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>

$76 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

Sat, May 16 - Tue, May 19

8:08 pm - 5:37 am

STL

PHL

8h 29m

1 stop

7:48 am - 5:33 pm

PHL

STL

10h 45m

1 stop

$140Frontier

Tue, May 26 - Tue, Jun 2

4:19 pm - 8:59 am

STL

PHL

15h 40m

1 stop

7:55 am - 11:57 pm

PHL

STL

17h 02m

1 stop

$160Frontier

Fri, Jul 3 - Wed, Jul 8

5:17 pm - 12:59 am

MLI

PHL

6h 42m

1 stop

6:25 am - 10:22 am

PHL

MLI

4h 57m

1 stop

$261Delta

Tue, Jun 23 - Fri, Jul 24

4:45 pm - 12:36 am

MLI

PHL

6h 51m

1 stop

5:07 am - 11:13 am

PHL

MLI

7h 06m

1 stop

$285American Airlines

Fri, Jul 3 - Thu, Jul 9

5:17 pm - 12:59 am

MLI

PHL

6h 42m

1 stop

6:25 am - 10:22 am

PHL

MLI

4h 57m

1 stop

$295Delta

Wed, Jun 10 - Sat, Jun 13

4:47 pm - 12:36 am

PIA

PHL

6h 49m

1 stop

7:37 pm - 12:38 am

PHL

PIA

6h 01m

1 stop

$309American Airlines

Fri, Jul 10 - Wed, Jul 15

9:44 am - 5:42 pm

BMI

PHL

6h 58m

1 stop

9:21 am - 2:23 pm

PHL

BMI

6h 02m

1 stop

$309United Airlines

Mon, May 18 - Sun, May 24

5:30 pm - 12:59 am

PIA

PHL

6h 29m

1 stop

9:21 am - 12:37 pm

PHL

PIA

4h 16m

1 stop

$329United Airlines

Fri, Jul 10 - Wed, Jul 15

9:35 am - 11:43 am

BMI

PHL

25h 08m

2 stops

5:05 pm - 7:09 pm

PHL

BMI

27h 04m

1 stop

$356Multiple Airlines

Mon, Aug 10 - Wed, Aug 12

9:04 am - 12:25 am

PIA

PHL

14h 21m

1 stop

5:16 pm - 8:45 am

PHL

PIA

16h 29m

2 stops

$356Multiple Airlines

Useful Info

Low season	January
High season	May
Cheapest flight	$76

Best time to beat the crowds but there is an average 1% increase in price.

Most popular time to fly and prices are also 1% 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

Essington

Vineland

West Chester

Elkton

Pottstown

Willow Grove

Kennett Square

Middletown

Voorhees

Somers Point

Wyomissing

Glen Mills

Millville

Phoenixville

Blackwood

Bird in Hand

Strasburg

Everything you need to know for your flight to Philadelphia

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Complete your trip

Direct Flights

Flights to other cities

Origins

Other airports

Return flight deals

Information on the airport you'll fly into in Philadelphia

Philadelphia (PHL)

PHL

$76 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