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St. Charles

$81+ Cheap flights from Philadelphia (PHL) to St. Charles, MO

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 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — STL
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to St. Charles are usually found in August or September, booked 64 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

Cheap flight deals from Philadelphia to St. Charles

Keep the following information in mind while searching for Philadelphia to St. Charles flight deals. Data was last updated September 15, 2025.

Round-trip from

$220
(Kiwi.com)

One-way from

$81
(Cheapflightsfares)

Popular in

May

Cheapest in

August

Average price

$355
From Philadelphia to St. Charles
Search Deals
One-way flight from Philadelphia to St. Charles
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($28 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Philadelphia to St. Charles

Cheapest flights from Philadelphia to St. Charles
Explore the most affordable flight options available from Philadelphia to St. Charles. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Frontier deal was found by Cheapflights users on 9/13. 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 9/295:15 amPHL - STL
2 stops8h 47mFrontier
Thu 10/210:49 amSTL - PHL
2 stops13h 10mFrontier
Deal found 9/13$219
This Frontier deal was found by Cheapflights users on 9/14. 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 9/295:15 amPHL - STL
1 stop10h 49mFrontier
Thu 10/911:32 amSTL - PHL
2 stops12h 41mFrontier
Deal found 9/14$220
This Frontier deal was found by Cheapflights users on 9/14. 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.
Sun 10/55:15 amPHL - STL
1 stop10h 49mFrontier
Wed 10/157:52 pmSTL - PHL
1 stop8h 27mFrontier
Deal found 9/14$221
This CheapOair deal was found by Cheapflights users on 9/13. 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 9/215:15 amPHL - STL
1 stop10h 49mFrontier
Sun 9/284:00 pmSTL - PHL
2 stops23h 55mFrontier
Deal found 9/13$222
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Sat 9/279:50 pmPHL - STL
1 stop12h 50mMultiple Airlines
Thu 10/910:57 amSTL - PHL
1 stop23h 55mMultiple Airlines
Deal found 9/14$224
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Wed 10/112:00 pmPHL - STL
1 stop22h 40mMultiple Airlines
Thu 10/910:57 amSTL - PHL
1 stop23h 55mMultiple Airlines
Deal found 9/14$225
This Frontier deal was found by Cheapflights users on 9/14. 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.
Sun 10/195:20 amPHL - STL
1 stop6h 17mFrontier
Thu 10/3011:07 amSTL - PHL
2 stops13h 10mFrontier
Deal found 9/14$226
This Frontier deal was found by Cheapflights users on 9/13. 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 10/136:18 amPHL - STL
2 stops15h 03mFrontier
Thu 10/231:41 pmSTL - PHL
1 stop10h 32mFrontier
Deal found 9/13$227
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Fri 10/245:12 pmPHL - STL
2 stops16h 55mFrontier
Mon 10/2710:18 amSTL - PHL
1 stop14h 30mFrontier
Deal found 9/14$228
This Frontier deal was found by Cheapflights users on 9/13. 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 9/255:15 amPHL - STL
1 stop10h 49mFrontier
Sun 9/284:00 pmSTL - PHL
1 stop7h 57mFrontier
Deal found 9/13$229
This Frontier deal was found by Cheapflights users on 9/13. 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 10/37:25 amPHL - STL
2 stops14h 12mFrontier
Tue 10/77:52 pmSTL - PHL
2 stops17h 25mFrontier
Deal found 9/13$230

Cheapflights Fare Finder

 
Customize your flight search to find flights from Philadelphia to St. Charles 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 15, 2025.
Use the filters below to find and compare flights from Philadelphia to St. Charles that are best for you.

Fly from

Philadelphia

Fly to

St. Charles

Route

Depart

Return

Price

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Sun 9/28

10:03 pm-1:02 pm

2 stops15h 59m

Lambert-St Louis

Sat 10/11

7:15 pm-9:32 am

1 stop13h 17m

$260

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 2/5

5:05 pm-6:40 pm

Nonstop2h 35m

Lambert-St Louis

Tue 2/17

6:25 am-12:35 pm

1 stop5h 10m

$266

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 10/21

6:30 pm-8:00 pm

Nonstop2h 30m

Lambert-St Louis

Tue 10/28

8:15 am-11:20 am

Nonstop2h 05m

$317

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 10/14

7:20 am-4:00 pm

1 stop9h 40m

Lambert-St Louis

Tue 10/21

8:15 am-11:20 am

Nonstop2h 05m

$327

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Wed 10/8

6:50 am-10:26 am

1 stop4h 36m

Lambert-St Louis

Wed 10/15

1:40 pm-7:47 pm

1 stop5h 07m

$337

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Wed 10/8

9:46 am-1:22 pm

1 stop4h 36m

Lambert-St Louis

Tue 10/14

6:14 pm-11:05 pm

1 stop3h 51m

$337

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Sat 10/11

11:15 am-12:50 pm

Nonstop2h 35m

Lambert-St Louis

Mon 10/13

8:15 pm-11:25 pm

Nonstop2h 10m

$351

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 11/13

7:40 am-9:10 am

Nonstop2h 30m

Lambert-St Louis

Mon 11/17

12:00 pm-3:05 pm

Nonstop2h 05m

$351

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Mon 9/29

5:15 am-1:02 pm

1 stop8h 47m

$83

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 10/16

5:20 am-10:37 am

1 stop6h 17m

$83

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/14

Showing 1-10 of 17 results
1
2

Best time to book a flight from Philadelphia to St. Charles

Have a flexible travel schedule? Discover the best time to fly to St. Charles from Philadelphia 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 Philadelphia to St. Charles

How far ahead should I book a flight from Philadelphia to St. Charles?

Use this chart to determine the optimal time to book a round-trip flight from Philadelphia to St. Charles. Price data was last updated on September 12, 2025.

Booking 64 days in advance of your planned departure date is, on average, the best time to get cheap flights from Philadelphia to St. Charles. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Philadelphia to St. Charles?

Currently, August is the cheapest month in which you can book a flight from Philadelphia to St. Charles (average of $311). Flying from Philadelphia to St. Charles 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 PHL to CH5?

Find hourly flight availability from Philadelphia to St. Charles. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

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

What is the cheapest day to fly from Philadelphia to St. Charles?

Use this chart to determine the cheapest time to fly round-trip from Philadelphia to St. Charles. Price data was last updated on October 13, 2024.

Travelers seeking maximum savings on their Philadelphia to St. Charles flight should consider departing on Saturday afternoons when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Philadelphia to St. Charles

Explore weekly flight availability from Philadelphia to St. Charles. 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 15, 2025.

The most flights from PHL to CH5 are scheduled on a Monday (9 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).

Reviews of airlines servicing St. Charles

Get insights into the airlines that provide service to St. Charles. 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. Charles. Reviews last updated September 15, 2025.
Read reviews from past customers who have flown Southwest, Delta, and American Airlines from Philadelphia to St. Charles. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

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
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

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
7,954 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

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
4,242 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

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
Spirit Airlines
6.3
Okay
8,015 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

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
3,172 reviews
Southwest
8.0
Very good
4,242 reviews

Food

7.0

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

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 Philadelphia to St. Charles. 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 Philadelphia to St. Charles?

    Philadelphia (PHL), located 7.0 mi from the city center, is the airport you fly out of when you book flights from Philadelphia to St. Charles. 5 airlines have flights from Philadelphia to St. Charles on a regular basis. Booking flights from Philadelphia to St. Charles should not be difficult; the airport handles an average of 6 outbound flights to St. Charles per day.

  • How popular is this Philadelphia to St. Charles flight route?

    Flights from Philadelphia to St. Charles have been viewed 36 times in the past calendar month.

  • How long is the flight from Philadelphia to St. Charles?

    Airlines like Southwest fly from Philadelphia to St. Charles in about 2h 35m. The time it takes to get you to your destination is usually consistent. The distance between Philadelphia and St. Charles is about 811 mi. All flights are typically nonstop.

  • What are the most reliable airlines from Philadelphia to St. Charles?

    No one likes to see their flight delayed. When booking a flight from Philadelphia to St. Charles consider choosing Republic Airways (100%), Southwest (72%) or American Airlines (70%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Philadelphia to St. Charles?

    While on average a flight from Philadelphia to St. Charles is generally $307, our data shows the cheapest flight currently is $146. When looking at the most popular route, (Philadelphia - Lambert-St Louis), you can expect to pay $176 for that flight.

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

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

  • How can I find direct flights from Philadelphia to St. Charles?

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

  • Can I find deals for business class flights from Philadelphia to St. Charles?

    Yes. Cheapflights offers flight deals from Philadelphia to St. Charles 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 Philadelphia to St. Charles?

    Currently, August is the cheapest month in which you can book a flight from Philadelphia to St. Charles (average of $311). Flying from Philadelphia to St. Charles 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

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Alternative routes for Philadelphia to St. Charles

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Philadelphia to St. Charles

Discover the top 5 airlines that operate flights from Philadelphia to St. Charles. 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$95Average$178FlexibilityNo cancel feeOn-time65%
FrontierCheapest$119Average$236FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$243Average$520FlexibilityNo cancel feeOn-time71%
DeltaCheapest$259Average$442FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$266Average$418FlexibilityNo cancel feeOn-time63%

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