$54+ 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 2/12. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Jan 17 — Jan 241
1 adult, Economy
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Pennsylvania to Illinois
Cheapest flights from Pennsylvania to IllinoisExplore 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 18, 2025.
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 18, 2025.
This CheapOair deal was found by Cheapflights users on 12/17. 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 CheapOair 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
Fri 1/95:53 pmORD - LGA
Nonstop2h 06mSpirit Airlines
Deal found 12/17![Spirit Airlines logo]()
$85
This Super.com deal was found by Cheapflights users on 12/17. 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
Tue 1/64:38 pmORD - LGA
Nonstop2h 04mSpirit Airlines
Deal found 12/17![Spirit Airlines logo]()
$96
This Frontier deal was found by Cheapflights users on 12/17. 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 12/3111:00 amJFK - ORD
Nonstop2h 57mFrontier
Fri 1/98:35 amORD - JFK
Nonstop2h 24mFrontier
Deal found 12/17![Frontier logo]()
$109
This Cheapflightsfares deal was found by Cheapflights users on 12/17. 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
Mon 2/912:44 pmORD - LGA
1 stop6h 16mSpirit Airlines
Deal found 12/17![Spirit Airlines logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
Wed 12/316:55 amEWR - ORD
Nonstop2h 36mSpirit Airlines
Tue 1/69:34 amORD - EWR
Nonstop2h 16mSpirit Airlines
Deal found 12/15![Spirit Airlines logo]()
$111
This Cheapflightsfares deal was found by Cheapflights users on 12/16. 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
Mon 1/54:38 pmORD - LGA
Nonstop2h 04mSpirit Airlines
Deal found 12/16![Spirit Airlines logo]()
$112
This CheapOair deal was found by Cheapflights users on 12/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:55 amEWR - ORD
Nonstop2h 36mSpirit Airlines
Fri 1/95:15 amORD - EWR
1 stop8h 55mSpirit Airlines
Deal found 12/17![Spirit Airlines logo]()
$113
This Priceline deal was found by Cheapflights users on 12/15. 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.
Wed 12/316:36 pmPHL - ORD
Nonstop2h 30mFrontier
Mon 1/512:39 pmORD - PHL
1 stop5h 52mFrontier
Deal found 12/15![Frontier logo]()
$120
This CheapOair deal was found by Cheapflights users on 12/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:55 amEWR - ORD
Nonstop2h 36mSpirit Airlines
Mon 1/59:34 amORD - EWR
Nonstop2h 16mSpirit Airlines
Deal found 12/17![Spirit Airlines logo]()
$121
This Expedia deal was found by Cheapflights users on 12/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/316:36 pmPHL - ORD
Nonstop2h 30mFrontier
Fri 1/25:45 amORD - PHL
1 stop17h 41mFrontier
Deal found 12/17![Frontier logo]()
$121
This Super.com deal was found by Cheapflights users on 12/16. 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 12/3111:00 amJFK - ORD
Nonstop2h 57mFrontier
Mon 1/56:40 amORD - JFK
Nonstop2h 24mFrontier
Deal found 12/16![Frontier logo]()
$122
This Kiwi.com deal was found by Cheapflights users on 12/15. 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.
Wed 12/316:55 amEWR - ORD
Nonstop2h 36mSpirit Airlines
Thu 1/88:43 pmORD - EWR
1 stop13h 59mSpirit Airlines
Deal found 12/15![Spirit Airlines logo]()
$123
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 18, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $84 (Frontier) |
One-way from | $54 (Trip.com) |
Popular in | February |
Cheapest in | September |
Average price | $275 |
Good round-trip deal | $227 or less |
Good one-way deal | $166 or less |
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 18, 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
LGA - ORD
LGAORD
New York LaGuardia
Mon 2/2
8:00 am-9:03 pm
1 stop14h 03m
Chicago O'Hare Intl
Tue 2/3
5:53 pm-8:59 pm
Nonstop2h 06m
$98
New YorkChicago
LGA - ORD
LGAORD
New York LaGuardia
Tue 1/13
12:59 pm-9:03 pm
1 stop9h 04m
Chicago O'Hare Intl
Tue 1/20
6:05 am-5:58 pm
1 stop10h 53m
$119
New YorkChicago
JFK - MDW
JFKMDW
New York John F Kennedy Intl
Tue 1/27
6:10 am-12:05 pm
1 stop6h 55m
Chicago Midway
Wed 1/28
1:20 pm-12:43 am
1 stop10h 23m
$128
New YorkChicago
JFK - ORD
JFKORD
New York John F Kennedy Intl
Tue 2/24
7:59 pm-9:57 pm
Nonstop2h 58m
Chicago O'Hare Intl
Thu 2/26
2:11 pm-5:43 pm
Nonstop2h 32m
$139
NewarkChicago
EWR - ORD
EWRORD
Newark
Wed 12/31
7:59 am-9:54 am
Nonstop2h 55m
Chicago O'Hare Intl
Wed 12/31
6:05 pm-9:21 pm
Nonstop2h 16m
$139
New YorkChicago
JFK - ORD
JFKORD
New York John F Kennedy Intl
Mon 2/2
7:35 pm-9:35 pm
Nonstop3h 00m
Chicago O'Hare Intl
Wed 2/4
6:25 pm-9:59 pm
Nonstop2h 34m
$139
New YorkChicago
LGA - ORD
LGAORD
New York LaGuardia
Sun 1/25
7:15 am-9:11 am
Nonstop2h 56m
Chicago O'Hare Intl
Thu 1/29
6:00 am-9:08 am
Nonstop2h 08m
$139
New YorkChicago
LGA - ORD
LGAORD
New York LaGuardia
Thu 1/22
6:05 am-7:58 am
Nonstop2h 53m
Chicago O'Hare Intl
Sun 1/25
7:10 am-10:41 am
Nonstop2h 31m
$139
New YorkChicago
LGA - ORD
LGAORD
New York LaGuardia
Thu 1/29
7:15 am-9:11 am
Nonstop2h 56m
Chicago O'Hare Intl
Sun 2/1
8:55 am-12:13 pm
Nonstop2h 18m
$139
NewarkSt. Louis
EWR - STL
EWRSTL
Newark
Thu 1/15
5:00 am-10:34 pm
1 stop18h 34m
Lambert-St Louis
Tue 1/20
5:42 pm-1:03 pm
1 stop18h 21m
$142
Showing 1-10 of 60 results
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 $58). 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 18, 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 29% 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.
How much does it cost to fly round-trip from Pennsylvania to Illinois?
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 18, 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.
Crew
8.6
Food
7.0
Overall
7.9
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Food
7.0
Overall
7.9
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Food
7.0
Overall
7.9
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Food
7.0
Overall
7.9
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Food
7.0
Overall
7.9
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Food
7.0
Overall
7.9
Comfort
8.0
Boarding
8.1
Entertainment
7.5
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
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.
Browse thousands of different options on Cheapflights for your next trip
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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.
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 18, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$77 | Average$180 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$83 | Average$185 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$91 | Average$370 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$97 | Average$317 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$105 | Average$376 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$118 | Average$423 | FlexibilityNo cancel fee | On-timeN/A |