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$51+ 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 3/10. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Jan 8 — Jan 151
Thu 1/8
Thu 1/15
1 adult, Economy
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Cheap 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 December 9, 2025.

This Super.com deal was found by Cheapflights users on 12/7. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/318:37 pmLGA - ORD
Nonstop2h 30mSpirit Airlines
Mon 1/54:38 pmORD - LGA
Nonstop2h 04mSpirit Airlines
Deal found 12/7$84
This Frontier deal was found by Cheapflights users on 12/8. 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.
Wed 12/171:00 pmJFK - ORD
Nonstop2h 57mFrontier
Wed 1/78:35 amORD - JFK
Nonstop2h 24mFrontier
Deal found 12/8$89
This Super.com deal was found by Cheapflights users on 12/8. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/171:00 pmJFK - ORD
Nonstop2h 57mFrontier
Mon 12/226:40 amORD - JFK
Nonstop2h 24mFrontier
Deal found 12/8$90
This Frontier deal was found by Cheapflights users on 12/7. 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.
Wed 12/171:00 pmJFK - ORD
Nonstop2h 57mFrontier
Fri 12/196:40 amORD - JFK
Nonstop2h 24mFrontier
Deal found 12/7$91
This Frontier deal was found by Cheapflights users on 12/7. 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 12/151:00 pmJFK - ORD
Nonstop2h 57mFrontier
Fri 12/196:40 amORD - JFK
Nonstop2h 24mFrontier
Deal found 12/7$97
This Cheapflightsfares deal was found by Cheapflights users on 12/9. 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 12/318:37 pmLGA - ORD
Nonstop2h 30mSpirit Airlines
Wed 1/712:09 pmORD - LGA
1 stop8h 54mSpirit Airlines
Deal found 12/9$98
This Cheapflightsfares deal was found by Cheapflights users on 12/7. 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.
Tue 12/168:41 pmLGA - ORD
Nonstop2h 30mSpirit Airlines
Sat 1/37:20 amORD - LGA
Nonstop2h 01mSpirit Airlines
Deal found 12/7$99
This Cheapflightsfares deal was found by Cheapflights users on 12/8. 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 12/318:37 pmLGA - ORD
Nonstop2h 30mSpirit Airlines
Sat 1/37:20 amORD - LGA
Nonstop2h 01mSpirit Airlines
Deal found 12/8$100
This Cheapflightsfares deal was found by Cheapflights users on 12/8. 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.
Tue 12/168:41 pmLGA - ORD
Nonstop2h 30mSpirit Airlines
Wed 12/174:38 pmORD - LGA
Nonstop2h 04mSpirit Airlines
Deal found 12/8$101
This Super.com deal was found by Cheapflights users on 12/8. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/131:00 pmJFK - ORD
Nonstop2h 57mFrontier
Sat 1/1712:00 pmORD - JFK
Nonstop2h 24mFrontier
Deal found 12/8$102
This Kiwi.com deal was found by Cheapflights users on 12/7. 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.
Sat 12/131:00 pmJFK - ORD
Nonstop2h 57mFrontier
Tue 1/135:57 pmORD - JFK
1 stop6h 16mFrontier
Deal found 12/7$106
This Frontier deal was found by Cheapflights users on 12/7. 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.
Sat 12/131:00 pmJFK - ORD
Nonstop2h 57mFrontier
Wed 12/178:36 amORD - JFK
Nonstop2h 24mFrontier
Deal found 12/7$108

Find flight deals from Pennsylvania to Illinois

Keep the following information in mind while searching for Pennsylvania to Illinois flight deals. Data was last updated December 9, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$83
(Kiwi.com)

One-way from

$51
(CheapOair)

Popular in

February

Cheapest in

September

Average price

$269

Good round-trip deal

$192 or less

Good one-way deal

$168 or less
Provider with most accurate pricing for Philadelphia-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Chicago (CHI) flights.
Search Deals
From Pennsylvania to Illinois
Search Deals
One-way flight from Pennsylvania to Illinois
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($58 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Pennsylvania to Illinois.
Search Deals
Price to beat on a one-way flight from Pennsylvania to Illinois.
Search Deals

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 December 9, 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

New YorkChicago

JFK - MDW

JFKMDW

New York John F Kennedy Intl

Thu 2/5

6:10 am-11:45 am

1 stop6h 35m

Chicago Midway

Mon 2/9

5:01 pm-1:03 am

1 stop7h 02m

$129

New YorkChicago

JFK - ORD

JFKORD

New York John F Kennedy Intl

Sat 2/7

12:00 pm-1:50 pm

Nonstop2h 50m

Chicago O'Hare Intl

Sat 2/14

10:36 am-2:00 pm

Nonstop2h 24m

$139

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Wed 1/7

10:10 am-11:57 am

Nonstop2h 47m

Chicago O'Hare Intl

Fri 1/9

12:10 pm-3:23 pm

Nonstop2h 13m

$139

New YorkChicago

JFK - ORD

JFKORD

New York John F Kennedy Intl

Tue 1/13

7:35 pm-9:35 pm

Nonstop3h 00m

Chicago O'Hare Intl

Wed 1/14

10:29 am-1:54 pm

Nonstop2h 25m

$139

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Thu 1/8

4:25 pm-6:13 pm

Nonstop2h 48m

Chicago O'Hare Intl

Thu 1/15

1:00 pm-4:13 pm

Nonstop2h 13m

$139

New YorkChicago

JFK - ORD

JFKORD

New York John F Kennedy Intl

Thu 1/15

11:20 am-1:14 pm

Nonstop2h 54m

Chicago O'Hare Intl

Mon 1/19

7:01 am-10:30 am

Nonstop2h 29m

$139

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Thu 1/8

6:15 am-8:03 am

Nonstop2h 48m

Chicago O'Hare Intl

Sat 1/10

11:00 am-2:18 pm

Nonstop2h 18m

$139

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Tue 1/13

2:30 pm-4:22 pm

Nonstop2h 52m

Chicago O'Hare Intl

Sun 1/18

10:45 am-1:58 pm

Nonstop2h 13m

$139

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Fri 1/9

8:40 pm-10:34 pm

Nonstop2h 54m

Chicago O'Hare Intl

Sat 1/10

7:00 am-10:31 am

Nonstop2h 31m

$139

New YorkChicago

LGA - ORD

LGAORD

New York LaGuardia

Sat 1/17

6:05 am-7:58 am

Nonstop2h 53m

Chicago O'Hare Intl

Sun 1/18

10:45 am-1:58 pm

Nonstop2h 13m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/9

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, December is the cheapest month in which you can book a flight from Pennsylvania to Illinois (average of $56). Flying from Pennsylvania to Illinois in February is currently the most expensive (average of $148). 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 December 9, 2025.

When flying from Pennsylvania to Illinois, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 30% versus a flight at noon.

What is the cheapest day to fly from Pennsylvania to Illinois?

Use this chart to determine the cheapest time to fly round-trip from Pennsylvania to Illinois. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Pennsylvania to Illinois flight should consider departing on Friday mornings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 9, 2025.

The most flights from USPA to USIL are scheduled on a Monday (38 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (24 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 December 9, 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
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,254 reviews
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,011 reviews
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,089 reviews
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,045 reviews
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,085 reviews
Southwest
8.0
Very good
4,254 reviews

Boarding

8.1

Crew

8.6

Comfort

8.0

Food

7.0

Overall

8.0

Entertainment

7.5

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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 United Airlines can get you from Pennsylvania to Illinois in just under 2h 47m. Your travel time can differ by up to 3h 48m. There are 731 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 Southwest ($38), Frontier ($46), and American Airlines ($48).

  • 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, December is the cheapest month in which you can book a flight from Pennsylvania to Illinois (average of $56). Flying from Pennsylvania to Illinois in February is currently the most expensive (average of $148). 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 6 airlines flying from Pennsylvania to Illinois

Discover the top 6 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 December 9, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$77Average$180FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$83Average$185FlexibilityNo cancel feeOn-time65%
American AirlinesCheapest$92Average$370FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$97Average$318FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$106Average$386FlexibilityNo cancel feeOn-time69%
DeltaCheapest$118Average$423FlexibilityNo cancel feeOn-timeN/A

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