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.

$60 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

Tue, Sep 8 - Thu, Sep 17

1:59 pm - 10:33 pm

ORD

PHL

7h 34m

1 stop

11:05 am - 12:41 pm

PHL

ORD

2h 36mnonstop

$182Frontier

Thu, Aug 13 - Mon, Aug 17

8:52 pm - 12:15 am

ORD

PHL

2h 23mnonstop

1:32 pm - 7:53 pm

PHL

ORD

7h 21m

1 stop

$183Frontier

Mon, Aug 24 - Mon, Aug 31

8:00 am - 11:10 am

MDW

PHL

2h 10mnonstop

5:25 pm - 11:20 pm

PHL

MDW

6h 55m

1 stop

$193Southwest

Sat, Aug 15 - Sat, Aug 15

6:30 am - 9:38 am

ORD

PHL

2h 08mnonstop

7:40 pm - 11:40 pm

PHL

ORD

5h 00m

1 stop

$193United Airlines

Wed, Oct 14 - Sat, Oct 17

8:05 am - 6:00 pm

MDW

PHL

8h 55m

2 stops

7:55 am - 9:00 am

PHL

MDW

2h 05mnonstop

$198Southwest

Thu, Aug 13 - Mon, Aug 17

10:54 am - 5:34 pm

MDW

PHL

5h 40m

1 stop

6:15 am - 9:59 am

PHL

MDW

4h 44m

1 stop

$202Delta

Tue, Oct 13 - Wed, Oct 14

9:29 am - 4:35 pm

MDW

PHL

6h 06m

1 stop

9:40 am - 12:48 pm

PHL

MDW

4h 08m

1 stop

$203Delta

Wed, Oct 21 - Wed, Oct 28

6:32 am - 2:43 pm

MLI

PHL

7h 11m

1 stop

6:25 am - 9:52 am

PHL

MLI

4h 27m

1 stop

$261United Airlines

Tue, Aug 11 - Sat, Aug 15

5:42 pm - 9:03 pm

STL

PHL

2h 21mnonstop

3:28 pm - 5:01 pm

PHL

STL

2h 33mnonstop

$277American Airlines

Tue, Aug 11 - Sat, Aug 15

6:00 am - 2:52 pm

STL

PHL

7h 52m

1 stop

3:28 pm - 5:01 pm

PHL

STL

2h 33mnonstop

$279American Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$60

Best time to beat the crowds with an average 12% drop in price.

Most popular time to fly with an average 4% 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.

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

$60 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

FAQs for booking flights from Illinois to 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