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St. Charles

$84+ 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 4/29. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — STL
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
1 adult, Economy
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Cheapflights Tip: The best prices from Philadelphia to St. Charles are usually found in July or August, booked 86 days in advance, depart on a Saturday or Wednesday and return on a Friday

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 March 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$258
(Frontier)

One-way from

$84
(Priceline)

Popular in

March

Cheapest in

July

Average price

$433
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 Philadelphia to St. Charles
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One-way flight from Philadelphia to St. Charles
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Highest demand for flights based on searches. 20% potential increase in price ($84 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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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 March 26, 2025.

This Frontier deal was found by Cheapflights users on 3/25. 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 5/266:47 pmPHL - STL
1 stop6h 05mFrontier
Tue 6/35:45 pmSTL - PHL
1 stop6h 26mFrontier
Deal found 3/25$258
This Mytrip deal was found by Cheapflights users on 3/25. 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 4/147:00 amPHL - STL
2 stops12h 41mMultiple Airlines
Tue 4/156:10 pmSTL - PHL
2 stops19h 17mMultiple Airlines
Deal found 3/25$267
This Mytrip deal was found by Cheapflights users on 3/25. 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.
Fri 5/96:00 amPHL - STL
2 stops28h 15mSpirit Airlines
Sun 5/1110:10 amSTL - PHL
3 stops27h 52mSpirit Airlines
Deal found 3/25$271
This American Airlines deal was found by Cheapflights users on 3/25. 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 4/2210:48 amPHL - STL
1 stop8h 14mAmerican Airlines
Tue 4/292:03 pmSTL - PHL
Nonstop2h 12mAmerican Airlines
Deal found 3/25$330
This Southwest deal was found by Cheapflights users on 3/25. 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 5/218:05 amPHL - STL
Nonstop2h 25mSouthwest
Sat 5/243:45 pmSTL - PHL
1 stop4h 30mSouthwest
Deal found 3/25$352
This Delta deal was found by Cheapflights users on 3/25. 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.
Thu 4/175:20 amPHL - STL
1 stop5h 16mDelta
Thu 4/175:32 pmSTL - PHL
1 stop6h 17mDelta
Deal found 3/25$398
This United deal was found by Cheapflights users on 3/25. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/266:15 amPHL - STL
2 stops10h 15mUnited Airlines
Fri 5/305:27 pmSTL - PHL
1 stop6h 18mUnited Airlines
Deal found 3/25$450

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 March 26, 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 5/26

6:47 pm-11:52 pm

1 stop6h 05m

Lambert-St Louis

Mon 6/2

7:24 pm-5:10 am

1 stop8h 46m

$258

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Mon 4/14

7:00 am-6:41 pm

2 stops12h 41m

Lambert-St Louis

Tue 4/15

6:10 pm-2:27 pm

2 stops19h 17m

$267

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Fri 5/9

6:00 am-9:15 am

2 stops28h 15m

Lambert-St Louis

Sun 5/11

10:10 am-3:02 pm

3 stops27h 52m

$271

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 4/22

10:48 am-6:02 pm

1 stop8h 14m

Lambert-St Louis

Tue 4/29

2:03 pm-5:15 pm

Nonstop2h 12m

$330

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Wed 5/21

8:05 am-9:30 am

Nonstop2h 25m

Lambert-St Louis

Sat 5/24

3:45 pm-9:15 pm

1 stop4h 30m

$352

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 4/17

5:20 am-9:36 am

1 stop5h 16m

Lambert-St Louis

Thu 4/17

5:32 pm-12:49 am

1 stop6h 17m

$398

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Mon 5/26

6:15 am-3:30 pm

2 stops10h 15m

Lambert-St Louis

Fri 5/30

5:27 pm-12:45 am

1 stop6h 18m

$450

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 4/29

6:57 am-5:15 pm

1 stop11h 18m

$84

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 5/15

4:33 pm-12:06 am

1 stop8h 33m

$114

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Mon 5/5

7:00 am-6:41 pm

2 stops12h 41m

$118

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 14 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 March 21, 2025.

Booking 86 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 March 26, 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 Wednesday evenings 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.

Rainfall in St. Charles by month

Plan your trip to St. Charles by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Charles 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. Charles when rainfall is around 2.2 in.

Temperature in St. Charles by month

Plan your trip to St. Charles by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Charles, 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. 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 March 26, 2025.
See what other customers who have flown with Southwest, Delta and United Airlines from Philadelphia to St. Charles have to say. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Crew

8.6

Comfort

8.1

Entertainment

7.6

Boarding

8.2

Food

7.1

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
4,274 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Crew

8.6

Comfort

8.1

Entertainment

7.6

Boarding

8.2

Food

7.1

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
7,891 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Crew

8.6

Comfort

8.1

Entertainment

7.6

Boarding

8.2

Food

7.1

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
8,608 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Crew

8.6

Comfort

8.1

Entertainment

7.6

Boarding

8.2

Food

7.1

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
4,274 reviews

Overall

8.1

Crew

8.6

Comfort

8.1

Entertainment

7.6

Boarding

8.2

Food

7.1

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.
Spirit Airlines
6.3
Okay
7,878 reviews
Southwest
8.1
Very good
4,274 reviews

Overall

8.1

Crew

8.6

Comfort

8.1

Entertainment

7.6

Boarding

8.2

Food

7.1

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 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 28 times in the past calendar month.

  • What are the cheapest airlines to fly from Philadelphia to St. Charles one-way?

    One-way options have recently been found by users for as low as $84 on Spirit Airlines. Other airlines that offer cheap prices include Frontier from $114 and American Airlines from $169 one-way.

  • 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 Southwest (85%), Republic Airways (65%) or Aer Lingus (64%) 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 $311, our data shows the cheapest flight currently is $149. When looking at the most popular route, (Philadelphia - Lambert-St Louis), you can expect to pay $231 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.

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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 March 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$95FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$134Average$472FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$196Average$503FlexibilityNo cancel feeOn-time69%
DeltaCheapest$199Average$340FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$263Average$416FlexibilityNo cancel feeOn-time63%
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