How does KAYAK find such low prices on flights from Illinois to Philadelphia?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Philadelphia. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Philadelphia?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from Illinois is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Illinois to Philadelphia?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Philadelphia with an airline and back to Illinois with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Philadelphia?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Philadelphia from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$70 CHEAP FLIGHTS from Illinois to Philadelphia

PHL

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Cheap Flights from Illinois to Philadelphia

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to Philadelphia

Fri, May 8 - Sun, May 17

4:19 pm - 8:54 am

STL

PHL

15h 35m

1 stop

6:10 am - 2:48 pm

PHL

STL

9h 38m

1 stop

$140Frontier

Sat, Apr 25 - Sun, Apr 26

8:17 pm - 5:35 am

STL

PHL

8h 18m

1 stop

10:38 pm - 11:19 pm

PHL

STL

25h 41m

1 stop

$147Frontier

Thu, Apr 30 - Sat, May 2

11:21 am - 7:19 pm

STL

PHL

6h 58m

1 stop

4:42 pm - 11:19 pm

PHL

STL

7h 37m

1 stop

$160Frontier

Thu, Apr 30 - Mon, May 4

11:21 am - 12:54 am

STL

PHL

12h 33m

1 stop

8:44 pm - 8:55 am

PHL

STL

37h 11m

2 stops

$169Multiple Airlines

Mon, May 4 - Mon, May 11

8:17 pm - 5:34 am

STL

PHL

8h 17m

1 stop

8:44 pm - 5:33 pm

PHL

STL

21h 49m

2 stops

$175Multiple Airlines

Thu, May 7 - Mon, May 11

7:33 pm - 9:25 am

ORD

PHL

12h 52m

1 stop

8:44 pm - 11:15 pm

PHL

ORD

27h 31m

1 stop

$190Spirit Airlines

Wed, May 6 - Wed, May 13

6:05 am - 11:39 am

CMI

PHL

4h 34m

1 stop

5:12 pm - 9:35 pm

PHL

CMI

5h 23m

1 stop

$270American Airlines

Sat, May 2 - Sat, May 9

5:11 pm - 12:59 am

MLI

PHL

6h 48m

1 stop

4:06 pm - 10:21 pm

PHL

MLI

7h 15m

1 stop

$276Delta

Fri, Jul 3 - Wed, Jul 8

6:50 pm - 12:32 am

MLI

PHL

4h 42m

1 stop

4:55 pm - 10:00 pm

PHL

MLI

6h 05m

1 stop

$304American Airlines

Thu, Jul 30 - Sat, Aug 8

11:08 am - 5:12 pm

MLI

PHL

5h 04m

1 stop

6:00 am - 10:22 am

PHL

MLI

5h 22m

1 stop

$315Delta

Useful Info

Low season	January
High season	July
Cheapest flight	$70

Best time to beat the crowds with an average 3% drop in price.

Most popular time to fly and prices are also 11% lower on average.

Flight from St. Louis to Philadelphia

How does KAYAK find such low prices on flights from Illinois to Philadelphia?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Philadelphia.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Philadelphia?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to Philadelphia?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Philadelphia with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Philadelphia?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Philadelphia from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Wildwood Crest

Newark

North Wildwood

Vineland

Essington

West Chester

Elkton

Pottstown

Willow Grove

Kennett Square

Voorhees

Middletown

Somers Point

Wyomissing

Glen Mills

Phoenixville

Millville

Blackwood

Bird in Hand

Strasburg

Everything you need to know for your flight to Philadelphia

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Complete your trip

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Origins

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Return flight deals

Information on the airport you'll fly into in Philadelphia

Philadelphia (PHL)

PHL

$70 Find Cheap Flights from Illinois to Philadelphia

KAYAK searches hundreds of travel sites at once for deals on flights to Philadelphia

Cheap Flights from Illinois to Philadelphia

Recent round-trip flight deals from Illinois to Philadelphia

Recent one-way flight deals from Illinois to Philadelphia

Recent last minute flight deals from Illinois to Philadelphia

Recent direct flight deals from Illinois to Philadelphia

Good to know

FAQs for booking flights from Illinois to Philadelphia

How does KAYAK find such low prices on flights from Illinois to Philadelphia?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to Philadelphia.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to Philadelphia?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Philadelphia from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Illinois to Philadelphia?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Philadelphia with an airline and back to Illinois with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to Philadelphia?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Philadelphia from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Traveling to a place near Philadelphia?

Everything you need to know for your flight to Philadelphia

Information on the airport you'll fly into in Philadelphia

Cabin class types available on flights to Illinois

Complete your trip to Philadelphia with a hotel stay or car rental

Find direct flights for Philadelphia

Flights to other popular destinations

Flights from domestic origins to Philadelphia

Choose which airport to fly into in Philadelphia

Find deals for your return flight