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>

$81 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

Mon, Jun 22 - Fri, Jun 26

5:06 pm - 7:19 am

STL

PHL

13h 13m

1 stop

4:40 pm - 8:52 am

PHL

STL

17h 12m

1 stop

$124Frontier

Wed, Jun 17 - Fri, Jun 19

5:06 pm - 7:19 am

STL

PHL

13h 13m

1 stop

1:32 pm - 8:52 am

PHL

STL

20h 20m

1 stop

$128Frontier

Fri, Jul 3 - Wed, Jul 8

11:08 am - 5:22 pm

MLI

PHL

5h 14m

1 stop

10:40 am - 4:25 pm

PHL

MLI

6h 45m

1 stop

$261Delta

Sat, Jul 18 - Mon, Jul 20

5:10 pm - 12:59 am

MLI

PHL

6h 49m

1 stop

6:25 am - 10:12 am

PHL

MLI

4h 47m

1 stop

$285Delta

Wed, Jun 10 - Sat, Jun 13

1:13 pm - 7:19 pm

PIA

PHL

5h 06m

1 stop

8:05 am - 1:57 pm

PHL

PIA

6h 52m

1 stop

$319United Airlines

Fri, Jun 12 - Sun, Jun 14

2:31 pm - 9:19 pm

MLI

PHL

5h 48m

1 stop

6:00 am - 9:59 am

PHL

MLI

4h 59m

1 stop

$324United Airlines

Sat, Jun 6 - Tue, Jun 9

5:00 am - 11:37 am

BMI

PHL

5h 37m

1 stop

7:47 pm - 12:35 am

PHL

BMI

5h 48m

1 stop

$324American Airlines

Wed, Jun 10 - Sat, Jun 13

7:11 pm - 12:39 am

PIA

PHL

4h 28m

1 stop

5:15 am - 9:28 am

PHL

PIA

5h 13m

1 stop

$329American Airlines

Wed, Jun 10 - Wed, Jun 17

4:29 pm - 10:50 am

EVV

PHL

17h 21m

2 stops

10:11 am - 3:49 pm

PHL

EVV

6h 38m

1 stop

$491Multiple Airlines

Fri, Jun 5 - Wed, Jun 10

8:40 pm - 8:18 pm

EVV

PHL

46h 38m

2 stops

10:11 am - 3:49 pm

PHL

EVV

6h 38m

1 stop

$493Multiple Airlines

Useful Info

Low season	January
High season	June
Cheapest flight	$81

Best time to beat the crowds with an average 9% drop in price.

Most popular time to fly with an average 6% increase in price.

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

Essington

North Wildwood

Vineland

West Chester

Elkton

Pottstown

Willow Grove

Kennett Square

Middletown

Somers Point

Voorhees

Wyomissing

Glen Mills

Millville

Blackwood

Phoenixville

Bird in Hand

Strasburg

Everything you need to know for your flight to Philadelphia

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Cabin class

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

$81 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