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St. Charles

$55+ 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 11/13. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — STL
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to St. Charles are usually found in September or August, booked 87 days in advance, depart on a Wednesday or Thursday and return on a Thursday

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 October 30, 2025.

This Frontier deal was found by Cheapflights users on 10/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2110:00 pmPHL - STL
1 stop12h 45mFrontier
Tue 12/304:27 pmSTL - PHL
1 stop7h 21mFrontier
Deal found 10/28$300
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/2110:00 pmPHL - STL
1 stop12h 45mFrontier
Mon 12/2910:40 amSTL - PHL
2 stops12h 46mFrontier
Deal found 10/29$302
This American Airlines deal was found by Cheapflights users on 10/28. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:00 amPHL - STL
1 stop9h 09mAmerican Airlines
Tue 12/305:30 amSTL - PHL
Nonstop2h 17mAmerican Airlines
Deal found 10/28$303
This Frontier deal was found by Cheapflights users on 10/30. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/65:50 amPHL - STL
1 stop5h 22mFrontier
Sun 11/97:45 pmSTL - PHL
1 stop8h 04mFrontier
Deal found 10/30$306
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:00 amPHL - STL
1 stop17h 33mFrontier
Wed 12/314:27 pmSTL - PHL
1 stop7h 13mFrontier
Deal found 10/28$307
This Priceline deal was found by Cheapflights users on 10/28. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/247:10 amPHL - STL
1 stop10h 14mFrontier
Tue 12/304:27 pmSTL - PHL
1 stop7h 21mFrontier
Deal found 10/28$310
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/2311:12 amPHL - STL
2 stops8h 24mMultiple Airlines
Wed 12/314:27 pmSTL - PHL
1 stop7h 13mMultiple Airlines
Deal found 10/28$311
This Kiwi.com deal was found by Cheapflights users on 10/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:30 amPHL - STL
2 stops17h 03mFrontier
Wed 12/314:27 pmSTL - PHL
1 stop7h 13mFrontier
Deal found 10/28$313
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1610:10 pmPHL - STL
2 stops21h 26mMultiple Airlines
Fri 11/214:13 pmSTL - PHL
1 stop14h 19mMultiple Airlines
Deal found 10/29$314
This Kiwi.com deal was found by Cheapflights users on 10/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/176:15 amPHL - STL
1 stop8h 02mMultiple Airlines
Fri 11/214:13 pmSTL - PHL
2 stops20h 54mMultiple Airlines
Deal found 10/29$315
This Kiwi.com deal was found by Cheapflights users on 10/27. 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 11/86:50 pmPHL - STL
2 stops17h 19mMultiple Airlines
Sun 11/96:21 pmSTL - PHL
1 stop16h 31mMultiple Airlines
Deal found 10/27$319

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 October 30, 2025.

Most accurate provider

Gotogate
3 stars

Most trusted provider

Gotogate
3 stars

Round-trip from

$300
(Frontier)

One-way from

$55
(Frontier)

Popular in

May

Cheapest in

September

Average price

$398
Provider with most accurate pricing for Philadelphia-Lambert-St Louis flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Lambert-St Louis flights.
Search Deals
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 ($27 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

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 October 30, 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

Mon 12/15

6:05 pm-7:35 pm

Nonstop2h 30m

Lambert-St Louis

Wed 12/17

6:10 pm-9:15 pm

Nonstop2h 05m

$351

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 1/8

2:10 pm-3:50 pm

Nonstop2h 40m

Lambert-St Louis

Mon 1/12

8:20 am-11:30 am

Nonstop2h 10m

$351

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Wed 12/10

8:05 am-9:35 am

Nonstop2h 30m

Lambert-St Louis

Sat 12/13

8:25 am-11:30 am

Nonstop2h 05m

$352

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 12/2

6:00 pm-7:30 pm

Nonstop2h 30m

Lambert-St Louis

Sat 12/6

5:45 pm-8:50 pm

Nonstop2h 05m

$353

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Sat 1/17

9:45 am-11:36 am

Nonstop2h 51m

Lambert-St Louis

Sat 1/24

9:33 am-12:49 pm

Nonstop2h 16m

$381

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Mon 12/22

8:41 pm-9:40 am

1 stop13h 59m

Lambert-St Louis

Sat 12/27

10:10 pm-12:40 am

2 stops49h 30m

$385

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 11/13

5:05 am-1:17 pm

1 stop9h 12m

$55

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Wed 11/19

6:35 pm-11:01 pm

1 stop5h 26m

$55

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 11/18

6:50 pm-10:05 am

1 stop16h 15m

$61

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 1/13

12:32 pm-10:37 pm

1 stop11h 05m

$67

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/30

Showing 1-10 of 18 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 October 24, 2025.

Booking 87 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, March is the cheapest month in which you can book a flight from Philadelphia to St. Charles (average of $61). Flying from Philadelphia to St. Charles in December is currently the most expensive (average of $220). 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 October 30, 2025.

A simple way to save on the total cost of your ticket is to fly from Philadelphia to St. Charles in the afternoon. If you’re flexible enough to do this you can expect to save up to 23% on your trip compared to booking a flight at noon.

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 December 16, 2024.

Travelers seeking maximum savings on their Philadelphia to St. Charles flight should consider departing on Wednesday mornings 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.

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 October 30, 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
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

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
4,243 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

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
7.9
Good
7,998 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

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
11,035 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

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
8,116 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

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
3,122 reviews
Southwest
8.0
Very good
4,243 reviews

Boarding

8.1

Crew

8.6

Overall

8.0

Food

7.0

Comfort

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 2 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 37 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 30m. 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 (84%) or American Airlines (76%) 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 $318, our data shows the cheapest flight currently is $119. When looking at the most popular route, (Philadelphia - Lambert-St Louis), you can expect to pay $142 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, March is the cheapest month in which you can book a flight from Philadelphia to St. Charles (average of $61). Flying from Philadelphia to St. Charles in December is currently the most expensive (average of $220). 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$95Average$178FlexibilityNo cancel feeOn-time65%
FrontierCheapest$130Average$241FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$242Average$515FlexibilityNo cancel feeOn-time71%
DeltaCheapest$259Average$399FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$263Average$421FlexibilityNo cancel feeOn-time63%

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