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

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

...and more

Travelers love KAYAK

41,299,237 searches in the past 7 days on KAYAK

Save 23% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals

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 - Fri, May 1

8:23 pm - 8:10 am

STL

PHL

10h 47m

1 stop

7:50 pm - 11:19 pm

PHL

STL

28h 29m

1 stop

$140Frontier

Sat, May 9 - Sat, May 16

4:19 pm - 12:44 am

STL

PHL

7h 25m

1 stop

4:07 pm - 12:21 am

PHL

STL

9h 14m

1 stop

$141Frontier

Wed, Apr 22 - Sun, Apr 26

4:59 pm - 11:40 am

STL

PHL

17h 41m

1 stop

5:01 am - 10:49 am

PHL

STL

6h 48m

1 stop

$151Frontier

Tue, Apr 14 - Tue, Apr 21

2:50 pm - 5:50 pm

MDW

PHL

2h 00mnonstop

11:35 am - 12:40 pm

PHL

MDW

2h 05mnonstop

$179Southwest

Wed, Apr 22 - Wed, Apr 29

8:00 am - 4:50 pm

MDW

PHL

7h 50m

2 stops

6:20 am - 11:35 am

PHL

MDW

6h 15m

1 stop

$184Southwest

Fri, Apr 24 - Sun, Apr 26

7:15 pm - 9:49 am

ORD

PHL

13h 34m

1 stop

6:15 am - 11:01 pm

PHL

ORD

17h 46m

1 stop

$186Multiple Airlines

Thu, Apr 16 - Sat, Apr 18

2:20 pm - 5:34 pm

ORD

PHL

2h 14mnonstop

6:12 pm - 12:24 am

PHL

ORD

7h 12m

1 stop

$187Multiple Airlines

Fri, May 1 - Sat, May 2

7:15 pm - 9:49 am

ORD

PHL

13h 34m

1 stop

6:12 pm - 10:23 am

PHL

ORD

17h 11m

2 stops

$188Spirit Airlines

Wed, Apr 22 - Wed, Apr 29

6:30 am - 12:17 pm

MLI

PHL

4h 47m

1 stop

6:55 pm - 11:02 pm

PHL

MLI

5h 07m

1 stop

$291United Airlines

Wed, Apr 15 - Wed, Apr 22

7:34 pm - 12:59 am

MLI

PHL

4h 25m

1 stop

10:00 am - 2:09 pm

PHL

MLI

5h 09m

1 stop

$315United Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$70

Best time to beat the crowds with an average 2% drop in price.

Most popular time to fly and prices are also 8% 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

Willow Grove

Pottstown

Kennett Square

Voorhees

Somers Point

Middletown

Wyomissing

Glen Mills

Phoenixville

Blackwood

Bird in Hand

Millville

Strasburg

Everything you need to know for your flight to Philadelphia

Airports

Cabin class

Complete your trip

Direct Flights

Flights to other cities

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