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.

$43 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, Sep 23 - Wed, Sep 30

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

7h 49m1 stop Atlanta Hartsfield-Jackson

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

5h 29m1 stop Atlanta Hartsfield-Jackson

$84Frontier

Fri, Oct 2 - Tue, Oct 6

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

15h 47m1 stop Atlanta Hartsfield-Jackson

5:32 pm - 1:10 pmPHL Philadelphia-STL Lambert-St Louis

20h 38m1 stop Atlanta Hartsfield-Jackson

$95Frontier

Thu, Sep 10 - 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

$200Multiple Airlines

Thu, Oct 1 - Sat, Oct 3

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

$204Multiple Airlines

Sat, Oct 10 - Mon, Oct 12

4:55 pm - 8:00 pmSTL Lambert-St Louis-PHL Philadelphia

2h 05mnonstop

6:25 am - 7:45 amPHL Philadelphia-STL Lambert-St Louis

2h 20mnonstop

$257Southwest

Wed, Jan 27 - Thu, Jan 28

5:50 pm - 8:55 pmSTL Lambert-St Louis-PHL Philadelphia

2h 05mnonstop

6:10 am - 7:45 amPHL Philadelphia-STL Lambert-St Louis

2h 35mnonstop

$257Southwest

Tue, Sep 22 - Sat, Sep 26

5:16 pm - 12:40 amMLI Moline Quad-City-PHL Philadelphia

6h 24m1 stop Atlanta Hartsfield-Jackson

6:00 am - 10:13 amPHL Philadelphia-MLI Moline Quad-City

5h 13m1 stop Atlanta Hartsfield-Jackson

$271Delta

Wed, Dec 23 - Tue, Dec 29

5:08 pm - 12:59 amMLI Moline Quad-City-PHL Philadelphia

6h 51m1 stop Atlanta Hartsfield-Jackson

4:02 pm - 10:57 pmPHL Philadelphia-MLI Moline Quad-City

7h 55m1 stop Atlanta Hartsfield-Jackson

$271Delta

Sat, Oct 24 - Tue, Oct 27

5:03 pm - 12:12 amMLI Moline Quad-City-PHL Philadelphia

6h 09m1 stop Chicago O'Hare Intl

7:25 am - 10:51 amPHL Philadelphia-MLI Moline Quad-City

4h 26m1 stop Chicago O'Hare Intl

$271American Airlines

Sat, Sep 12 - Mon, Sep 14

3:00 pm - 6:20 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 20mnonstop

10:20 pm - 11:56 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 36mnonstop

$277American Airlines

Recent last minute flight deals from Illinois to Philadelphia

Thu, Aug 27 - Sun, Sep 6

6:00 am - 9:17 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 17mnonstop

10:22 am - 11:55 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 33mnonstop

$207Frontier

Sun, Aug 30 - Thu, Oct 29

6:00 am - 9:17 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 17mnonstop

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

2h 34mnonstop

$232Frontier

Sat, Aug 29 - Sat, Sep 12

8:10 am - 11:15 amMDW Chicago Midway-PHL Philadelphia

2h 05mnonstop

3:40 pm - 4:45 pmPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$358Southwest

Sat, Aug 29 - Sat, Sep 12

8:10 am - 11:15 amMDW Chicago Midway-PHL Philadelphia

2h 05mnonstop

11:55 am - 4:10 pmPHL Philadelphia-MDW Chicago Midway

5h 15m1 stop Lambert-St Louis

$368Southwest

Sat, Aug 29 - Sat, Sep 12

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

2h 18mnonstop

8:30 am - 9:55 amPHL Philadelphia-ORD Chicago O'Hare Intl

2h 25mnonstop

$368United Airlines

Sat, Aug 29 - Sat, Sep 12

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

2h 24mnonstop

10:30 am - 4:29 pmPHL Philadelphia-ORD Chicago O'Hare Intl

6h 59m1 stop Washington, D.C. Dulles Intl

$378United Airlines

Sun, Aug 30 - Wed, Sep 30

5:00 am - 8:03 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 03mnonstop

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

2h 40mnonstop

$384American Airlines

Sun, Aug 30 - Wed, Oct 28

6:45 am - 9:54 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 09mnonstop

5:33 pm - 7:20 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 47mnonstop

$384American Airlines

Thu, Aug 27 - Wed, Sep 9

1:59 pm - 10:33 pmORD Chicago O'Hare Intl-PHL Philadelphia

7h 34m1 stop Atlanta Hartsfield-Jackson

7:59 pm - 2:45 pmPHL Philadelphia-ORD Chicago O'Hare Intl

43h 46m2 stops Tampa Fort Lauderdale

$399Multiple Airlines

Mon, Aug 31 - Fri, Sep 4

8:38 pm - 6:30 amPIA Greater Peoria-PHL Philadelphia

32h 52m1 stop Las Vegas Harry Reid Intl

8:00 am - 7:39 pmPHL Philadelphia-PIA Greater Peoria

12h 39m1 stop Las Vegas Harry Reid Intl

$652Multiple Airlines

Recent direct flight deals from Illinois to Philadelphia

Thu, Oct 8 - Sun, Oct 11

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

$155Frontier

Fri, Sep 18 - Mon, Sep 21

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

$155Frontier

Thu, Oct 1 - Sun, Oct 4

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

$155Frontier

Sat, Oct 10 - Mon, Oct 12

4:55 pm - 8:00 pmSTL Lambert-St Louis-PHL Philadelphia

2h 05mnonstop

6:25 am - 7:45 amPHL Philadelphia-STL Lambert-St Louis

2h 20mnonstop

$257Southwest

Wed, Jan 27 - Thu, Jan 28

5:50 pm - 8:55 pmSTL Lambert-St Louis-PHL Philadelphia

2h 05mnonstop

6:10 am - 7:45 amPHL Philadelphia-STL Lambert-St Louis

2h 35mnonstop

$257Southwest

Mon, Oct 5 - Mon, Oct 12

7:50 pm - 11:10 pmSTL Lambert-St Louis-PHL Philadelphia

2h 20mnonstop

6:25 am - 7:45 amPHL Philadelphia-STL Lambert-St Louis

2h 20mnonstop

$257Southwest

Thu, Dec 10 - Mon, Dec 14

6:02 am - 9:20 amSTL Lambert-St Louis-PHL Philadelphia

2h 18mnonstop

10:55 am - 12:43 pmPHL Philadelphia-STL Lambert-St Louis

2h 48mnonstop

$277American Airlines

Sat, Sep 26 - Thu, Oct 1

6:30 am - 9:50 amSTL Lambert-St Louis-PHL Philadelphia

2h 20mnonstop

8:06 pm - 9:43 pmPHL Philadelphia-STL Lambert-St Louis

2h 37mnonstop

$277American Airlines

Tue, Sep 22 - Wed, Sep 23

9:05 am - 12:23 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 18mnonstop

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

2h 31mnonstop

$277United Airlines

Thu, Sep 17 - Tue, Sep 22

6:55 am - 10:02 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 07mnonstop

1:30 pm - 2:55 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 25mnonstop

$277United Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$43

Best time to beat the crowds with an average 11% drop in price.

Most popular time to fly with an average 10% 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

Somers Point

Pottstown

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

$43 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

Good to know

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High season

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

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