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Cheap flights from Philadelphia to Illinois from $66

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
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Philadelphia to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
8:30 am - 5:22 pm-
9h 52m
Frontier Logo
6:17 pm - 7:15 am-
11h 58m
$132Frontier
Mon, Aug 31 - Mon, Sep 7
Frontier Logo
8:41 am - 1:10 pm-
5h 29m
Frontier Logo
2:29 pm - 11:18 pm-
7h 49m
$140Frontier
Mon, Sep 28 - Mon, Oct 5
Multiple Airlines Logo
4:47 pm - 6:24 pm-
2h 37mnonstop
Multiple Airlines Logo
2:35 pm - 11:44 pm-
8h 09m
$190Multiple Airlines
Thu, Oct 15 - Sun, Oct 18
Multiple Airlines Logo
7:00 am - 1:45 pm-
7h 45m
Multiple Airlines Logo
7:25 am - 10:49 am-
2h 24mnonstop
$190Multiple Airlines
Sun, Sep 20 - Sun, Sep 27
American Airlines Logo
8:49 pm - 10:29 pm-
2h 40mnonstop
American Airlines Logo
8:29 am - 11:42 am-
2h 13mnonstop
$257American Airlines
Tue, Sep 29 - Mon, Oct 5
American Airlines Logo
10:10 pm - 11:44 pm-
2h 34mnonstop
American Airlines Logo
8:49 pm - 11:59 pm-
2h 10mnonstop
$257American Airlines
Sat, Aug 22 - Mon, Aug 24
United Airlines Logo
1:30 pm - 2:55 pm-
2h 25mnonstop
United Airlines Logo
9:05 am - 12:23 pm-
2h 18mnonstop
$257United Airlines
Sat, Aug 29 - Wed, Sep 2
United Airlines Logo
1:24 pm - 2:50 pm-
2h 26mnonstop
United Airlines Logo
9:07 am - 12:25 pm-
2h 18mnonstop
$257United Airlines
Thu, Oct 15 - Sat, Oct 17
Southwest Logo
6:25 pm - 7:30 pm-
2h 05mnonstop
Southwest Logo
3:00 pm - 6:00 pm-
2h 00mnonstop
$257Southwest
Tue, Aug 25 - Wed, Aug 26
Southwest Logo
10:20 am - 11:25 am-
2h 05mnonstop
Southwest Logo
9:30 am - 12:25 pm-
1h 55mnonstop
$257Southwest
Mon, Aug 24 - Thu, Aug 27

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Frontier flights from Philadelphia to Illinois

Our best Frontier deals on Philadelphia to Illinois flight tickets
Frontier
Aug 31
PHL8:30 amPhiladelphia
9h 52m
1 stop
STL5:22 pmLambert-St Louis
Sep 7
STL6:17 pmLambert-St Louis
11h 58m
1 stop
PHL7:15 amPhiladelphia
$132
Frontier
Sep 28
PHL8:41 amPhiladelphia
5h 29m
1 stop
STL1:10 pmLambert-St Louis
Oct 5
STL2:29 pmLambert-St Louis
7h 49m
1 stop
PHL11:18 pmPhiladelphia
$140
Frontier
Sep 2
PHL4:45 pmPhiladelphia
25h 37m
1 stop
STL5:22 pmLambert-St Louis
Sep 7
STL6:17 pmLambert-St Louis
11h 58m
1 stop
PHL7:15 amPhiladelphia
$142

Southwest flights from Philadelphia to Illinois

Our best Southwest deals on Philadelphia to Illinois flight tickets
Southwest
Aug 5
PHL7:55 amPhiladelphia
2h 00m
MDW8:55 amChicago Midway
Sep 6
MDW8:40 amChicago Midway
2h 05m
PHL11:45 amPhiladelphia
$348
Southwest
Aug 15
PHL11:55 amPhiladelphia
5h 10m
1 stop
MDW4:05 pmChicago Midway
Aug 20
MDW9:30 amChicago Midway
1h 55m
PHL12:25 pmPhiladelphia
$358
Southwest
Aug 12
PHL1:45 pmPhiladelphia
2h 05m
MDW2:50 pmChicago Midway
Sep 8
MDW8:30 amChicago Midway
2h 05m
PHL11:35 amPhiladelphia
$359

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 4, 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

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Mon 8/31

8:30 am-5:22 pm

1 stop9h 52m

Lambert-St Louis

Mon 9/7

6:17 pm-7:15 am

1 stop11h 58m

$132

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Mon 9/28

8:41 am-1:10 pm

1 stop5h 29m

Lambert-St Louis

Mon 10/5

2:29 pm-11:18 pm

1 stop7h 49m

$140

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Thu 10/15

4:47 pm-6:24 pm

Nonstop2h 37m

Chicago O'Hare Intl

Sun 10/18

2:35 pm-11:44 pm

1 stop8h 09m

$190

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Sun 9/20

7:00 am-1:45 pm

1 stop7h 45m

Chicago O'Hare Intl

Sun 9/27

7:25 am-10:49 am

Nonstop2h 24m

$190

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Tue 9/29

8:49 pm-10:29 pm

Nonstop2h 40m

Chicago O'Hare Intl

Mon 10/5

8:29 am-11:42 am

Nonstop2h 13m

$257

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Sat 8/22

10:10 pm-11:44 pm

Nonstop2h 34m

Chicago O'Hare Intl

Mon 8/24

8:49 pm-11:59 pm

Nonstop2h 10m

$257

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Sat 8/29

1:30 pm-2:55 pm

Nonstop2h 25m

Chicago O'Hare Intl

Wed 9/2

9:05 am-12:23 pm

Nonstop2h 18m

$257

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Thu 10/15

1:24 pm-2:50 pm

Nonstop2h 26m

Chicago O'Hare Intl

Sat 10/17

9:07 am-12:25 pm

Nonstop2h 18m

$257

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Tue 8/25

6:25 pm-7:30 pm

Nonstop2h 05m

Chicago Midway

Wed 8/26

3:00 pm-6:00 pm

Nonstop2h 00m

$257
Quickest round-trip

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Mon 8/24

10:20 am-11:25 am

Nonstop2h 05m

Chicago Midway

Thu 8/27

9:30 am-12:25 pm

Nonstop1h 55m

$257

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 November. Flight prices, which tend to average around $233, 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 November, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $238.

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 $349. Flights from Philadelphia to Illinois on a Sunday will generally be more expensive and average around $497. 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 afternoon. Flights from Philadelphia to Illinois during this time can be as low as $344. 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 $304 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 $266 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

$161

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 $161. The best round-trip flight deal from Philadelphia to Illinois found on momondo in the last 72 hours is $275.
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?

  • 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 $74Free CancellationRating
5.6
2,738 reviews
Search Frontier flights
DeltaPriceFrom $133Free CancellationRating
7.8
8,483 reviews
Search Delta flights
United AirlinesPriceFrom $174Free CancellationRating
7.4
10,059 reviews
Search United Airlines flights
American AirlinesPriceFrom $174Free CancellationRating
7.1
11,846 reviews
Search American Airlines flights
SouthwestPriceFrom $175Free CancellationRating
8.0
4,222 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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