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.

$71 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

Thu, Aug 27 - Mon, Aug 31

6:17 pm - 7:15 am-

11h 58m

8:30 am - 5:22 pm-

9h 52m

$138Frontier

Mon, Sep 14 - Mon, Sep 21

2:29 pm - 11:18 pm-

7h 49m

8:41 am - 1:10 pm-

5h 29m

$139Frontier

Thu, Aug 20 - Mon, Aug 24

6:00 am - 9:17 am-

2h 17mnonstop

6:40 pm - 12:50 pm-

43h 10m

$177Multiple Airlines

Fri, Dec 4 - Mon, Dec 7

2:50 pm - 11:57 pm-

8h 07m

4:56 pm - 6:40 pm-

2h 44mnonstop

$190Multiple Airlines

Sat, Oct 17 - Wed, Oct 21

1:22 pm - 4:33 pm-

2h 11mnonstop

7:25 am - 9:00 am-

2h 35mnonstop

$257American Airlines

Wed, Sep 30 - Thu, Oct 1

5:48 pm - 9:10 pm-

2h 22mnonstop

10:20 pm - 11:56 pm-

2h 36mnonstop

$257American Airlines

Sat, Aug 29 - Sat, Sep 5

2:30 pm - 5:54 pm-

2h 24mnonstop

6:25 am - 7:50 am-

2h 25mnonstop

$257United Airlines

Tue, Dec 29 - Thu, Dec 31

6:15 pm - 9:29 pm-

2h 14mnonstop

6:26 am - 8:00 am-

2h 34mnonstop

$257United Airlines

Thu, Sep 3 - Sun, Sep 6

1:00 pm - 4:00 pm-

2h 00mnonstop

12:25 pm - 1:25 pm-

2h 00mnonstop

$257Southwest

Wed, Sep 2 - Sun, Sep 6

1:00 pm - 4:00 pm-

2h 00mnonstop

12:25 pm - 1:25 pm-

2h 00mnonstop

$257Southwest

Useful Info

Low season	January
High season	July
Cheapest flight	$71

Best time to beat the crowds with an average 8% drop in price.

Most popular time to fly with an average 15% 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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Philadelphia (PHL)

PHL

$71 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

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