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.

$42 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

Mon, Nov 2 - Tue, Nov 3

6:44 pm - 7:21 amSTL Lambert-St Louis-PHL Philadelphia

11h 37m1 stop Atlanta Hartsfield-Jackson

5:22 pm - 5:40 pmPHL Philadelphia-STL Lambert-St Louis

25h 18m1 stop Atlanta Hartsfield-Jackson

$87Frontier

Wed, Oct 14 - Wed, Oct 21

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

11h 36m1 stop Atlanta Hartsfield-Jackson

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

10h 10m1 stop Atlanta Hartsfield-Jackson

$88Frontier

Thu, Oct 1 - Mon, Oct 5

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

2h 24mnonstop

5:59 pm - 11:51 amPHL Philadelphia-ORD Chicago O'Hare Intl

18h 52m2 stops Tampa St. Petersburg Atlanta Hartsfield-Jackson

$192Multiple Airlines

Fri, Oct 9 - Mon, Oct 12

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

2h 23mnonstop

6:14 pm - 11:32 amPHL Philadelphia-ORD Chicago O'Hare Intl

18h 18m2 stops Tampa St. Petersburg Atlanta Hartsfield-Jackson

$230Multiple Airlines

Wed, Sep 30 - Wed, Sep 30

5:00 am - 8:15 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 15mnonstop

7:39 pm - 9:30 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 51mnonstop

$237American Airlines

Thu, Oct 1 - Sat, Oct 3

8:45 am - 11:52 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 07mnonstop

4:04 pm - 5:44 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 40mnonstop

$237American Airlines

Thu, Dec 17 - Mon, Jan 18

9:20 pm - 12:34 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 14mnonstop

11:17 am - 12:51 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 34mnonstop

$237United Airlines

Thu, Oct 22 - Mon, Oct 26

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

2h 18mnonstop

10:54 am - 12:29 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 35mnonstop

$237United Airlines

Thu, Oct 22 - Mon, Oct 26

4:40 pm - 7:35 pmMDW Chicago Midway-PHL Philadelphia

1h 55mnonstop

7:10 pm - 8:15 pmPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$237Southwest

Thu, Oct 15 - Sat, Oct 17

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

1h 55mnonstop

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

2h 05mnonstop

$237Southwest

Recent last minute flight deals from Illinois to Philadelphia

Fri, Sep 11 - Sun, Sep 13

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

2h 24mnonstop

11:54 am - 1:30 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 36mnonstop

$204Frontier

Tue, Sep 15 - Tue, Sep 22

3:50 pm - 12:09 amORD Chicago O'Hare Intl-PHL Philadelphia

7h 19m1 stop Orlando

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

9h 09m1 stop Orlando

$259Frontier

Fri, Sep 11 - Mon, Oct 19

10:32 am - 5:54 pmPIA Greater Peoria-PHL Philadelphia

6h 22m1 stop Chicago O'Hare Intl

5:08 pm - 10:58 pmPHL Philadelphia-PIA Greater Peoria

6h 50m1 stop Chicago O'Hare Intl

$399United Airlines

Wed, Sep 16 - Sun, Sep 20

8:45 am - 11:52 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 07mnonstop

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

2h 30mnonstop

$419American Airlines

Wed, Sep 16 - Sun, Sep 20

8:45 am - 11:52 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 07mnonstop

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

2h 30mnonstop

$419American Airlines

Wed, Sep 16 - Fri, Sep 18

8:30 am - 11:35 amMDW Chicago Midway-PHL Philadelphia

2h 05mnonstop

2:05 pm - 3:10 pmPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$419Southwest

Wed, Sep 16 - Fri, Sep 18

6:00 am - 1:10 pmMDW Chicago Midway-PHL Philadelphia

6h 10m1 stop Dallas Love Field

6:05 pm - 7:10 pmPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$429Southwest

Fri, Sep 11 - Sun, Sep 13

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

7h 49m1 stop Atlanta Hartsfield-Jackson

7:41 pm - 1:21 pmPHL Philadelphia-STL Lambert-St Louis

18h 40m2 stops Nashville Intl Jonesboro

$438Multiple Airlines

Fri, Sep 11 - Mon, Sep 14

10:32 am - 5:54 pmPIA Greater Peoria-PHL Philadelphia

6h 22m1 stop Chicago O'Hare Intl

5:01 pm - 11:13 pmPHL Philadelphia-PIA Greater Peoria

7h 12m1 stop Chicago O'Hare Intl

$439United Airlines

Wed, Sep 16 - Wed, Sep 16

7:05 am - 11:44 amORD Chicago O'Hare Intl-PHL Philadelphia

3h 39m1 stop Detroit Metropolitan Wayne County

3:54 pm - 8:56 pmPHL Philadelphia-ORD Chicago O'Hare Intl

6h 02m1 stop Atlanta Hartsfield-Jackson

$441Delta

Recent direct flight deals from Illinois to Philadelphia

Thu, Oct 22 - Mon, Oct 26

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

$162Frontier

Sun, Oct 25 - Mon, Oct 26

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

$162Frontier

Mon, Nov 2 - Thu, Nov 5

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

$162Frontier

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

$237American Airlines

Thu, Oct 8 - Mon, Oct 12

6:29 am - 9:40 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 11mnonstop

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

2h 28mnonstop

$237American Airlines

Wed, Oct 21 - Thu, Oct 22

9:07 am - 12:25 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 18mnonstop

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

2h 25mnonstop

$237United Airlines

Mon, Dec 21 - Tue, Jan 5

9:20 pm - 12:34 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 14mnonstop

4:59 pm - 6:33 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 34mnonstop

$237United Airlines

Thu, Oct 22 - Mon, Oct 26

4:40 pm - 7:35 pmMDW Chicago Midway-PHL Philadelphia

1h 55mnonstop

7:10 pm - 8:15 pmPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$237Southwest

Thu, Oct 15 - Sat, Oct 17

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

1h 55mnonstop

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

2h 05mnonstop

$237Southwest

Thu, Oct 15 - Tue, Oct 20

9:00 pm - 12:12 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 12mnonstop

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

2h 35mnonstop

$237American Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$42

Best time to beat the crowds with an average 15% 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

$42 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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High season

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

Flights to other popular destinations

Find deals for your return flight