What is the cheapest airline that flies from Illinois to Philadelphia?

Southwest, Spirit Airlines, and Delta are the most popular carriers operating from Illinois to Philadelphia

How many flights depart from Illinois to Philadelphia on average per week?

As of March 2026, 202 flights take off from Illinois and land in Philadelphia each week. The most common flight departure day for this route is Tue, with 26% of weekly flights taking off on this day.

How long does it take to fly to Philadelphia?

If you’re flying from a popular airport in Illinois, such as Chicago or Peoria, and flying into Philadelphia, then you can expect flight times to average 3h 16m and 5h 07m, respectively.

What airlines fly to Philadelphia?

United Airlines, American Airlines and Spirit Airlines are the top three most popular airlines that fly to Philadelphia from Illinois according to our data. United Airlines is the first choice among our users, with 40% of people opting to fly with this airline when traveling to Philadelphia. Keep in mind that there are 7 different airlines that fly to Philadelphia on a routine basis, so you have a few additional options to choose from.

How many flights depart from Illinois to Philadelphia on average per day?

As of March 2026, there are 28 flights per day flying from Illinois to Philadelphia. The most common time of day flights depart is 6:00PM, with 36% of flights taking off in the afternoon.

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?

As of March 2026, there are 5 operators available to choose from 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.

$72 Cheap Flights from Illinois to Philadelphia in 2026

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Find the cheapest flights from Illinois to Philadelphia

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:20 pm - 5:34 pm

ORD

PHL

2h 14mnonstop

9:29 am - 11:03 am

PHL

ORD

2h 34mnonstop

$131Frontier

Mon, Apr 20 - Thu, Apr 23

5:10 am - 8:24 am

ORD

PHL

2h 14mnonstop

6:29 pm - 8:03 pm

PHL

ORD

2h 34mnonstop

$132Frontier

Thu, Apr 30 - Mon, May 4

2:20 pm - 5:34 pm

ORD

PHL

2h 14mnonstop

10:38 pm - 10:23 am

PHL

ORD

12h 45m

2 stops

$136Multiple Airlines

Thu, Apr 16 - Mon, Apr 20

2:20 pm - 5:34 pm

ORD

PHL

2h 14mnonstop

10:38 pm - 10:23 am

PHL

ORD

12h 45m

2 stops

$139Multiple Airlines

Fri, Apr 17 - Mon, Apr 20

6:35 am - 12:14 pm

MLI

PHL

4h 39m

1 stop

6:10 am - 10:04 am

PHL

MLI

4h 54m

1 stop

$260United Airlines

Wed, May 6 - Sun, May 10

5:35 pm - 12:59 am

PIA

PHL

6h 24m

1 stop

6:17 am - 10:02 am

PHL

PIA

4h 45m

1 stop

$269United Airlines

Wed, Apr 8 - Sat, Apr 11

2:56 pm - 9:54 pm

BMI

PHL

5h 58m

1 stop

3:50 pm - 9:51 pm

PHL

BMI

7h 01m

1 stop

$269American Airlines

Thu, Mar 26 - Wed, Apr 1

5:17 pm - 12:57 am

MLI

PHL

6h 40m

1 stop

5:17 am - 10:20 am

PHL

MLI

6h 03m

1 stop

$269Delta

Wed, May 27 - Thu, Jun 4

6:25 am - 12:54 pm

PIA

PHL

5h 29m

1 stop

7:14 am - 12:18 pm

PHL

PIA

6h 04m

1 stop

$279American Airlines

Tue, Mar 17 - Sat, Mar 21

5:17 pm - 12:57 am

MLI

PHL

6h 40m

1 stop

5:17 am - 10:20 am

PHL

MLI

6h 03m

1 stop

$319Delta

Tue, May 26 - Mon, Jun 1

Frontier flights from Illinois to Philadelphia

Our best Frontier deals on Illinois to Philadelphia flight tickets

Frontier

Apr 20

ORD2:20 pmChicago O'Hare Intl

2h 14m

PHL5:34 pmPhiladelphia

Apr 23

PHL9:29 amPhiladelphia

2h 34m

ORD11:03 amChicago O'Hare Intl

$131

Frontier

Apr 30

ORD5:10 amChicago O'Hare Intl

2h 14m

PHL8:24 amPhiladelphia

May 4

PHL6:29 pmPhiladelphia

2h 34m

ORD8:03 pmChicago O'Hare Intl

$132

Frontier

May 12

ORD4:28 pmChicago O'Hare Intl

7h 26m

1 stop

PHL12:54 amPhiladelphia

May 15

PHL6:34 pmPhiladelphia

2h 34m

ORD8:08 pmChicago O'Hare Intl

$133

United Airlines flights from Illinois to Philadelphia

Our best United Airlines deals on Illinois to Philadelphia flight tickets

United Airlines

Apr 14

ORD2:20 pmChicago O'Hare Intl

2h 13m

PHL5:33 pmPhiladelphia

Apr 17

PHL6:17 amPhiladelphia

2h 28m

ORD7:45 amChicago O'Hare Intl

$175

United Airlines

Apr 24

ORD9:55 pmChicago O'Hare Intl

2h 04m

PHL12:59 amPhiladelphia

Apr 26

PHL6:04 amPhiladelphia

2h 28m

ORD7:32 amChicago O'Hare Intl

$177

United Airlines

May 6

MLI6:35 amMoline Quad-City

4h 39m

1 stop

PHL12:14 pmPhiladelphia

May 10

PHL6:10 amPhiladelphia

4h 54m

1 stop

MLI10:04 amMoline Quad-City

$260

Fly from

Fly to

Route

Depart

Return

Price

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Mon 4/20

2:20 pm-5:34 pm

Nonstop2h 14m

Philadelphia

Thu 4/23

9:29 am-11:03 am

Nonstop2h 34m

$131

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Thu 4/30

5:10 am-8:24 am

Nonstop2h 14m

Philadelphia

Mon 5/4

6:29 pm-8:03 pm

Nonstop2h 34m

$132

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Thu 4/16

2:20 pm-5:34 pm

Nonstop2h 14m

Philadelphia

Mon 4/20

10:38 pm-10:23 am

2 stops12h 45m

$136

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Fri 4/17

2:20 pm-5:34 pm

Nonstop2h 14m

Philadelphia

Mon 4/20

10:38 pm-10:23 am

2 stops12h 45m

$139

MolinePhiladelphia

MLI - PHL

MLIPHL

Moline Quad-City

Wed 5/6

6:35 am-12:14 pm

1 stop4h 39m

Philadelphia

Sun 5/10

6:10 am-10:04 am

1 stop4h 54m

$260

PeoriaPhiladelphia

PIA - PHL

PIAPHL

Greater Peoria

Wed 4/8

5:35 pm-12:59 am

1 stop6h 24m

Philadelphia

Sat 4/11

6:17 am-10:02 am

1 stop4h 45m

$269

BloomingtonPhiladelphia

BMI - PHL

BMIPHL

Bloomington-Normal

Thu 3/26

2:56 pm-9:54 pm

1 stop5h 58m

Philadelphia

Wed 4/1

3:50 pm-9:51 pm

1 stop7h 01m

$269

MolinePhiladelphia

MLI - PHL

MLIPHL

Moline Quad-City

Wed 5/27

5:17 pm-12:57 am

1 stop6h 40m

Philadelphia

Thu 6/4

5:17 am-10:20 am

1 stop6h 03m

$269

PeoriaPhiladelphia

PIA - PHL

PIAPHL

Greater Peoria

Tue 3/17

6:25 am-12:54 pm

1 stop5h 29m

Philadelphia

Sat 3/21

7:14 am-12:18 pm

1 stop6h 04m

$279

MolinePhiladelphia

MLI - PHL

MLIPHL

Moline Quad-City

Tue 5/26

5:17 pm-12:57 am

1 stop6h 40m

Philadelphia

Mon 6/1

5:17 am-10:20 am

1 stop6h 03m

$319

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

Other information

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 January is another great option to travel to Philadelphia, with average flight prices from Illinois averaging around $200.

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

The cheapest day to depart from Illinois to Philadelphia is on a Friday. Travelers who choose to depart for Philadelphia on a Friday will often find tickets for as low as $261. 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 $375.

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 $253. 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 $342.

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 $277 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 $212 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	$169
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 $169. The best round-trip flight deal from Illinois to Philadelphia found on momondo in the last 72 hours is $290.

The fastest flight from Illinois to Philadelphia takes 1h 50m

Direct flights go from Illinois to Philadelphia every day.

There is 1 airport in Philadelphia. From Illinois there are direct flights to 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?
As of March 2026, there are 5 operators available to choose from 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?
Based on momondo bookings for flights between Illinois and Philadelphia, the leading plane model is Boeing 737-800, making up 26.17% of the total bookings. Other popular models include Airbus A319 with 13.37%, Boeing 737 MAX 8 with 13.22%, and Boeing 737-900 with 9.81%.

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 Airlines	PriceFrom $63	Free Cancellation	Rating 6.3 8,491 reviews	Search Spirit Airlines flights
Frontier	PriceFrom $67	Free Cancellation	Rating 5.7 3,041 reviews	Search Frontier flights
United Airlines	PriceFrom $148	Free Cancellation	Rating 7.4 9,378 reviews	Search United Airlines flights
American Airlines	PriceFrom $157	Free Cancellation	Rating 7.1 11,375 reviews	Search American Airlines flights
Southwest	PriceFrom $167	Free Cancellation	Rating 8.0 4,301 reviews	Search Southwest flights

Wildwood

Cape May

Rehoboth Beach

Wildwood Crest

Ocean City

Cherry Hill

King of Prussia

Newark

Dewey Beach

Reading

North Wildwood

Avalon

Dover

Lewes

Stone Harbor

Essington

Vineland

New Castle

Pottstown

Elkton

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.