Cheap flights from St. Louis to Philadelphia (STL - PHL) from $51

This is the cheapest one-way flight price, found on 9/23. Prices may vary by date and flight preferences.
STL — PHL
Sep 30 — Oct 71

The best prices from Lambert-St Louis to Philadelphia are usually found in January or February, booked 37 days in advance, depart on a Saturday or Sunday and return on a Saturday

How to find the cheapest flight from St. Louis (STL) to Philadelphia (PHL)

All the information you need to plan the best STL to PHL flight in 2023: compare St. Louis to Philadelphia flight prices with the expected peak season, weather and rainfall in Philadelphia.

Popular in

June

Cheapest in

January

Round-trip from

$248

One-way from

$117
High demand for flights, 14% potential price rise
Best time to find cheap flights, 17% potential price drop
From Lambert-St Louis to Philadelphia
One-way flight from Lambert-St Louis to Philadelphia

STL - PHL

Price

$248 - $428

PHL

Temperature

33.8 - 78.8 °F

PHL

Rainfall

2.7 - 4.4 inches

What is the cheapest day to fly round-trip from St. Louis to Philadelphia?

Departing on a Friday is a good option for securing a great price. You can expect to save up to 42% when planning your travel around this day of the week.

How far in advance should I book a flight from St. Louis to Philadelphia?

Users have found that booking a flight from St. Louis to Philadelphia at least 32 days early can save you up to 26% on average compared to booking a flight this week. If booking 32 days before your flight isn’t an option for you, users have found flights from St. Louis to Philadelphia for as little as $435 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $519 for flights departing within the next 3 days.

What is the cheapest month to fly from St. Louis to Philadelphia?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, January can be a great choice for travel to Philadelphia. Flights to Philadelphia from St. Louis in January are about $401 on average during January, but can be found for as low as $230.

When is the cheapest time to fly from St. Louis to Philadelphia (STL - PHL)?

It’s typically best to fly out from St. Louis to Philadelphia in the evening. Doing so could potentially save you 46% on the flight price compared to flying at noon, which is usually more expensive.

Cheap Spirit Airlines flights from St. Louis to Philadelphia

Find some of the cheapest Spirit Airlines flights traveling from St. Louis to Philadelphia. Make sure to double check the flight details before booking.

Cheap Delta flights from St. Louis to Philadelphia

Have a look at some of the cheapest available Delta flights departing from St. Louis and landing in Philadelphia. Ensure the flight price, dates, time, and airline match your criteria before you book.

Cheap St. Louis to Philadelphia flights in September & October 2023

The best prices found for STL to PHL flights for September, October
Listed are some of the best fares we've found on flights departing from St. Louis to Philadelphia in 2023. More deals are always being added, so be sure to check back regularly.

St. Louis to Philadelphia 2023 flight deals

Cheap flights to Philadelphia from St. Louis found for this year
Listed are some of the best fares we've found on flights departing from St. Louis to Philadelphia in 2023. More deals are always being added, so be sure to check back regularly.

Non-stop flights to Philadelphia from St. Louis

Save time with St. Louis to Philadelphia direct flight deals
For a shorter flight, select one of these non-stop flights from St. Louis to Philadelphia. Users seeking other options on flights from St. Louis to Philadelphia should update the search form at the top of the page.

One-way flights to Philadelphia from St. Louis

The cheapest one-way flights from St. Louis to Philadelphia
Take a look at some of the one-way flights we've detected from St. Louis to Philadelphia. For those needing a return trip from St. Louis, there is a search form available above.

Find flights from St. Louis to Philadelphia within your budget

Use the slider to find flights from St. Louis to Philadelphia that fit your budget.

Fly from

Any airport

Fly to

Any airport

Budget

$118 - $305

Route

Depart

Return

Price

Lambert-St LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 10/11

1 stop12h 58m

Philadelphia

Tue 10/17

1 stop19h 46m

Lambert-St LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 10/13

1 stop12h 07m

Philadelphia

Tue 10/17

1 stop8h 49m

Lambert-St LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 10/11

1 stop26h 23m

Philadelphia

Mon 10/16

1 stop19h 52m

Lambert-St LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 11/16

1 stop9h 17m

Philadelphia

Mon 11/20

1 stop21h 27m

Lambert-St LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 10/11

1 stop7h 17m

Philadelphia

Mon 10/16

2 stops17h 59m

Lambert-St LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 10/23

1 stop12h 24m

Philadelphia

Mon 10/30

2 stops21h 11m

Lambert-St LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 11/3

1 stop20h 35m

Philadelphia

Sun 11/5

1 stop23h 21m

Lambert-St LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Thu 11/16

Nonstop2h 04m

Philadelphia

Mon 11/20

Nonstop2h 43m

Lambert-St LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 12/25

1 stop6h 22m

Philadelphia

Sun 12/31

1 stop5h 00m

Flights are sorted by cheapest first

Deals found on 9/24

Reviews of airlines servicing Philadelphia

See what other customers who have flown with Spirit Airlines, Delta and Frontier from St. Louis to Philadelphia have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.1
Very good
1,393 reviews

Overall

8.1

Crew

8.6

Food

7.2

Entertainment

7.2

Comfort

8.0

Boarding

8.3

Reviews

1 / 10

The plane stalled on the tarmac for over 30 minutes. No Alaska Air staff were available to help passengers with connecting flights jump the customs line. I missed my connecting flight. Never flying Alaska again.

Alaska Airlines
8.1
Very good
1,393 reviews
Alaska Airlines
8.1
Very good
1,393 reviews

Overall

8.1

Crew

8.6

Food

7.2

Entertainment

7.2

Comfort

8.0

Boarding

8.3

Reviews

1 / 10

The plane stalled on the tarmac for over 30 minutes. No Alaska Air staff were available to help passengers with connecting flights jump the customs line. I missed my connecting flight. Never flying Alaska again.

Delta
7.9
Good
3,021 reviews
Alaska Airlines
8.1
Very good
1,393 reviews

Overall

8.1

Crew

8.6

Food

7.2

Entertainment

7.2

Comfort

8.0

Boarding

8.3

Reviews

1 / 10

The plane stalled on the tarmac for over 30 minutes. No Alaska Air staff were available to help passengers with connecting flights jump the customs line. I missed my connecting flight. Never flying Alaska again.

United Airlines
7.4
Good
1,890 reviews
Alaska Airlines
8.1
Very good
1,393 reviews

Overall

8.1

Crew

8.6

Food

7.2

Entertainment

7.2

Comfort

8.0

Boarding

8.3

Reviews

1 / 10

The plane stalled on the tarmac for over 30 minutes. No Alaska Air staff were available to help passengers with connecting flights jump the customs line. I missed my connecting flight. Never flying Alaska again.

American Airlines
7.2
Good
2,635 reviews
Alaska Airlines
8.1
Very good
1,393 reviews

Overall

8.1

Crew

8.6

Food

7.2

Entertainment

7.2

Comfort

8.0

Boarding

8.3

Reviews

1 / 10

The plane stalled on the tarmac for over 30 minutes. No Alaska Air staff were available to help passengers with connecting flights jump the customs line. I missed my connecting flight. Never flying Alaska again.

Spirit Airlines
6.3
Okay
1,483 reviews
Alaska Airlines
8.1
Very good
1,393 reviews

Overall

8.1

Crew

8.6

Food

7.2

Entertainment

7.2

Comfort

8.0

Boarding

8.3

Reviews

1 / 10

The plane stalled on the tarmac for over 30 minutes. No Alaska Air staff were available to help passengers with connecting flights jump the customs line. I missed my connecting flight. Never flying Alaska again.

Related info for your journey

Useful info, stats and facts about St. Louis to Philadelphia flights.

What airports do I use to fly from St. Louis to Philadelphia?

Booking a flight from Lambert-St Louis (STL) to Philadelphia (PHL) is your only option if you wish to fly from St. Louis to Philadelphia. On a typical day, there are 4 flights from Lambert-St Louis to Philadelphia, all of which are around 2h 04m for a nonstop flight. You can also purchase a plane ticket from 4 airlines when you book a flight from Lambert-St Louis to Philadelphia.

Can I find flights from St. Louis to Philadelphia for under $200 on Cheapflights?

Yes, there are multiple flights from St. Louis to Philadelphia for under $200. The cheapest flight booked recently is on Frontier for just $118, but on average you can expect to pay $152.

Are there nonstop flights from St. Louis to Philadelphia for under $300 on Cheapflights?

Cheapflights has at least 20 direct flights from St. Louis to Philadelphia under $300. A good price for a nonstop flight from St. Louis to Philadelphia is less than $394.

What days are nonstop flights available from St. Louis to Philadelphia?

You can find nonstop flights on the following days: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday.

How popular is this St. Louis to Philadelphia flight route?

How many flights depart from St. Louis to Philadelphia on average per day?

On average 15 flights depart from St. Louis to Philadelphia per day.
Early Morning (Midnight to 6am) - 13% of flight departures
Morning (6am - Noon) - 20% of flight departures
Afternoon (Noon - 6pm) - 60% of flight departures
Evening (6pm - Midnight) - 7% of flight departures

How long is the flight from St. Louis to Philadelphia?

There are many flights that can get you from St. Louis to Philadelphia in 12h 24m. Fly via Frontier or Spirit Airlines to get the fastest option. Airlines will cover a distance of 816 mi. This flight may include one or multiple stops.

What are the cheapest airlines flying from St. Louis to Philadelphia round-trip?

Cheapflights users have booked flights from St. Louis to Philadelphia round-trip from $118. Another airline that can offer you cheap pricing is Spirit Airlines. These flights start at 70% lower than the current average price 3 months from now.

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

For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $51. Users have also found prices from $58 and $143 on Frontier and American Airlines, respectively.

What are the most popular airlines that fly from St. Louis to Philadelphia?

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

No one likes to see their flight delayed. When booking a flight from St. Louis to Philadelphia consider choosing Aer Lingus (81%), Southwest (79%) or Qatar Airways (73%) as they are the most reliable in getting you off to your destination on time.

What are the cheapest flights from St. Louis to Philadelphia?

While on average a flight from St. Louis to Philadelphia is generally $1,051, our data shows the cheapest flight currently is $146. When looking at the most popular route, (Lambert-St Louis - Philadelphia), you can expect to pay $119 for that flight.

What does STL to PHL mean?

Lambert-St Louis Airport is STL and Philadelphia Airport is PHL. These codes are created by the International Air Transport Association (IATA) and airlines use them to identify the departing and arrival airports in the flight routes they service.

Alternative routes for St. Louis to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.

Top 4 airlines flying from St. Louis to Philadelphia

The chart below displays the airlines Cheapflights users traveling from St. Louis to Philadelphia choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$116Average$162FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
FrontierCheapest$161Average$212FlexibilityNo cancel feeOn-time62%
Search Frontier flights
American AirlinesCheapest$259Average$416FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapest$304Average$385FlexibilityNo cancel feeOn-timeN/A
Search Delta flights

Hourly flight availability from St. Louis to Philadelphia

See what time of day planes typically take off from St. Louis to Philadelphia
39%of flight departuresEarly morningMidnight to 6 am
13%of flight departuresMorning6 am to noon
29%of flight departuresAfternoonNoon to 6 pm
19%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from St. Louis to Philadelphia

See how many times per day planes take to the skies headed from St. Louis to Philadelphia
Sunday5daily flights
Monday5daily flights
Tuesday4daily flights
Wednesday4daily flights
Thursday4daily flights
Friday5daily flights
Saturday4daily flights
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