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.

$66 CHEAP FLIGHTS from Illinois to Philadelphia

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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, Sep 11 - Mon, Sep 14

2:29 pm - 7:16 amSTL Lambert-St Louis-PHL Philadelphia

15h 47m1 stop Atlanta Hartsfield-Jackson

8:41 am - 1:10 pmPHL Philadelphia-STL Lambert-St Louis

5h 29m1 stop Atlanta Hartsfield-Jackson

$142Frontier

Mon, Sep 14 - Mon, Sep 21

2:29 pm - 7:16 amSTL Lambert-St Louis-PHL Philadelphia

15h 47m1 stop Atlanta Hartsfield-Jackson

8:41 am - 1:10 pmPHL Philadelphia-STL Lambert-St Louis

5h 29m1 stop Atlanta Hartsfield-Jackson

$144Frontier

Fri, Sep 11 - Sun, Sep 13

7:25 am - 10:49 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 24mnonstop

7:00 am - 1:45 pmPHL Philadelphia-ORD Chicago O'Hare Intl

7h 45m1 stop Fort Lauderdale

$171Multiple Airlines

Fri, Sep 11 - Sun, Sep 13

7:25 am - 10:49 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 24mnonstop

7:00 am - 1:45 pmPHL Philadelphia-ORD Chicago O'Hare Intl

7h 45m1 stop Fort Lauderdale

$171Multiple Airlines

Wed, Sep 9 - Wed, Sep 16

1:00 pm - 4:00 pmMDW Chicago Midway-PHL Philadelphia

2h 00mnonstop

1:45 pm - 2:50 pmPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$189Southwest

Sat, Sep 26 - Sat, Oct 3

11:45 am - 2:40 pmMDW Chicago Midway-PHL Philadelphia

1h 55mnonstop

7:55 am - 9:00 amPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$189Southwest

Tue, Dec 1 - Wed, Dec 16

9:11 pm - 12:20 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 09mnonstop

12:47 pm - 2:20 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 33mnonstop

$189American Airlines

Sat, Sep 5 - Wed, Sep 9

4:59 pm - 8:16 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 17mnonstop

12:39 pm - 2:09 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 30mnonstop

$189American Airlines

Tue, Oct 20 - Tue, Oct 20

11:25 am - 2:43 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 18mnonstop

6:55 pm - 8:25 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 30mnonstop

$189United Airlines

Wed, Sep 16 - Sat, Sep 26

11:22 am - 2:40 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 18mnonstop

6:55 pm - 8:25 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 30mnonstop

$189United Airlines

Recent last minute flight deals from Illinois to Philadelphia

Sat, Aug 15 - Sun, Aug 16

8:52 pm - 12:15 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 23mnonstop

6:05 pm - 7:47 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 42mnonstop

$179Frontier

Sun, Aug 16 - Tue, Sep 22

8:52 pm - 12:15 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 23mnonstop

2:50 pm - 10:59 pmPHL Philadelphia-ORD Chicago O'Hare Intl

9h 09m1 stop Orlando

$203Frontier

Tue, Aug 18 - Tue, Sep 1

5:05 pm - 8:22 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 17mnonstop

8:51 pm - 10:30 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 39mnonstop

$314American Airlines

Tue, Aug 18 - Wed, Sep 2

8:49 pm - 11:59 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 10mnonstop

7:30 am - 9:05 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 35mnonstop

$314American Airlines

Tue, Aug 18 - Wed, Sep 2

1:00 pm - 4:00 pmMDW Chicago Midway-PHL Philadelphia

2h 00mnonstop

1:45 pm - 2:50 pmPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$314Southwest

Tue, Aug 18 - Wed, Sep 2

9:40 am - 5:35 pmMDW Chicago Midway-PHL Philadelphia

6h 55m1 stop Orlando

1:45 pm - 2:50 pmPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$324Southwest

Tue, Aug 18 - Wed, Sep 2

8:45 am - 2:21 pmORD Chicago O'Hare Intl-PHL Philadelphia

4h 36m1 stop Washington, D.C. Dulles Intl

10:34 am - 11:59 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 25mnonstop

$324United Airlines

Tue, Aug 18 - Tue, Sep 1

7:00 am - 4:37 pmORD Chicago O'Hare Intl-PHL Philadelphia

8h 37m1 stop Dallas/Fort Worth

9:12 am - 8:43 amPHL Philadelphia-ORD Chicago O'Hare Intl

24h 31m2 stops Boston Logan Intl New York John F Kennedy Intl

$374Multiple Airlines

Sun, Aug 16 - Sat, Aug 22

2:49 pm - 11:54 pmMDW Chicago Midway-PHL Philadelphia

32h 05m2 stops Knoxville McGhee Tyson Jacksonville

4:45 pm - 10:47 pmPHL Philadelphia-MDW Chicago Midway

7h 02m1 stop Atlanta Hartsfield-Jackson

$404Multiple Airlines

Sun, Aug 16 - Tue, Sep 22

6:29 pm - 9:43 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 14mnonstop

5:01 pm - 6:32 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 31mnonstop

$407United Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$66

Best time to beat the crowds with an average 10% drop in price.

Most popular time to fly with an average 13% 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

Somers Point

Pottstown

Willow Grove

Voorhees

Middletown

Kennett Square

Glen Mills

Wyomissing

Blackwood

Springfield

Millville

Phoenixville

Strasburg

Everything you need to know for your flight to Philadelphia

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Information on the airport you'll fly into in Philadelphia

Philadelphia (PHL)

PHL

$66 Find Cheap Flights from Illinois to Philadelphia - Compare and Save

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

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Cheapest flight

FAQs for booking flights from Illinois to Philadelphia

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

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Choose which airport to fly into in Philadelphia

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