on 6/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/308:30 amDCA - STL
1 stop4h 57mUnited Airlines
Wed 8/65:00 amSTL - DCA
1 stop4h 56mUnited Airlines
Deal found 6/10$213
This Southwest deal was found by Cheapflights users on 6/10. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/306:35 pmDCA - STL
Nonstop2h 15mSouthwest
Wed 7/25:45 pmSTL - DCA
1 stop5h 05mSouthwest
Deal found 6/10$214
This Mytrip deal was found by Cheapflights users on 6/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/121:21 pmPIT - STL
2 stops21h 31mSpirit Airlines
Thu 7/1710:47 amSTL - PIT
2 stops11h 42mSpirit Airlines
Deal found 6/10$216
This Frontier deal was found by Cheapflights users on 6/11. 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.
Sat 7/266:10 amIAD - STL
1 stop8h 49mFrontier
Sat 8/22:52 pmSTL - IAD
1 stop7h 27mFrontier
Deal found 6/11$221
This Delta deal was found by Cheapflights users on 6/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2111:45 amPIT - STL
1 stop7h 17mDelta
Wed 10/293:30 pmSTL - PIT
1 stop6h 39mDelta
Deal found 6/11$235
This Cheapflightsfares deal was found by Cheapflights users on 6/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/135:59 amLGA - STL
1 stop4h 53mSpirit Airlines
Sat 7/1910:45 amSTL - LGA
1 stop11h 26mSpirit Airlines
Deal found 6/11$236

Cheapflights Fare Finder

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 June 12, 2025.
Use the filters below to find and compare flights from Pennsylvania to St. Louis that are best for you.

Fly from

Pennsylvania

Fly to

St. Louis

Route

Depart

Return

Price

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Tue 10/28

9:00 am-4:22 pm

1 stop8h 22m

Lambert-St Louis

Tue 11/4

11:20 am-9:08 pm

1 stop8h 48m

$183

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Wed 8/27

1:05 pm-1:50 pm

Nonstop1h 45m

Lambert-St Louis

Tue 9/9

2:30 pm-5:05 pm

Nonstop1h 35m

$197

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Fri 7/4

2:59 pm-4:28 pm

Nonstop2h 29m

Lambert-St Louis

Tue 7/8

6:00 am-9:10 am

Nonstop2h 10m

$206

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 9/27

6:10 am-9:35 am

1 stop4h 25m

Lambert-St Louis

Mon 9/29

5:40 pm-12:07 am

1 stop5h 27m

$208

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Sat 9/6

10:11 am-2:28 pm

1 stop5h 17m

Lambert-St Louis

Mon 9/8

5:11 pm-11:46 pm

1 stop5h 35m

$208

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Wed 7/30

6:35 am-12:27 pm

1 stop6h 52m

Lambert-St Louis

Wed 8/6

6:33 am-11:55 am

1 stop4h 22m

$213

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Wed 7/30

8:30 am-12:27 pm

1 stop4h 57m

Lambert-St Louis

Wed 8/6

5:00 am-10:56 am

1 stop4h 56m

$213

Washington, D.C.St. Louis

DCA - STL

DCASTL

Washington, D.C. Reagan-National

Mon 6/30

6:35 pm-7:50 pm

Nonstop2h 15m

Lambert-St Louis

Wed 7/2

5:45 pm-11:50 pm

1 stop5h 05m

$214

PittsburghSt. Louis

PIT - STL

PITSTL

Pittsburgh

Sat 7/12

1:21 pm-9:52 am

2 stops21h 31m

Lambert-St Louis

Thu 7/17

10:47 am-11:29 pm

2 stops11h 42m

$216

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 7/26

6:10 am-1:59 pm

1 stop8h 49m

Lambert-St Louis

Sat 8/2

2:52 pm-11:19 pm

1 stop7h 27m

$221

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

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.

Cheapflights Insights

Everything you need to know about your flight from Pennsylvania to St. Louis

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 June 12, 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 June 12, 2025.
To help decide which airline to fly from Pennsylvania to St. Louis, see what other customers have to say about Alaska Airlines, Southwest and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Food

7.1

Crew

8.5

Comfort

7.8

Overall

8.0

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 29 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 $97 and $98 on American Airlines and Southwest, respectively.

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

    While some choose either Washington, D.C. Dulles Intl - Lambert-St Louis or New York LaGuardia - 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 Iberia (70%), British Airways (70%) or Southwest (70%) 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 $126. On average you can expect to pay $325. The most popular route, (Newark - Lambert-St Louis), can usually be booked for $120.

  • 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
O'Fallon
Maryland Heights
Fairview Heights
Collinsville
Eureka
St. Peters
Glencoe
Festus
Alton
Farmington

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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
Dulles Intl to St. Louis flights
Dulles Intl to Kansas City flights
Newark to Kansas City flights
John F Kennedy Intl to Kansas City flights
LaGuardia to St. Louis flights
LaGuardia to Kansas City flights
O'Hare Intl to Kansas City flights
Denver to St. Louis flights
Baltimore to St. Louis flights
John F Kennedy Intl to St. Louis flights
Los Angeles to Kansas City flights
Boston to Kansas City flights
Dallas/Fort Worth to Kansas City flights
Los Angeles to St. Louis flights
Dallas/Fort Worth to St. Louis flights
O'Hare Intl to St. Louis flights
Reagan-National to Kansas City flights
Seattle to Kansas City flights
Reagan-National to St. Louis flights
Hobby to Kansas City flights
Boston to St. Louis flights
Atlanta to St. Louis flights
Seattle to St. Louis flights
Philadelphia to Kansas City flights
Baltimore to Kansas City flights
George Bush Intcntl to Kansas City flights
Minneapolis to St. Louis flights
San Francisco to St. Louis flights
Hobby to St. Louis flights
Denver to Kansas City flights
San Francisco to Kansas City flights
Atlanta to Kansas City flights
Salt Lake City to Kansas City flights
Ontario to Kansas City flights
Philadelphia to St. Louis flights
Salt Lake City to St. Louis flights
Portland to Kansas City flights
Ontario to St. Louis flights
George Bush Intcntl to St. Louis flights
Detroit to Kansas City flights
Sky Harbor Intl to Kansas City flights
Minneapolis to Kansas City flights
Denver to Springfield flights
Midway to Kansas City flights
Orlando to St. Louis flights
San Diego to St. Louis flights
Raleigh to Kansas City flights
Sky Harbor Intl to St. Louis flights
Tampa to Kansas City flights

Top 5 airlines flying from Pennsylvania to St. Louis

Discover the top 5 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 June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$50Average$110FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$156Average$352FlexibilityNo cancel feeOn-time71%
DeltaCheapest$200Average$342FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$236Average$460FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$247Average$379FlexibilityNo cancel feeOn-time63%

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