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

Mon, Nov 9 - Wed, Nov 11

10:35 am - 7:36 amSTL Lambert-St Louis-PHL Philadelphia

20h 01m1 stop Atlanta Hartsfield-Jackson

5:28 pm - 9:40 amPHL Philadelphia-STL Lambert-St Louis

17h 12m1 stop Atlanta Hartsfield-Jackson

$135Frontier

Mon, Oct 26 - Mon, Nov 2

6:35 pm - 7:21 amSTL Lambert-St Louis-PHL Philadelphia

11h 46m1 stop Atlanta Hartsfield-Jackson

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

6h 05m1 stop Atlanta Hartsfield-Jackson

$139Frontier

Thu, Nov 12 - Mon, Nov 16

6:50 am - 10:00 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 10mnonstop

6:00 am - 1:20 pmPHL Philadelphia-ORD Chicago O'Hare Intl

8h 20m1 stop Boston Logan Intl

$190Multiple Airlines

Wed, Oct 7 - Sat, Oct 10

7:11 am - 7:04 pmORD Chicago O'Hare Intl-PHL Philadelphia

10h 53m2 stops Fort Lauderdale Tampa

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

2h 30mnonstop

$196Multiple Airlines

Sat, Oct 3 - Mon, Oct 5

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

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

Sat, Sep 26 - Wed, Sep 30

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

2h 20mnonstop

8:54 am - 10:29 amPHL Philadelphia-STL Lambert-St Louis

2h 35mnonstop

$257American Airlines

Mon, Sep 28 - Tue, Oct 6

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

2h 20mnonstop

8:34 am - 10:18 amPHL Philadelphia-STL Lambert-St Louis

2h 44mnonstop

$257American Airlines

Tue, Oct 13 - Tue, Oct 20

6:32 am - 12:25 pmMLI Moline Quad-City-PHL Philadelphia

4h 53m1 stop Chicago O'Hare Intl

6:10 am - 12:37 pmPHL Philadelphia-MLI Moline Quad-City

7h 27m1 stop Chicago O'Hare Intl

$271United Airlines

Sat, Nov 14 - Wed, Nov 18

7:07 am - 10:16 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 09mnonstop

4:59 pm - 6:34 pmPHL Philadelphia-ORD Chicago O'Hare Intl

2h 35mnonstop

$277United Airlines

Recent last minute flight deals from Illinois to Philadelphia

Fri, Aug 21 - Sun, Aug 23

8:37 am - 11:52 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 15mnonstop

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

2h 33mnonstop

$252Frontier

Fri, Aug 21 - Sun, Aug 23

8:37 am - 11:52 amORD Chicago O'Hare Intl-PHL Philadelphia

2h 15mnonstop

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

2h 33mnonstop

$259Frontier

Tue, Aug 25 - Sat, Aug 29

5:40 am - 12:23 pmMLI Moline Quad-City-PHL Philadelphia

5h 43m1 stop Chicago O'Hare Intl

6:56 pm - 11:14 pmPHL Philadelphia-MLI Moline Quad-City

5h 18m1 stop Chicago O'Hare Intl

$357United Airlines

Tue, Aug 25 - Sat, Aug 29

6:00 am - 3:05 pmMLI Moline Quad-City-PHL Philadelphia

8h 05m2 stops Chicago O'Hare Intl Washington, D.C. Reagan-National

7:30 am - 11:13 amPHL Philadelphia-MLI Moline Quad-City

4h 43m1 stop Chicago O'Hare Intl

$362American Airlines

Tue, Aug 25 - Sun, Aug 30

6:00 am - 1:26 pmMLI Moline Quad-City-PHL Philadelphia

6h 26m1 stop Atlanta Hartsfield-Jackson

12:10 pm - 4:25 pmPHL Philadelphia-MLI Moline Quad-City

5h 15m1 stop Atlanta Hartsfield-Jackson

$383Delta

Tue, Aug 25 - Sun, Aug 30

6:00 am - 3:05 pmMLI Moline Quad-City-PHL Philadelphia

8h 05m2 stops Chicago O'Hare Intl Washington, D.C. Reagan-National

7:37 pm - 12:08 amPHL Philadelphia-MLI Moline Quad-City

5h 31m1 stop Chicago O'Hare Intl

$388American Airlines

Fri, Aug 21 - Tue, Sep 1

11:08 am - 5:34 pmMLI Moline Quad-City-PHL Philadelphia

5h 26m1 stop Atlanta Hartsfield-Jackson

6:15 am - 10:25 amPHL Philadelphia-MLI Moline Quad-City

5h 10m1 stop Atlanta Hartsfield-Jackson

$394Delta

Sat, Aug 22 - Sat, Aug 29

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

2h 05mnonstop

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

2h 05mnonstop

$439Southwest

Sat, Aug 22 - Wed, Aug 26

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

1h 55mnonstop

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

2h 00mnonstop

$439Southwest

Tue, Aug 25 - Sat, Aug 29

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

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

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

2h 25mnonstop

$449United 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 12% 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

Willow Grove

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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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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