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$70+ Cheap flights from Pennsylvania to Illinois

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/22. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Aug 26 — Sep 21
Tue 8/26
Tue 9/2
1 adult, Economy
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Cheap flight deals from Pennsylvania to Illinois

Keep the following information in mind while searching for Pennsylvania to Illinois flight deals. Data was last updated August 21, 2025.

Round-trip from

$125
(Frontier)

One-way from

$70
(American Airlines)

Popular in

March

Cheapest in

September

Average price

$194

Good round-trip deal

$170 or less

Good one-way deal

$109 or less
From Pennsylvania to Illinois
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One-way flight from Pennsylvania to Illinois
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Highest demand for flights based on searches. 20% potential increase in price ($62 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Pennsylvania to Illinois.
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Price to beat on a one-way flight from Pennsylvania to Illinois.
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Find flight deals from Pennsylvania to Illinois

Cheapest flights from Pennsylvania to Illinois
Explore the most affordable flight options available from Pennsylvania to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 21, 2025.

This Frontier deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/105:45 pmPHL - ORD
Nonstop2h 27mFrontier
Mon 11/178:26 amORD - PHL
Nonstop2h 13mFrontier
Deal found 8/21$125
This Mytrip deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/174:04 pmPHL - ORD
Nonstop2h 30mFrontier
Sun 10/196:00 amORD - PHL
1 stop27h 25mFrontier
Deal found 8/21$126
This Cheapflightsfares deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/3110:47 amPHL - ORD
Nonstop2h 33mFrontier
Sun 9/76:10 amORD - PHL
Nonstop2h 15mFrontier
Deal found 8/19$127
This Frontier deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/3110:47 amPHL - ORD
Nonstop2h 33mFrontier
Fri 9/126:10 amORD - PHL
Nonstop2h 15mFrontier
Deal found 8/19$128
This Cheapflightsfares deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/310:21 amPHL - ORD
Nonstop2h 37mFrontier
Sun 10/56:10 amORD - PHL
Nonstop2h 15mFrontier
Deal found 8/19$130
This Frontier deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2512:18 pmPHL - ORD
1 stop5h 39mFrontier
Sun 9/146:10 amORD - PHL
Nonstop2h 15mFrontier
Deal found 8/18$131
This Priceline deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/127:08 pmPHL - ORD
1 stop6h 02mFrontier
Fri 9/196:10 amORD - PHL
Nonstop2h 15mFrontier
Deal found 8/19$133
This Mytrip deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/43:55 pmPHL - ORD
1 stop16h 15mFrontier
Thu 10/96:50 pmORD - PHL
Nonstop2h 20mFrontier
Deal found 8/21$134
This Mytrip deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1510:21 amPHL - ORD
Nonstop2h 37mFrontier
Fri 9/196:10 amORD - PHL
Nonstop2h 15mFrontier
Deal found 8/19$135
This Frontier deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/161:01 pmJFK - ORD
1 stop11h 38mFrontier
Fri 10/176:40 amORD - JFK
Nonstop2h 23mFrontier
Deal found 8/21$136
This Kiwi.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/810:21 amPHL - ORD
Nonstop2h 37mFrontier
Thu 9/186:10 amORD - PHL
Nonstop2h 15mFrontier
Deal found 8/18$136
This Cheapflightsfares deal was found by Cheapflights users on 8/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/176:30 amLGA - ORD
1 stop10h 42mSpirit Airlines
Sun 9/2110:27 amORD - LGA
1 stop11h 36mSpirit Airlines
Deal found 8/21$136

Cheapflights Fare Finder

 
Customize your flight search to find flights from Pennsylvania 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, Cheapflights users made 2,558,603 searches. Data last updated August 21, 2025.
Use the filters below to find and compare flights from Pennsylvania to Illinois that are best for you.

Fly from

Pennsylvania

Fly to

Illinois

Route

Depart

Return

Price

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Fri 11/7

5:45 pm-7:12 pm

Nonstop2h 27m

Chicago O'Hare Intl

Sun 11/9

1:55 pm-10:08 am

1 stop19h 13m

$126

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Fri 10/24

4:10 pm-5:40 pm

Nonstop2h 30m

Chicago O'Hare Intl

Sun 10/26

2:41 pm-9:30 pm

1 stop5h 49m

$126

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Fri 9/5

10:16 pm-3:17 pm

1 stop18h 01m

Chicago O'Hare Intl

Fri 9/12

6:10 am-9:25 am

Nonstop2h 15m

$126

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Fri 10/17

4:04 pm-5:34 pm

Nonstop2h 30m

Chicago O'Hare Intl

Sun 10/19

6:00 am-10:25 am

1 stop27h 25m

$126

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Thu 9/18

12:01 pm-4:51 pm

1 stop5h 50m

Chicago O'Hare Intl

Thu 9/25

6:10 am-9:25 am

Nonstop2h 15m

$126

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Sun 8/31

10:47 am-12:20 pm

Nonstop2h 33m

Chicago O'Hare Intl

Sun 9/14

6:10 am-9:25 am

Nonstop2h 15m

$128

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Fri 9/12

10:21 am-11:58 am

Nonstop2h 37m

Chicago O'Hare Intl

Sun 9/14

6:10 am-9:25 am

Nonstop2h 15m

$128

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Sat 10/11

2:38 pm-4:05 pm

Nonstop2h 27m

Chicago O'Hare Intl

Sat 10/11

7:09 pm-10:25 pm

Nonstop2h 16m

$134

New YorkChicago

JFK - ORD

JFKORD

New York John F Kennedy Intl

Thu 10/16

3:29 pm-5:22 pm

Nonstop2h 53m

Chicago O'Hare Intl

Wed 10/22

7:00 am-10:25 am

Nonstop2h 25m

$137

New YorkChicago

JFK - ORD

JFKORD

New York John F Kennedy Intl

Sat 10/4

10:30 am-12:16 pm

Nonstop2h 46m

Chicago O'Hare Intl

Tue 10/7

7:00 am-10:25 am

Nonstop2h 25m

$137

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

Showing 1-10 of 60 results
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Best time to book a flight from Pennsylvania to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Pennsylvania with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Pennsylvania to Illinois

What is the cheapest month to book a flight from Pennsylvania to Illinois?

Currently, August is the cheapest month in which you can book a flight from Pennsylvania to Illinois (average of $245). Flying from Pennsylvania to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from PA to IL?

Find hourly flight availability from Pennsylvania to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 21, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Pennsylvania to Illinois as you normally would.

Weekly flight availability from Pennsylvania to Illinois

Explore weekly flight availability from Pennsylvania to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated August 21, 2025.

The most flights from USPA to USIL are scheduled on a Thursday (49 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (36 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated August 21, 2025.
Get a feel of what it's like to fly with Southwest, Delta, and United Airlines from Pennsylvania to Illinois by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,245 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,981 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,930 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,207 reviews
Southwest
8.0
Very good
4,245 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Comfort

8.0

Boarding

8.1

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

Related info for your journey

Find useful and relevant information for your journey from Pennsylvania to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Pennsylvania to Illinois?

    Frontier, Delta, and Spirit Airlines can get you from Pennsylvania to Illinois in just under 2h 27m. Your travel time can differ by up to 4h 16m. There are 676 mi between Pennsylvania and Illinois. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from Pennsylvania to Illinois one-way?

    The cheapest airlines for a one-way flight from Pennsylvania to Illinois are United Airlines ($70), American Airlines ($70), and Frontier ($77).

  • Can I find deals for flights from Pennsylvania to Illinois that include hotel bookings?

    Yes. In addition to deals on Pennsylvania to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Pennsylvania to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Pennsylvania to Illinois.

  • Can I find deals for business class flights from Pennsylvania to Illinois?

    Yes. Cheapflights offers flight deals from Pennsylvania to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Pennsylvania to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Pennsylvania to Illinois (average of $245). Flying from Pennsylvania to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Pennsylvania to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Pennsylvania to Illinois

Discover the top 5 airlines that operate flights from Pennsylvania to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 21, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$56Average$156FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$95Average$400FlexibilityNo cancel feeOn-time71%
DeltaCheapest$118Average$360FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$123Average$383FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$124Average$303FlexibilityNo cancel feeOn-time63%

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