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Cheap flights from Philadelphia to Illinois from $70

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 5/26. 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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Find the cheapest flights from Philadelphia to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
5:06 pm - 6:44 pm
PHL
-
ORD
2h 38mnonstop
Frontier Logo
1:59 pm - 10:10 pm
ORD
-
PHL
7h 11m
1 stop
$184Frontier
Mon, May 11 - Thu, May 14
Frontier Logo
6:30 am - 11:09 am
PHL
-
MDW
5h 39m
1 stop
Frontier Logo
6:00 am - 12:25 pm
MDW
-
PHL
5h 25m
1 stop
$184Frontier
Fri, May 29 - Sat, May 30
American Airlines Logo
3:21 pm - 4:59 pm
PHL
-
STL
2h 38mnonstop
American Airlines Logo
11:18 am - 2:39 pm
STL
-
PHL
2h 21mnonstop
$257American Airlines
Tue, May 26 - Tue, Jun 2
Southwest Logo
6:35 pm - 8:00 pm
PHL
-
STL
2h 25mnonstop
Southwest Logo
2:30 pm - 10:00 pm
STL
-
PHL
6h 30m
1 stop
$267Southwest
Tue, May 26 - Tue, Jun 2
American Airlines Logo
5:18 am - 11:09 am
PHL
-
CMI
6h 51m
1 stop
American Airlines Logo
6:04 am - 11:29 am
CMI
-
PHL
4h 25m
1 stop
$270American Airlines
Wed, Jul 1 - Sat, Jul 4
Southwest Logo
1:45 pm - 8:00 pm
PHL
-
STL
7h 15m
2 stops
Southwest Logo
10:55 am - 2:05 pm
STL
-
PHL
2h 10mnonstop
$272Southwest
Wed, Aug 12 - Wed, Aug 19
Delta Logo
6:12 am - 9:29 am
PHL
-
STL
4h 17m
1 stop
Delta Logo
6:04 pm - 11:07 pm
STL
-
PHL
4h 03m
1 stop
$277Delta
Wed, May 20 - Wed, May 20
Delta Logo
5:30 am - 10:26 am
PHL
-
MLI
5h 56m
1 stop
Delta Logo
11:00 am - 6:27 pm
MLI
-
PHL
6h 27m
1 stop
$295Delta
Mon, Sep 21 - Sat, Sep 26
United Airlines Logo
9:21 am - 1:57 pm
PHL
-
PIA
5h 36m
1 stop
United Airlines Logo
5:30 am - 12:25 pm
PIA
-
PHL
5h 55m
1 stop
$309United Airlines
Wed, May 27 - Wed, Jun 3
United Airlines Logo
6:00 am - 12:50 pm
PHL
-
PAH
7h 50m
1 stop
United Airlines Logo
5:00 am - 12:25 pm
PAH
-
PHL
6h 25m
1 stop
$328United Airlines
Sun, May 24 - Sun, May 31

Frontier flights from Philadelphia to Illinois

Our best Frontier deals on Philadelphia to Illinois flight tickets
Frontier
May 11
PHL5:06 pmPhiladelphia
2h 38m
ORD6:44 pmChicago O'Hare Intl
May 14
ORD1:59 pmChicago O'Hare Intl
7h 11m
1 stop
PHL10:10 pmPhiladelphia
$184
Frontier
May 10
PHL5:13 pmPhiladelphia
2h 38m
ORD6:51 pmChicago O'Hare Intl
Jun 15
ORD7:52 pmChicago O'Hare Intl
2h 28m
PHL11:20 pmPhiladelphia
$185
Frontier
May 11
PHL5:06 pmPhiladelphia
2h 38m
ORD6:44 pmChicago O'Hare Intl
May 29
ORD6:55 amChicago O'Hare Intl
11h 19m
1 stop
PHL7:14 pmPhiladelphia
$186

American Airlines flights from Philadelphia to Illinois

Our best American Airlines deals on Philadelphia to Illinois flight tickets
American Airlines
May 26
PHL3:21 pmPhiladelphia
2h 38m
STL4:59 pmLambert-St Louis
Jun 2
STL11:18 amLambert-St Louis
2h 21m
PHL2:39 pmPhiladelphia
$257
American Airlines
Jul 1
PHL5:18 amPhiladelphia
6h 51m
1 stop
CMI11:09 amChampaign University-Willard
Jul 4
CMI6:04 amChampaign University-Willard
4h 25m
1 stop
PHL11:29 amPhiladelphia
$270
American Airlines
May 18
PHL5:42 pmPhiladelphia
2h 47m
STL7:29 pmLambert-St Louis
May 19
STL6:29 amLambert-St Louis
2h 16m
PHL9:45 amPhiladelphia
$274

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 April 29, 2026.
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

Cheapest round-trip

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Mon 5/11

5:06 pm-6:44 pm

Nonstop2h 38m

Chicago O'Hare Intl

Thu 5/14

1:59 pm-10:10 pm

1 stop7h 11m

$184

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Fri 5/29

6:30 am-11:09 am

1 stop5h 39m

Chicago Midway

Sat 5/30

6:00 am-12:25 pm

1 stop5h 25m

$184
Quickest round-trip

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 5/26

3:21 pm-4:59 pm

Nonstop2h 38m

Lambert-St Louis

Tue 6/2

11:18 am-2:39 pm

Nonstop2h 21m

$257

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Tue 5/26

6:35 pm-8:00 pm

Nonstop2h 25m

Lambert-St Louis

Tue 6/2

2:30 pm-10:00 pm

1 stop6h 30m

$267

PhiladelphiaChampaign

PHL - CMI

PHLCMI

Philadelphia

Wed 7/1

5:18 am-11:09 am

1 stop6h 51m

Champaign University-Willard

Sat 7/4

6:04 am-11:29 am

1 stop4h 25m

$270

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Wed 8/12

1:45 pm-8:00 pm

2 stops7h 15m

Lambert-St Louis

Wed 8/19

10:55 am-2:05 pm

Nonstop2h 10m

$272

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Wed 5/20

6:12 am-9:29 am

1 stop4h 17m

Lambert-St Louis

Wed 5/20

6:04 pm-11:07 pm

1 stop4h 03m

$277

PhiladelphiaMoline

PHL - MLI

PHLMLI

Philadelphia

Mon 9/21

5:30 am-10:26 am

1 stop5h 56m

Moline Quad-City

Sat 9/26

11:00 am-6:27 pm

1 stop6h 27m

$295

PhiladelphiaPeoria

PHL - PIA

PHLPIA

Philadelphia

Wed 5/27

9:21 am-1:57 pm

1 stop5h 36m

Greater Peoria

Wed 6/3

5:30 am-12:25 pm

1 stop5h 55m

$309

PhiladelphiaPaducah

PHL - PAH

PHLPAH

Philadelphia

Sun 5/24

6:00 am-12:50 pm

1 stop7h 50m

Paducah Barkley Regional

Sun 5/31

5:00 am-12:25 pm

1 stop6h 25m

$328

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 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 $219.

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 $311. Flights from Philadelphia to Illinois on a Sunday will generally be more expensive and average around $491. 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 $282. Flights at noon are often more expensive with an average ticket price of $416.

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 $286 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 $239 on momondo.

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

$160

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 $160. The best round-trip flight deal from Philadelphia to Illinois found on momondo in the last 72 hours is $304.
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).
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?

  • 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 $77Free CancellationRating
5.6
2,970 reviews
Search Frontier flights
DeltaPriceFrom $83Free CancellationRating
7.9
8,465 reviews
Search Delta flights
United AirlinesPriceFrom $156Free CancellationRating
7.4
9,680 reviews
Search United Airlines flights
SouthwestPriceFrom $158Free CancellationRating
8.0
4,314 reviews
Search Southwest flights
American AirlinesPriceFrom $163Free CancellationRating
7.1
11,678 reviews
Search American 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.

An easier way to manage your Illinois trip

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