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Cheap flights from Illinois to Philadelphia from $55

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Philadelphia departing on 12/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
10:00 am - 4:52 pmORD-PHL
5h 52m1 stop
Frontier Logo
12:33 pm - 2:03 pmPHL-ORD
2h 30mnonstop
$104Frontier
Find Deal
Tue, Dec 2 - Mon, Dec 8
Frontier Logo
10:00 am - 4:52 pmORD-PHL
5h 52m1 stop
Frontier Logo
12:33 pm - 2:03 pmPHL-ORD
2h 30mnonstop
$105Frontier
Find Deal
Tue, Dec 2 - Mon, Dec 8
Frontier Logo
2:26 pm - 12:40 amORD-PHL
9h 14m1 stop
Frontier Logo
12:33 pm - 2:03 pmPHL-ORD
2h 30mnonstop
$106Frontier
Find Deal
Sat, Dec 13 - Mon, Dec 15
Multiple Airlines Logo
2:00 pm - 5:15 pmORD-PHL
2h 15mnonstop
Multiple Airlines Logo
4:00 pm - 12:09 amPHL-ORD
9h 09m1 stop
$111Multiple Airlines
Find Deal
Fri, Dec 5 - Sat, Dec 6
Multiple Airlines Logo
10:00 am - 4:31 pmORD-PHL
5h 31m1 stop
Multiple Airlines Logo
4:00 pm - 12:09 amPHL-ORD
9h 09m1 stop
$112Multiple Airlines
Find Deal
Tue, Dec 9 - Sat, Dec 13
Spirit Airlines Logo
3:26 pm - 11:16 pmORD-PHL
6h 50m1 stop
Spirit Airlines Logo
4:00 pm - 12:09 amPHL-ORD
9h 09m1 stop
$113Spirit Airlines
Find Deal
Sat, Dec 6 - Sat, Dec 13
Southwest Logo
8:10 am - 11:05 amMDW-PHL
1h 55mnonstop
Southwest Logo
6:15 pm - 7:25 pmPHL-MDW
2h 10mnonstop
$139Southwest
Find Deal
Wed, Dec 17 - Wed, Dec 24
American Airlines Logo
6:50 am - 9:54 amORD-PHL
2h 04mnonstop
American Airlines Logo
12:33 pm - 2:04 pmPHL-ORD
2h 31mnonstop
$139American Airlines
Find Deal
Tue, Dec 9 - Sat, Dec 13
American Airlines Logo
5:00 am - 7:57 amORD-PHL
1h 57mnonstop
American Airlines Logo
9:25 pm - 10:56 pmPHL-ORD
2h 31mnonstop
$149American Airlines
Find Deal
Thu, Nov 27 - Tue, Dec 2
Southwest Logo
9:40 am - 12:35 pmMDW-PHL
1h 55mnonstop
Southwest Logo
12:10 pm - 9:50 pmPHL-MDW
10h 40m2 stops
$154Southwest
Find Deal
Sun, Feb 15 - Sat, Feb 21

Frontier flights from Illinois to Philadelphia

Our best Frontier deals on Illinois to Philadelphia flight tickets
Frontier
Dec 2
ORD10:00 amChicago O'Hare Intl
5h 52m
1 stop
PHL4:52 pmPhiladelphia
Dec 8
PHL12:33 pmPhiladelphia
2h 30m
ORD2:03 pmChicago O'Hare Intl
$104
Find similar
Frontier
Dec 2
ORD10:00 amChicago O'Hare Intl
5h 52m
1 stop
PHL4:52 pmPhiladelphia
Dec 8
PHL12:33 pmPhiladelphia
2h 30m
ORD2:03 pmChicago O'Hare Intl
$105
Find similar
Frontier
Dec 13
ORD2:26 pmChicago O'Hare Intl
9h 14m
1 stop
PHL12:40 amPhiladelphia
Dec 15
PHL12:33 pmPhiladelphia
2h 30m
ORD2:03 pmChicago O'Hare Intl
$106
Find similar

Spirit Airlines flights from Illinois to Philadelphia

Our best Spirit Airlines deals on Illinois to Philadelphia flight tickets
Spirit Airlines
Dec 6
ORD3:26 pmChicago O'Hare Intl
6h 50m
1 stop
PHL11:16 pmPhiladelphia
Dec 13
PHL4:00 pmPhiladelphia
9h 09m
1 stop
ORD12:09 amChicago O'Hare Intl
$113
Find similar
Spirit Airlines
Nov 20
STL10:53 amLambert-St Louis
12h 33m
2 stops
PHL12:26 amPhiladelphia
Nov 22
PHL6:00 amPhiladelphia
29h 03m
2 stops
STL10:03 amLambert-St Louis
$365
Find similar
Spirit Airlines
Nov 20
STL10:53 amLambert-St Louis
12h 33m
2 stops
PHL12:26 amPhiladelphia
Nov 22
PHL6:37 pmPhiladelphia
16h 26m
2 stops
STL10:03 amLambert-St Louis
$388
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to Philadelphia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated November 10, 2025.
Use the filters below to find and compare flights from Illinois to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 12/2

10:00 am-4:52 pm

1 stop5h 52m

Philadelphia

Mon 12/8

12:33 pm-2:03 pm

Nonstop2h 30m

$104

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 12/2

10:00 am-4:52 pm

1 stop5h 52m

Philadelphia

Mon 12/8

12:33 pm-2:03 pm

Nonstop2h 30m

$105

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Sat 12/13

2:26 pm-12:40 am

1 stop9h 14m

Philadelphia

Mon 12/15

12:33 pm-2:03 pm

Nonstop2h 30m

$106

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Fri 12/5

2:00 pm-5:15 pm

Nonstop2h 15m

Philadelphia

Sat 12/6

4:00 pm-12:09 am

1 stop9h 09m

$111

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 12/9

10:00 am-4:31 pm

1 stop5h 31m

Philadelphia

Sat 12/13

4:00 pm-12:09 am

1 stop9h 09m

$112

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Sat 12/6

3:26 pm-11:16 pm

1 stop6h 50m

Philadelphia

Sat 12/13

4:00 pm-12:09 am

1 stop9h 09m

$113

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Wed 12/17

8:10 am-11:05 am

Nonstop1h 55m

Philadelphia

Wed 12/24

6:15 pm-7:25 pm

Nonstop2h 10m

$139

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 12/9

6:50 am-9:54 am

Nonstop2h 04m

Philadelphia

Sat 12/13

12:33 pm-2:04 pm

Nonstop2h 31m

$139

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Thu 11/27

5:00 am-7:57 am

Nonstop1h 57m

Philadelphia

Tue 12/2

9:25 pm-10:56 pm

Nonstop2h 31m

$149

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Sun 2/15

9:40 am-12:35 pm

Nonstop1h 55m

Philadelphia

Sat 2/21

12:10 pm-9:50 pm

2 stops10h 40m

$154

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Philadelphia from

How to get the cheapest flight ticket from Illinois to Philadelphia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Philadelphia?

The cheapest month to fly to Philadelphia from Illinois is in October. Flight prices, which tend to average around $188, are often lower during this time because this is during the off-season. The month of August is another great option to travel to Philadelphia, with average flight prices from Illinois averaging around $215.

What is the cheapest day to depart on your flight to Philadelphia?

The cheapest day to depart from Illinois to Philadelphia is on a Thursday. Travelers who choose to depart for Philadelphia on a Thursday will often find tickets for as low as $269. On the other hand, Sunday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $388.

What is the cheapest time of day to depart on your flight to Philadelphia?

According to our data, the cheapest time of day to fly to Philadelphia is in the evening. momondo users have found flights departing from Illinois to Philadelphia in the evening for as low as $245. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. In contrast, the most expensive time of day to depart to Philadelphia is in the afternoon when prices are around $398.

What is the cheapest Illinois to Philadelphia flight route?

Fly from Chicago O'Hare Intl to Philadelphia for the best Illinois - Philadelphia flight prices

How far in advance should I book a flight to Philadelphia?

You are more likely to see cheaper flights to Philadelphia from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Philadelphia for around $280 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Philadelphia from Illinois for as low as $211 on momondo.

What cabin class options are available on Illinois to Philadelphia flights?

There are 4 cabin classes available to choose from on Illinois to Philadelphia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Philadelphia flights?

No. A direct flight is the cheapest option for a flight between Illinois to Philadelphia.

Cheap Illinois to Philadelphia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Philadelphia

Best Price Found

$88

Fastest flight time

1h 50m

Direct flights

Every day

Airports in Philadelphia

1 airport
The best one-way flight to Philadelphia from Illinois in the past 72 hours is $88. The best round-trip flight deal from Illinois to Philadelphia found on momondo in the last 72 hours is $123.
The fastest flight from Illinois to Philadelphia takes 1h 50m
Direct flights go from Illinois to Philadelphia every day.
There is 1 airport near Philadelphia: Philadelphia (PHL)
Search flight deals

  • When did momondo last update prices for flights from Illinois to Philadelphia Airport?

    Prices for flights from Illinois to Philadelphia Airport refresh daily.

  • How many operators does momondo search for flights from Illinois to Philadelphia Airport?

  • How old do you have to be to fly from Illinois to Philadelphia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Philadelphia Airport.

  • What documentation or ID do you need to fly to Philadelphia Airport?

    The required travel and health documents for your Philadelphia Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Philadelphia Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Illinois to Philadelphia?

Best airlines flying from Illinois to Philadelphia

Compare and see reviews for airlines that fly from Illinois to Philadelphia with momondo
Airline
Rating
Free Cancellation
Price
Spirit AirlinesPriceFrom $63Free CancellationRating
6.3
8,131 reviews
Search Spirit Airlines flights
FrontierPriceFrom $68Free CancellationRating
5.8
3,111 reviews
Search Frontier flights
DeltaPriceFrom $108Free CancellationRating
7.9
8,004 reviews
Search Delta flights
United AirlinesPriceFrom $149Free CancellationRating
7.4
9,011 reviews
Search United Airlines flights
American AirlinesPriceFrom $160Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
SouthwestPriceFrom $177Free CancellationRating
8.0
4,238 reviews
Search Southwest flights

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Wildwood
Cape May
Rehoboth Beach
Ocean City
Wildwood Crest
King of Prussia
Cherry Hill
Dewey Beach
Newark
Reading
North Wildwood
Dover
Avalon
Lewes
Stone Harbor
Essington
Vineland
Pottstown
New Castle
Somers Point

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Philadelphia?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Illinois to Philadelphia. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Illinois to Philadelphia with flexible booking policies on momondo?

momondo does allow users to show only those flights to Philadelphia from Illinois which offer a flexible booking policy as well as other useful filters and features.

How can momondo help me find flights from Illinois to Philadelphia?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Illinois to Philadelphia.

I’m not ready to book a flight from Illinois to Philadelphia right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Philadelphia, momondo offers a useful price alert feature which will track prices for flights to Philadelphia from Illinois and alert you when they change.

An easier way to manage your Philadelphia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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Wed 12/10
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