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

The number of flights available between Philadelphia and Illinois is 52 per day as of June 2026. The most frequent departure time is 5:00PM, with 41% of daily flights leaving in the afternoon.

What airlines fly to Illinois?

United Airlines, American Airlines and Frontier are the top three most popular airlines that fly to Illinois from Philadelphia according to our data. United Airlines is the first choice among our users, with 47% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 6 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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

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

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

367 flights are operational weekly from Philadelphia to Illinois as of June 2026. The most popular departure day for this route is Thu, with 18% of flights per week taking off on this day.

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

Prices for flights from Philadelphia Airport to Illinois are updated daily.

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

The number of operators available for flights from Philadelphia Airport to Illinois is 5 as of June 2026.

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

The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Philadelphia Airport to Illinois.

What documentation or ID do you need to fly to Illinois?

The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$83 Cheap Flights from Philadelphia to Illinois in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Philadelphia to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:30 am - 5:37 pm

PHL

STL

10h 07m

1 stop

4:57 pm - 7:15 am

STL

PHL

13h 18m

1 stop

$177Frontier

Thu, Jul 30 - Mon, Aug 3

5:28 pm - 9:40 am

PHL

STL

17h 12m

1 stop

10:35 am - 6:15 pm

STL

PHL

6h 40m

1 stop

$179Frontier

Thu, Sep 24 - Sat, Oct 3

6:30 am - 8:57 am

PHL

STL

27h 27m

1 stop

6:34 pm - 12:22 pm

STL

PHL

16h 48m

1 stop

$180Frontier

Sun, Jul 26 - Tue, Aug 4

4:35 pm - 6:00 pm

PHL

MDW

2h 25mnonstop

3:40 pm - 6:40 pm

MDW

PHL

2h 00mnonstop

$247Southwest

Wed, Jul 1 - Sat, Jul 4

7:00 pm - 11:16 pm

PHL

MLI

5h 16m

1 stop

6:30 am - 2:47 pm

MLI

PHL

7h 17m

1 stop

$261United Airlines

Sat, Jul 25 - Sat, Aug 8

5:43 am - 11:11 am

PHL

CMI

6h 28m

1 stop

6:05 am - 11:31 am

CMI

PHL

4h 26m

1 stop

$270American Airlines

Tue, Aug 18 - Sat, Aug 22

6:00 am - 10:12 am

PHL

MLI

5h 12m

1 stop

11:08 am - 6:49 pm

MLI

PHL

6h 41m

1 stop

$285Delta

Sat, Jul 25 - Thu, Aug 6

1:25 pm - 8:09 pm

PHL

MLI

7h 44m

1 stop

5:05 pm - 12:59 am

MLI

PHL

6h 54m

1 stop

$300Delta

Sat, Jul 4 - Tue, Jul 7

5:40 pm - 12:11 am

PHL

MLI

7h 31m

1 stop

6:08 am - 2:38 pm

MLI

PHL

7h 30m

2 stops

$305American Airlines

Wed, Jul 1 - Wed, Jul 8

7:00 pm - 11:20 pm

PHL

PIA

5h 20m

1 stop

5:43 pm - 12:57 am

PIA

PHL

6h 14m

1 stop

$309United Airlines

Mon, Jul 6 - Sat, Aug 1

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Frontier flights from Philadelphia to Illinois

Our best Frontier deals on Philadelphia to Illinois flight tickets

Frontier

Jul 15

PHL4:30 pmPhiladelphia

26h 07m

1 stop

STL5:37 pmLambert-St Louis

Jul 20

STL4:57 pmLambert-St Louis

18h 25m

1 stop

PHL12:22 pmPhiladelphia

$171

Frontier

Jul 9

PHL8:30 amPhiladelphia

10h 07m

1 stop

STL5:37 pmLambert-St Louis

Jul 13

STL4:57 pmLambert-St Louis

13h 18m

1 stop

PHL7:15 amPhiladelphia

$177

Frontier

Sep 24

PHL5:28 pmPhiladelphia

17h 12m

1 stop

STL9:40 amLambert-St Louis

Oct 3

STL10:35 amLambert-St Louis

6h 40m

1 stop

PHL6:15 pmPhiladelphia

$179

Delta flights from Philadelphia to Illinois

Our best Delta deals on Philadelphia to Illinois flight tickets

Delta

Jun 30

PHL9:46 amPhiladelphia

4h 18m

1 stop

ORD1:04 pmChicago O'Hare Intl

Jul 4

ORD11:15 amChicago O'Hare Intl

4h 21m

1 stop

PHL4:36 pmPhiladelphia

$267

Delta

Jun 30

PHL6:10 amPhiladelphia

5h 40m

1 stop

ORD10:50 amChicago O'Hare Intl

Jul 3

ORD5:22 pmChicago O'Hare Intl

4h 55m

1 stop

PHL11:17 pmPhiladelphia

$277

Delta

Jun 30

PHL9:46 amPhiladelphia

4h 18m

1 stop

ORD1:04 pmChicago O'Hare Intl

Jul 8

ORD8:03 amChicago O'Hare Intl

8h 09m

1 stop

PHL5:12 pmPhiladelphia

$282

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 7/30

8:30 am-5:37 pm

1 stop10h 07m

Lambert-St Louis

Mon 8/3

4:57 pm-7:15 am

1 stop13h 18m

$177

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 9/24

5:28 pm-9:40 am

1 stop17h 12m

Lambert-St Louis

Sat 10/3

10:35 am-6:15 pm

1 stop6h 40m

$179

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Sun 7/26

6:30 am-8:57 am

1 stop27h 27m

Lambert-St Louis

Tue 8/4

6:34 pm-12:22 pm

1 stop16h 48m

$180

Quickest round-trip

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Wed 7/1

4:35 pm-6:00 pm

Nonstop2h 25m

Chicago Midway

Sat 7/4

3:40 pm-6:40 pm

Nonstop2h 00m

$247

PhiladelphiaMoline

PHL - MLI

PHLMLI

Philadelphia

Sat 7/25

7:00 pm-11:16 pm

1 stop5h 16m

Moline Quad-City

Sat 8/8

6:30 am-2:47 pm

1 stop7h 17m

$261

PhiladelphiaChampaign

PHL - CMI

PHLCMI

Philadelphia

Tue 8/18

5:43 am-11:11 am

1 stop6h 28m

Champaign University-Willard

Sat 8/22

6:05 am-11:31 am

1 stop4h 26m

$270

PhiladelphiaMoline

PHL - MLI

PHLMLI

Philadelphia

Sat 7/25

6:00 am-10:12 am

1 stop5h 12m

Moline Quad-City

Thu 8/6

11:08 am-6:49 pm

1 stop6h 41m

$285

PhiladelphiaMoline

PHL - MLI

PHLMLI

Philadelphia

Sat 7/4

1:25 pm-8:09 pm

1 stop7h 44m

Moline Quad-City

Tue 7/7

5:05 pm-12:59 am

1 stop6h 54m

$300

PhiladelphiaMoline

PHL - MLI

PHLMLI

Philadelphia

Wed 7/1

5:40 pm-12:11 am

1 stop7h 31m

Moline Quad-City

Wed 7/8

6:08 am-2:38 pm

2 stops7h 30m

$305

PhiladelphiaPeoria

PHL - PIA

PHLPIA

Philadelphia

Mon 7/6

7:00 pm-11:20 pm

1 stop5h 20m

Greater Peoria

Sat 8/1

5:43 pm-12:57 am

1 stop6h 14m

$309

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 Philadelphia to Illinois

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 Illinois?

The cheapest month to fly to Illinois from Philadelphia is in February. Flight prices, which tend to average around $40, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of February, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $216.

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

The cheapest day to depart from Philadelphia to Illinois is on a Friday when prices can be found for as low as $328. Flights from Philadelphia to Illinois on a Sunday will generally be more expensive and average around $494. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

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

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from Philadelphia to Illinois during this time can be as low as $302. Flights at noon are often more expensive with an average ticket price of $420.

What is the cheapest Philadelphia to Illinois flight route?

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

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

You are more likely to see cheaper flights to Illinois from Philadelphia when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $297 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Philadelphia for as low as $252 on momondo.

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

There are 4 cabin classes available to choose from on Philadelphia to Illinois 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 Philadelphia to Illinois flights?

You could potentially save up to 8% on your flight if you consider stops on a Philadelphia to Illinois flight.

Cheap Philadelphia to Illinois flight deals and tips

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

Best Price Found	$172
Fastest flight time	2h 00m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Philadelphia in the past 72 hours is $172. The best round-trip flight deal from Philadelphia to Illinois found on momondo in the last 72 hours is $321.

The fastest flight from Philadelphia to Illinois takes 2h 00m

Direct flights go from Philadelphia to Illinois every day.

There are 98 airports in Illinois. From Philadelphia there are direct flights to Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Lambert-St Louis (STL).

Search flight deals

Frequently asked questions about flying from Philadelphia to Illinois

When did momondo last update prices for flights from Philadelphia Airport to Illinois?
Prices for flights from Philadelphia Airport to Illinois are updated daily.
How many operators does momondo search for flights from Philadelphia Airport to Illinois?
The number of operators available for flights from Philadelphia Airport to Illinois is 5 as of June 2026.
How old do you have to be to fly from Philadelphia Airport to Illinois?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Philadelphia Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Philadelphia to Illinois?
momondo data reveals that the most frequently booked plane model on the route from Philadelphia to Illinois is Boeing 737-800, representing 23.23% of all bookings. The subsequent popular models are Boeing 737 MAX 8 at 15.94%, Airbus A319 at 9.50%, and Boeing 737-900 at 9.29%.

Best airlines flying from Philadelphia to Illinois

Compare and see reviews for airlines that fly from Philadelphia to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $77	Free Cancellation	Rating 5.6 2,880 reviews	Search Frontier flights
Delta	PriceFrom $83	Free Cancellation	Rating 7.8 8,410 reviews	Search Delta flights
Southwest	PriceFrom $158	Free Cancellation	Rating 7.9 4,237 reviews	Search Southwest flights
American Airlines	PriceFrom $161	Free Cancellation	Rating 7.1 11,686 reviews	Search American Airlines flights
United Airlines	PriceFrom $161	Free Cancellation	Rating 7.4 9,859 reviews	Search United Airlines flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Philadelphia to Illinois. momondo saves you time and could save you money on your trip.

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

All flight searches from Philadelphia to Illinois on momondo can be filtered to show those which offer flexible booking policies.

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

Once all potential Philadelphia to Illinois flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

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

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Popular cities in Illinois

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Flights to Dallasfrom $86

Cheap flights from Philadelphia to Illinois from $83

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Philadelphia to Illinois departing on 7/14. 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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Frontier flights from Philadelphia to Illinois

Our best Frontier deals on Philadelphia to Illinois flight tickets

Delta flights from Philadelphia to Illinois

Our best Delta deals on Philadelphia to Illinois flight tickets

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How to get the cheapest flight ticket from Philadelphia to Illinois

What is the cheapest month to fly to Illinois?

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

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

What is the cheapest Philadelphia to Illinois flight route?

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

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

Can stopping save me money on Philadelphia to Illinois flights?

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

What airlines fly to Illinois?

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

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

Cheap Philadelphia to Illinois flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Illinois

Frequently asked questions about flying from Philadelphia to Illinois

Best airlines flying from Philadelphia to Illinois

Compare and see reviews for airlines that fly from Philadelphia to Illinois with momondo

Why use momondo?

An easier way to manage your Illinois 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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Illinois

Popular cities in Illinois

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