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.

$46 CHEAP FLIGHTS from Illinois to Philadelphia

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Flight Deals

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

Wed, Oct 7 - Wed, Oct 14

2:29 pm - 11:18 pmSTL Lambert-St Louis-PHL Philadelphia

7h 49m1 stop Atlanta Hartsfield-Jackson

8:30 am - 5:40 pmPHL Philadelphia-STL Lambert-St Louis

10h 10m1 stop Atlanta Hartsfield-Jackson

$84Frontier

Wed, Oct 21 - Wed, Oct 28

6:35 pm - 7:11 amSTL Lambert-St Louis-PHL Philadelphia

11h 36m1 stop Atlanta Hartsfield-Jackson

12:36 pm - 5:40 pmPHL Philadelphia-STL Lambert-St Louis

6h 04m1 stop Atlanta Hartsfield-Jackson

$85Frontier

Sat, Jan 30 - Tue, Feb 2

7:40 am - 10:35 amMDW Chicago Midway-PHL Philadelphia

1h 55mnonstop

7:35 am - 8:55 amPHL Philadelphia-MDW Chicago Midway

2h 20mnonstop

$185Southwest

Sat, Oct 31 - Sat, Nov 7

9:00 am - 11:55 amMDW Chicago Midway-PHL Philadelphia

1h 55mnonstop

7:50 am - 9:10 amPHL Philadelphia-MDW Chicago Midway

2h 20mnonstop

$185Southwest

Wed, Feb 3 - Sat, Feb 6

7:29 pm - 10:37 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 08mnonstop

7:19 am - 9:07 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 48mnonstop

$185American Airlines

Sat, Oct 31 - Sat, Nov 7

4:50 pm - 8:10 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 20mnonstop

9:22 am - 11:04 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 42mnonstop

$185American Airlines

Sat, Oct 10 - Tue, Oct 13

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

2h 18mnonstop

9:34 am - 10:59 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 25mnonstop

$185United Airlines

Sat, Oct 17 - Tue, Oct 20

7:00 am - 10:11 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 11mnonstop

9:34 am - 10:59 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 25mnonstop

$185United Airlines

Sat, Oct 10 - Sat, Oct 17

5:29 pm - 11:08 pmORD Chicago O'Hare Intl-PHL Philadelphia

4h 39m1 stop Detroit Metropolitan Wayne County

5:29 pm - 8:30 pmPHL Philadelphia-ORD Chicago O'Hare Intl

4h 01m1 stop Detroit Metropolitan Wayne County

$204Delta

Sat, Oct 17 - Sat, Oct 24

6:44 pm - 11:08 pmMDW Chicago Midway-PHL Philadelphia

3h 24m1 stop Detroit Metropolitan Wayne County

6:10 am - 9:32 amPHL Philadelphia-MDW Chicago Midway

4h 22m1 stop Detroit Metropolitan Wayne County

$205Delta

Recent last minute flight deals from Illinois to Philadelphia

Fri, Sep 25 - Mon, Oct 19

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

2h 24mnonstop

9:09 pm - 10:39 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 30mnonstop

$198Frontier

Fri, Sep 25 - Tue, Oct 27

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

2h 24mnonstop

8:30 am - 6:45 pmPHL Philadelphia-ORD Chicago O'Hare Intl

11h 15m1 stop Atlanta Hartsfield-Jackson

$228Frontier

Tue, Sep 22 - Tue, Oct 6

6:13 pm - 9:27 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 14mnonstop

11:05 am - 12:29 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 24mnonstop

$290United Airlines

Tue, Sep 22 - Tue, Oct 6

9:53 am - 2:40 pmORD Chicago O'Hare Intl-PHL Philadelphia

3h 47m1 stop Washington, D.C. Reagan-National

9:02 pm - 10:30 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 28mnonstop

$300American Airlines

Wed, Sep 23 - Mon, Oct 5

2:30 pm - 5:54 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 24mnonstop

7:10 pm - 8:40 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 30mnonstop

$303United Airlines

Wed, Sep 23 - Tue, Oct 6

11:17 am - 4:32 pmORD Chicago O'Hare Intl-PHL Philadelphia

4h 15m1 stop Detroit Metropolitan Wayne County

12:32 pm - 4:32 pmPHL Philadelphia-ORD Chicago O'Hare Intl

5h 00m1 stop Detroit Metropolitan Wayne County

$310Delta

Wed, Sep 23 - Wed, Oct 7

11:17 am - 4:32 pmORD Chicago O'Hare Intl-PHL Philadelphia

4h 15m1 stop Detroit Metropolitan Wayne County

5:29 pm - 8:30 pmPHL Philadelphia-ORD Chicago O'Hare Intl

4h 01m1 stop Detroit Metropolitan Wayne County

$310Delta

Fri, Sep 25 - Mon, Oct 19

2:55 pm - 5:55 pmMDW Chicago Midway-PHL Philadelphia

2h 00mnonstop

8:15 pm - 11:55 pmPHL Philadelphia-MDW Chicago Midway

4h 40m1 stop Nashville Intl

$357Southwest

Fri, Sep 25 - Mon, Oct 19

5:55 am - 1:15 pmMDW Chicago Midway-PHL Philadelphia

6h 20m1 stop Nashville Intl

8:15 pm - 11:55 pmPHL Philadelphia-MDW Chicago Midway

4h 40m1 stop Nashville Intl

$367Southwest

Wed, Sep 23 - Wed, Oct 7

2:59 pm - 6:19 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 20mnonstop

7:25 am - 9:00 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 35mnonstop

$370American Airlines

Recent direct flight deals from Illinois to Philadelphia

Sat, Oct 24 - Sun, Oct 25

4:41 pm - 8:04 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 23mnonstop

9:09 pm - 10:39 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 30mnonstop

$160Frontier

Fri, Oct 16 - Fri, Oct 23

4:41 pm - 8:04 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 23mnonstop

9:09 pm - 10:39 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 30mnonstop

$160Frontier

Thu, Nov 5 - Sun, Nov 8

4:42 pm - 7:58 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 16mnonstop

9:09 pm - 10:43 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 34mnonstop

$161Frontier

Sat, Jan 30 - Tue, Feb 2

7:40 am - 10:35 amMDW Chicago Midway-PHL Philadelphia

1h 55mnonstop

7:35 am - 8:55 amPHL Philadelphia-MDW Chicago Midway

2h 20mnonstop

$185Southwest

Sat, Oct 31 - Sat, Nov 7

9:00 am - 11:55 amMDW Chicago Midway-PHL Philadelphia

1h 55mnonstop

7:50 am - 9:10 amPHL Philadelphia-MDW Chicago Midway

2h 20mnonstop

$185Southwest

Tue, Oct 6 - Sat, Oct 17

5:29 pm - 9:07 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 38mnonstop

9:21 am - 11:05 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 44mnonstop

$185American Airlines

Sat, Oct 31 - Sat, Nov 7

4:50 pm - 8:10 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 20mnonstop

9:22 am - 11:04 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 42mnonstop

$185American Airlines

Sat, Oct 17 - Tue, Oct 20

7:00 am - 10:11 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 11mnonstop

9:34 am - 10:59 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 25mnonstop

$185United Airlines

Tue, Nov 3 - Tue, Nov 10

6:24 pm - 9:38 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 14mnonstop

9:45 am - 11:20 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 35mnonstop

$185United Airlines

Wed, Dec 2 - Sat, Dec 5

11:25 am - 2:15 pmMDW Chicago Midway-PHL Philadelphia

1h 50mnonstop

4:05 pm - 5:20 pmPHL Philadelphia-MDW Chicago Midway

2h 15mnonstop

$185Southwest

Useful Info

Low season	January
High season	July
Cheapest flight	$46

Best time to beat the crowds with an average 13% drop in price.

Most popular time to fly with an average 9% 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

Willow Grove

Pottstown

Middletown

Somers Point

Kennett Square

Voorhees

Glen Mills

Wyomissing

Blackwood

Springfield

Millville

Phoenixville

Strasburg

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

Car rentals in Philadelphia

Hotels in Philadelphia

Vacations in Philadelphia

PHL

$46 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?

More options for your flight to Philadelphia

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

Information on the airport you'll fly into in Philadelphia

Cabin class types available on flights to Illinois

Find direct flights for Philadelphia

Flights from domestic origins to Philadelphia

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Find deals for your return flight