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$64+ Cheap flights from Philadelphia (PHL) 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 2/10. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
ene. 22 — ene. 291
jue. 1/22
jue. 1/29
1 adult, Economy
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Cheap flight deals from Philadelphia to Illinois

Cheapest flights from Philadelphia to Illinois
Explore the most affordable flight options available from Philadelphia to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on diciembre 23, 2025.

This Expedia deal was found by Cheapflights users on 12/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/316:36 pmPHL - ORD
Nonstop2h 30mFrontier
lun. 1/512:39 pmORD - PHL
1 stop11h 02mFrontier
Deal found 12/21$120
This Expedia deal was found by Cheapflights users on 12/22. 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.
mié. 12/316:36 pmPHL - ORD
Nonstop2h 30mFrontier
vie. 1/25:45 amORD - PHL
1 stop17h 41mFrontier
Deal found 12/22$145
This Super.com deal was found by Cheapflights users on 12/22. 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.
lun. 12/296:36 pmPHL - ORD
Nonstop2h 30mFrontier
mié. 12/312:15 pmORD - PHL
Nonstop2h 15mFrontier
Deal found 12/22$186
This Expedia deal was found by Cheapflights users on 12/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 12/306:00 amPHL - ORD
1 stop13h 52mFrontier
mié. 12/312:15 pmORD - PHL
Nonstop2h 15mFrontier
Deal found 12/21$190
This Kiwi.com deal was found by Cheapflights users on 12/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/316:36 pmPHL - ORD
Nonstop2h 30mMultiple Airlines
dom. 1/45:05 amORD - PHL
1 stop13h 04mMultiple Airlines
Deal found 12/21$195
This Frontier deal was found by Cheapflights users on 12/22. 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.
jue. 12/259:18 amPHL - ORD
1 stop10h 15mFrontier
jue. 1/83:32 pmORD - PHL
Nonstop2h 15mFrontier
Deal found 12/22$201
This Frontier deal was found by Cheapflights users on 12/21. 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.
mié. 12/315:15 amPHL - MDW
1 stop9h 06mFrontier
lun. 1/52:16 pmMDW - PHL
1 stop8h 27mFrontier
Deal found 12/21$213
This Kiwi.com deal was found by Cheapflights users on 12/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/316:00 amPHL - STL
2 stops28h 40mMultiple Airlines
lun. 1/125:11 pmSTL - PHL
1 stop27h 52mMultiple Airlines
Deal found 12/21$241
This Gotogate deal was found by Cheapflights users on 12/21. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 12/315:15 amPHL - MDW
1 stop9h 06mFrontier
dom. 1/410:50 pmMDW - PHL
1 stop29h 41mFrontier
Deal found 12/21$248
This CheapOair deal was found by Cheapflights users on 12/21. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 12/259:18 amPHL - MDW
1 stop9h 20mFrontier
dom. 1/410:50 pmMDW - PHL
1 stop29h 41mFrontier
Deal found 12/21$278
This Frontier deal was found by Cheapflights users on 12/21. 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.
sáb. 12/275:01 amPHL - MDW
1 stop9h 20mFrontier
mié. 2/187:00 amMDW - PHL
1 stop9h 32mFrontier
Deal found 12/21$282
This Frontier deal was found by Cheapflights users on 12/21. 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.
mié. 12/317:10 amPHL - STL
1 stop10h 14mFrontier
lun. 1/128:50 amSTL - PHL
1 stop10h 19mFrontier
Deal found 12/21$282

Find flight deals from Philadelphia to Illinois

Keep the following information in mind while searching for Philadelphia to Illinois flight deals. Data was last updated diciembre 23, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$99
(Kiwi.com)

One-way from

$64
(Expedia)

Popular in

February

Cheapest in

September

Average price

$277

Good round-trip deal

$285 or less

Good one-way deal

$186 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 Philadelphia to Illinois
Search Deals
One-way flight from Philadelphia to Illinois
Search Deals
Highest demand for flights based on searches. 12% potential increase in price ($37 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 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 Philadelphia to Illinois.
Search Deals
Price to beat on a one-way flight from Philadelphia to Illinois.
Search Deals

Cheapflights 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, Cheapflights users made 2,558,603 searches. Data last updated diciembre 23, 2025.
Use the filters below to find and compare flights from Philadelphia to Illinois that are best for you.

Fly from

Philadelphia

Fly to

Illinois

Route

Depart

Return

Price

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

mar. 1/20

6:20 pm-6:51 am

1 stop13h 31m

Lambert-St Louis

mar. 1/27

5:42 pm-10:37 am

1 stop15h 55m

$131

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

vie. 2/27

7:11 am-8:47 am

Nonstop2h 36m

Chicago O'Hare Intl

dom. 3/1

3:40 pm-12:53 am

1 stop8h 13m

$137

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

sáb. 1/24

10:10 am-11:38 am

Nonstop2h 28m

Chicago O'Hare Intl

mié. 1/28

2:30 pm-5:33 pm

Nonstop2h 03m

$139

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

lun. 1/19

5:50 pm-11:47 am

2 stops18h 57m

Chicago O'Hare Intl

vie. 1/23

8:43 pm-8:47 am

1 stop11h 04m

$146

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

vie. 1/9

1:59 pm-3:39 pm

Nonstop2h 40m

Chicago O'Hare Intl

dom. 1/11

3:32 pm-6:47 pm

Nonstop2h 15m

$148

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

sáb. 1/24

5:00 pm-6:30 pm

Nonstop2h 30m

Chicago O'Hare Intl

dom. 1/25

8:56 am-12:07 pm

Nonstop2h 11m

$158

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

mar. 1/20

2:36 pm-6:51 am

1 stop17h 15m

Lambert-St Louis

mar. 1/27

5:42 pm-3:40 pm

2 stops20h 58m

$158

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

dom. 2/1

10:45 pm-9:21 am

1 stop11h 36m

Lambert-St Louis

mié. 2/4

8:22 pm-4:49 pm

2 stops19h 27m

$160

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

jue. 1/22

11:09 am-11:33 pm

1 stop13h 24m

Lambert-St Louis

lun. 1/26

10:16 am-5:14 pm

1 stop5h 58m

$162

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

jue. 2/12

10:06 am-11:39 am

Nonstop2h 33m

Chicago O'Hare Intl

sáb. 2/14

6:08 pm-9:09 pm

Nonstop2h 01m

$169

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/22

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

Have a flexible travel schedule? Discover the best time to fly to Illinois from Philadelphia 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 Philadelphia to Illinois

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

Currently, December is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $48). Flying from Philadelphia to Illinois in July is currently the most expensive (average of $126). 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 PHL to IL?

Find hourly flight availability from Philadelphia 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 diciembre 23, 2025.

It’s optimal to fly from Philadelphia to Illinois in the evening. By choosing this option you can save up to 50% on the cost of your flight, compared to a flight at noon.

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

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

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

Weekly flight availability from Philadelphia to Illinois

Explore weekly flight availability from Philadelphia 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 diciembre 23, 2025.

The most flights from PHL to USIL are scheduled on a Monday (39 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (12 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 diciembre 23, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Philadelphia to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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
4,253 reviews
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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
8,014 reviews
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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
9,105 reviews
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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
11,054 reviews
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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
3,075 reviews
Southwest
8.0
Very good
4,253 reviews

Entertainment

7.5

Overall

8.0

Boarding

8.1

Food

7.0

Crew

8.6

Comfort

8.0

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 Philadelphia to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Philadelphia to Illinois?

    Philadelphia (PHL), located 7.0 mi from the city center, is the airport you fly out of when you book flights from Philadelphia to Illinois.

  • How long is the flight from Philadelphia to Illinois?

    Frontier, United Airlines, and Southwest can get you from Philadelphia to Illinois in just under 2h 28m. Your travel time can differ by up to 11h 03m. The distance from Philadelphia to Illinois is about 676 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $46. Users have also found prices from $70 and $76 on Southwest and United Airlines, respectively.

  • What are the most popular routes from Philadelphia to Illinois?

    While some choose either Philadelphia - Chicago Midway or Philadelphia - Lambert-St Louis, Philadelphia - Chicago O'Hare Intl is the most popular route from Philadelphia to Illinois.

  • What are the most reliable airlines from Philadelphia to Illinois?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Philadelphia to Illinois on time: ANA (80%), Japan Airlines (78%), Copa Airlines (75%).

  • What are the cheapest flights from Philadelphia to Illinois?

    The cheapest flight price from Philadelphia to Illinois is $71. On average you can expect to pay $1,128. The most popular route, (Philadelphia - Chicago O'Hare Intl), can usually be booked for $66.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Philadelphia 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 Philadelphia to Illinois?

    Currently, December is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $48). Flying from Philadelphia to Illinois in July is currently the most expensive (average of $126). 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 Philadelphia 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 Philadelphia to Illinois

Discover the top 6 airlines that operate flights from Philadelphia 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 diciembre 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$77Average$180FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$83Average$185FlexibilityNo cancel feeOn-time65%
DeltaCheapest$118Average$346FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$157Average$363FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$162Average$320FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$165Average$409FlexibilityNo cancel feeOn-time71%

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