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Cheap flights from Philadelphia to Illinois from $56

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 8/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Philadelphia to Illinois

Cheap round-trip flights

Frontier Logo
10:21 am - 11:58 amPHL-ORD
2h 37mnonstop
Frontier Logo
6:10 am - 9:25 amORD-PHL
2h 15mnonstop
$100Frontier
Find Deal
Sun, Sep 28 - Thu, Oct 2
Frontier Logo
10:21 am - 11:58 amPHL-ORD
2h 37mnonstop
Frontier Logo
6:10 am - 9:25 amORD-PHL
2h 15mnonstop
$101Frontier
Find Deal
Thu, Sep 4 - Sun, Sep 7
United Airlines Logo
5:15 pm - 6:37 pmPHL-ORD
2h 22mnonstop
United Airlines Logo
2:09 pm - 5:21 pmORD-PHL
2h 12mnonstop
$177United Airlines
Find Deal
Wed, Sep 3 - Thu, Sep 4
Southwest Logo
2:20 pm - 3:25 pmPHL-MDW
2h 05mnonstop
Southwest Logo
6:55 pm - 9:55 pmMDW-PHL
2h 00mnonstop
$177Southwest
Find Deal
Sat, Sep 20 - Mon, Sep 22
Delta Logo
7:00 am - 1:36 pmPHL-MDW
7h 36m1 stop
Delta Logo
6:17 pm - 11:22 pmMDW-PHL
4h 05m1 stop
$197Delta
Find Deal
Wed, Sep 3 - Sat, Sep 6
Southwest Logo
5:45 am - 6:55 amPHL-MDW
2h 10mnonstop
Southwest Logo
8:25 am - 4:35 pmMDW-PHL
7h 10m1 stop
$199Southwest
Find Deal
Thu, Nov 6 - Tue, Nov 11
American Airlines Logo
7:19 pm - 9:06 pmPHL-STL
2h 47mnonstop
American Airlines Logo
4:55 pm - 8:15 pmSTL-PHL
2h 20mnonstop
$216American Airlines
Find Deal
Thu, Sep 4 - Mon, Sep 8
American Airlines Logo
7:05 pm - 8:47 pmPHL-STL
2h 42mnonstop
American Airlines Logo
6:00 am - 9:18 amSTL-PHL
2h 18mnonstop
$217American Airlines
Find Deal
Wed, Aug 27 - Sat, Aug 30
Delta Logo
2:35 pm - 7:07 pmPHL-STL
5h 32m1 stop
Delta Logo
1:30 pm - 7:54 pmSTL-PHL
5h 24m1 stop
$237Delta
Find Deal
Sat, Aug 23 - Tue, Aug 26
United Airlines Logo
5:15 pm - 10:15 pmPHL-PIA
6h 00m1 stop
United Airlines Logo
5:19 pm - 12:21 amPIA-PHL
6h 02m1 stop
$324United Airlines
Find Deal
Fri, Sep 12 - Tue, Sep 16

Frontier flights from Philadelphia to Illinois

Our best Frontier deals on Philadelphia to Illinois flight tickets
Frontier
Sep 28
PHL10:21 amPhiladelphia
2h 37m
ORD11:58 amChicago O'Hare Intl
Oct 2
ORD6:10 amChicago O'Hare Intl
2h 15m
PHL9:25 amPhiladelphia
$100
Find similar
Frontier
Sep 4
PHL10:21 amPhiladelphia
2h 37m
ORD11:58 amChicago O'Hare Intl
Sep 7
ORD6:10 amChicago O'Hare Intl
2h 15m
PHL9:25 amPhiladelphia
$101
Find similar
Frontier
Oct 23
PHL10:21 amPhiladelphia
2h 31m
ORD11:52 amChicago O'Hare Intl
Oct 26
ORD6:20 amChicago O'Hare Intl
2h 06m
PHL9:26 amPhiladelphia
$111
Find similar

Spirit Airlines flights from Philadelphia to Illinois

Our best Spirit Airlines deals on Philadelphia to Illinois flight tickets
Spirit Airlines
Aug 25
PHL7:00 amPhiladelphia
7h 32m
1 stop
STL1:32 pmLambert-St Louis
Aug 28
STL2:30 pmLambert-St Louis
5h 19m
1 stop
PHL8:49 pmPhiladelphia
$146
Find similar
Spirit Airlines
Aug 22
PHL7:00 amPhiladelphia
7h 32m
1 stop
STL1:32 pmLambert-St Louis
Aug 24
STL2:30 pmLambert-St Louis
5h 19m
1 stop
PHL8:49 pmPhiladelphia
$147
Find similar
Spirit Airlines
Aug 15
PHL4:58 pmPhiladelphia
8h 01m
1 stop
ORD11:59 pmChicago O'Hare Intl
Aug 16
ORD8:12 pmChicago O'Hare Intl
12h 44m
1 stop
PHL9:56 amPhiladelphia
$163
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Philadelphia to Illinois 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 August 1, 2025.
Use the filters below to find and compare flights from Philadelphia to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Sun 9/28

10:21 am-11:58 am

Nonstop2h 37m

Chicago O'Hare Intl

Thu 10/2

6:10 am-9:25 am

Nonstop2h 15m

$100

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Thu 9/4

10:21 am-11:58 am

Nonstop2h 37m

Chicago O'Hare Intl

Sun 9/7

6:10 am-9:25 am

Nonstop2h 15m

$101

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Wed 9/3

5:15 pm-6:37 pm

Nonstop2h 22m

Chicago O'Hare Intl

Thu 9/4

2:09 pm-5:21 pm

Nonstop2h 12m

$177

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Sat 9/20

2:20 pm-3:25 pm

Nonstop2h 05m

Chicago Midway

Mon 9/22

6:55 pm-9:55 pm

Nonstop2h 00m

$177

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Wed 9/3

7:00 am-1:36 pm

1 stop7h 36m

Chicago Midway

Sat 9/6

6:17 pm-11:22 pm

1 stop4h 05m

$197

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Thu 11/6

5:45 am-6:55 am

Nonstop2h 10m

Chicago Midway

Tue 11/11

8:25 am-4:35 pm

1 stop7h 10m

$199

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 9/4

7:19 pm-9:06 pm

Nonstop2h 47m

Lambert-St Louis

Mon 9/8

4:55 pm-8:15 pm

Nonstop2h 20m

$216

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Wed 8/27

7:05 pm-8:47 pm

Nonstop2h 42m

Lambert-St Louis

Sat 8/30

6:00 am-9:18 am

Nonstop2h 18m

$217

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Sat 8/23

2:35 pm-7:07 pm

1 stop5h 32m

Lambert-St Louis

Tue 8/26

1:30 pm-7:54 pm

1 stop5h 24m

$237

PhiladelphiaPeoria

PHL - PIA

PHLPIA

Philadelphia

Fri 9/12

5:15 pm-10:15 pm

1 stop6h 00m

Greater Peoria

Tue 9/16

5:19 pm-12:21 am

1 stop6h 02m

$324

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 Illinois from

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

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Philadelphia is in September. Flight prices, which tend to average around $129, 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 September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $177.

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 $306. Flights from Philadelphia to Illinois on a Sunday will generally be more expensive and average around $458. 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 $229. Flights in the morning are often more expensive with an average ticket price of $383.

What is the cheapest Philadelphia to Illinois flight route?

Fly from Philadelphia to Chicago Midway for the best Philadelphia - Illinois flight prices

How far in advance should I book a flight 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 $274 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 $212 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?

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

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

$56

Fastest flight time

2h 05m

Direct flights

Mon, Tue, Thu, Fri, Sat and Sun

Airports in Illinois

3 airports
The best one-way flight to Illinois from Philadelphia in the past 72 hours is $56. The best round-trip flight deal from Philadelphia to Illinois found on momondo in the last 72 hours is $100.
The fastest flight from Philadelphia to Illinois takes 2h 05m
Direct flights go from Philadelphia to Illinois on Monday, Tuesday, Thursday, Friday, Saturday and Sunday. Airlines offering direct flights are: Southwest and Frontier.
There are 3 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Lambert-St Louis (STL)
Search flight deals

  • 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?

  • 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?

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
FrontierPriceFrom $52Free CancellationRating
5.8
3,241 reviews
Search Frontier flights
DeltaPriceFrom $118Free CancellationRating
8.0
7,983 reviews
Search Delta flights
United AirlinesPriceFrom $144Free CancellationRating
7.4
8,904 reviews
Search United Airlines flights
American AirlinesPriceFrom $157Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
SouthwestPriceFrom $163Free CancellationRating
8.0
4,246 reviews
Search Southwest 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.

An easier way to manage your Illinois trip

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