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.

$40 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

Wed, Oct 7 - Wed, Oct 14

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

7h 49m1 stop Atlanta Hartsfield-Jackson

12:35 pm - 5:40 pmPHL Philadelphia-STL Lambert-St Louis

6h 05m1 stop Atlanta Hartsfield-Jackson

$83Frontier

Wed, Oct 7 - Wed, Oct 14

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

7h 49m1 stop Atlanta Hartsfield-Jackson

12:35 pm - 5:40 pmPHL Philadelphia-STL Lambert-St Louis

6h 05m1 stop Atlanta Hartsfield-Jackson

$84Frontier

Sat, Sep 26 - Wed, Sep 30

8:10 pm - 5:20 pmSTL Lambert-St Louis-PHL Philadelphia

20h 10m2 stops Denver Intl Des Moines

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

5h 29m1 stop Atlanta Hartsfield-Jackson

$229Multiple Airlines

Wed, Oct 21 - Mon, Nov 2

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

11h 36m1 stop Atlanta Hartsfield-Jackson

2:58 pm - 1:21 pmPHL Philadelphia-STL Lambert-St Louis

23h 23m2 stops Nashville Intl Jonesboro

$230Multiple Airlines

Sat, Oct 3 - Sat, Oct 3

11:40 am - 2:54 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 14mnonstop

5:49 pm - 7:39 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 50mnonstop

$273American Airlines

Wed, Oct 7 - Sat, Oct 10

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

2h 20mnonstop

3:51 pm - 5:34 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 43mnonstop

$277American Airlines

Wed, Oct 21 - Thu, Oct 22

6:15 pm - 9:29 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 14mnonstop

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

2h 24mnonstop

$277United 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, Dec 3 - Mon, Dec 7

10:45 am - 2:00 pmSTL Lambert-St Louis-PHL Philadelphia

2h 15mnonstop

6:15 pm - 7:45 pmPHL Philadelphia-STL Lambert-St Louis

2h 30mnonstop

$277Southwest

Thu, Nov 19 - Mon, Nov 23

10:45 am - 2:00 pmSTL Lambert-St Louis-PHL Philadelphia

2h 15mnonstop

6:00 am - 7:40 amPHL Philadelphia-STL Lambert-St Louis

2h 40mnonstop

$277Southwest

Recent last minute flight deals from Illinois to Philadelphia

Sun, Sep 6 - Thu, Sep 10

8:30 pm - 11:53 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 23mnonstop

8:41 am - 6:23 pmPHL Philadelphia-ORD Chicago O'Hare Intl

10h 42m1 stop Atlanta Hartsfield-Jackson

$172Frontier

Sun, Sep 6 - Thu, Sep 10

8:30 pm - 11:53 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 23mnonstop

12:40 pm - 6:23 pmPHL Philadelphia-ORD Chicago O'Hare Intl

6h 43m1 stop Atlanta Hartsfield-Jackson

$178Frontier

Sat, Sep 5 - Wed, Sep 9

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

1h 55mnonstop

3:05 pm - 4:05 pmPHL Philadelphia-MDW Chicago Midway

2h 00mnonstop

$317Southwest

Sat, Sep 5 - Sat, Sep 12

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

1h 55mnonstop

8:05 am - 9:10 amPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$317Southwest

Sun, Sep 6 - Wed, Sep 9

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

2h 18mnonstop

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

2h 25mnonstop

$317United Airlines

Sat, Sep 5 - Sat, Sep 12

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

2h 24mnonstop

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

2h 25mnonstop

$317United Airlines

Sun, Sep 6 - Sat, Sep 12

5:30 am - 12:44 pmORD Chicago O'Hare Intl-PHL Philadelphia

6h 14m1 stop Atlanta Hartsfield-Jackson

9:35 am - 12:58 pmPHL Philadelphia-ORD Chicago O'Hare Intl

4h 23m1 stop Detroit Metropolitan Wayne County

$337Delta

Sat, Sep 5 - Wed, Sep 9

5:18 pm - 11:26 pmORD Chicago O'Hare Intl-PHL Philadelphia

5h 08m1 stop Detroit Metropolitan Wayne County

6:20 pm - 11:59 pmPHL Philadelphia-ORD Chicago O'Hare Intl

6h 39m1 stop Atlanta Hartsfield-Jackson

$337Delta

Sat, Sep 5 - Wed, Sep 9

6:00 am - 11:30 amCMI Champaign University-Willard-PHL Philadelphia

4h 30m1 stop Chicago O'Hare Intl

7:00 am - 12:53 pmPHL Philadelphia-CMI Champaign University-Willard

6h 53m1 stop Chicago O'Hare Intl

$352American Airlines

Wed, Sep 2 - Wed, Sep 9

4:54 pm - 10:23 pmCMI Champaign University-Willard-PHL Philadelphia

4h 29m1 stop Chicago O'Hare Intl

2:32 pm - 6:10 pmPHL Philadelphia-CMI Champaign University-Willard

4h 38m1 stop Chicago O'Hare Intl

$352American Airlines

Recent direct flight deals from Illinois to Philadelphia

Thu, Oct 1 - Mon, Oct 5

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

Fri, Oct 23 - 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

$159Frontier

Fri, Oct 30 - Mon, Nov 2

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

$160Frontier

Sat, Oct 3 - Sat, Oct 3

11:40 am - 2:54 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 14mnonstop

5:49 pm - 7:39 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 50mnonstop

$273American Airlines

Thu, Oct 1 - Thu, Oct 1

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

2h 15mnonstop

8:50 pm - 10:30 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 40mnonstop

$277American Airlines

Wed, Feb 3 - Sat, Feb 6

1:35 pm - 4:25 pmMDW Chicago Midway-PHL Philadelphia

1h 50mnonstop

7:30 am - 8:50 amPHL Philadelphia-MDW Chicago Midway

2h 20mnonstop

$277Southwest

Tue, Oct 6 - Thu, Oct 8

7:45 am - 10:40 amMDW Chicago Midway-PHL Philadelphia

1h 55mnonstop

6:55 am - 8:00 amPHL Philadelphia-MDW Chicago Midway

2h 05mnonstop

$277Southwest

Wed, Oct 21 - Thu, Oct 22

6:15 pm - 9:29 pmORD Chicago O'Hare Intl-PHL Philadelphia

2h 14mnonstop

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

2h 24mnonstop

$277United 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

Wed, Oct 7 - Sat, Oct 10

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

2h 20mnonstop

3:51 pm - 5:34 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 43mnonstop

$277American Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$40

Best time to beat the crowds with an average 14% 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

Somers Point

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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Complete your trip

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Return flight deals

Information on the airport you'll fly into in Philadelphia

Philadelphia (PHL)

PHL

$40 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

Low season

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