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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

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. Visit our flight page for the latest deals!>/a>

$70 CHEAP FLIGHTS from Illinois to Philadelphia

PHL

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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

Fri, Apr 24 - Sun, Apr 26

8:23 pm - 8:10 am

STL

PHL

10h 47m

1 stop

5:01 am - 10:49 am

PHL

STL

6h 48m

1 stop

$140Frontier

Wed, Apr 22 - Thu, Apr 23

4:59 pm - 7:41 am

STL

PHL

13h 42m

1 stop

10:38 pm - 11:19 pm

PHL

STL

25h 41m

1 stop

$141Frontier

Thu, Apr 30 - Sun, May 3

11:21 am - 9:57 pm

STL

PHL

9h 36m

1 stop

7:00 am - 6:50 am

PHL

STL

24h 50m

1 stop

$165Multiple Airlines

Thu, Apr 16 - Mon, Apr 20

11:28 am - 9:57 pm

ORD

PHL

9h 29m

1 stop

6:29 pm - 8:03 pm

PHL

ORD

2h 34mnonstop

$183Multiple Airlines

Sat, May 30 - Tue, Jun 2

1:18 pm - 11:58 pm

ORD

PHL

9h 40m

1 stop

6:45 am - 11:15 pm

PHL

ORD

17h 30m

1 stop

$186Spirit Airlines

Fri, Apr 17 - Mon, Apr 20

11:28 am - 9:57 pm

ORD

PHL

9h 29m

1 stop

6:12 pm - 10:23 am

PHL

ORD

17h 11m

2 stops

$187Spirit Airlines

Tue, May 5 - Tue, May 12

5:11 pm - 12:59 am

MLI

PHL

6h 48m

1 stop

4:06 pm - 10:21 pm

PHL

MLI

7h 15m

1 stop

$261Delta

Wed, Jun 3 - Wed, Jun 10

9:49 am - 5:42 pm

CMI

PHL

6h 53m

1 stop

8:05 am - 12:50 pm

PHL

CMI

5h 45m

1 stop

$270United Airlines

Mon, May 4 - Tue, May 12

5:11 pm - 12:59 am

MLI

PHL

6h 48m

1 stop

5:15 pm - 10:21 pm

PHL

MLI

6h 06m

1 stop

$295Delta

Fri, May 15 - Mon, May 18

7:05 pm - 12:59 am

MLI

PHL

4h 54m

1 stop

8:30 pm - 12:07 am

PHL

MLI

4h 37m

1 stop

$338United Airlines

Useful Info

Low season	January
High season	May
Cheapest flight	$70

Best time to beat the crowds with an average 3% drop in price.

Most popular time to fly and prices are also 3% lower on average.

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

North Wildwood

Vineland

Essington

West Chester

Elkton

Pottstown

Willow Grove

Kennett Square

Voorhees

Somers Point

Middletown

Wyomissing

Glen Mills

Phoenixville

Blackwood

Millville

Bird in Hand

Strasburg

Everything you need to know for your flight to Philadelphia

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Complete your trip

Direct Flights

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Origins

Other airports

Return flight deals

Information on the airport you'll fly into in Philadelphia

Philadelphia (PHL)

PHL

$70 Find Cheap Flights from Illinois to Philadelphia

KAYAK searches hundreds of travel sites at once for deals on flights to Philadelphia

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

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.

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