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$69+ Cheap flights from Illinois to Philadelphia (PHL)

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 10/6. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — PHL
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Illinois to Philadelphia

Keep the following information in mind while searching for Illinois to Philadelphia flight deals. Data was last updated September 15, 2025.

Round-trip from

$120
(Trip.com)

One-way from

$69
(Cheapflightsfares)

Popular in

March

Cheapest in

October

Average price

$185

Good round-trip deal

$152 or less

Good one-way deal

$89 or less
From Illinois to Philadelphia
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One-way flight from Illinois to Philadelphia
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Highest demand for flights based on searches. 21% potential increase in price ($72 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Illinois to Philadelphia.
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Price to beat on a one-way flight from Illinois to Philadelphia.
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Find flight deals from Illinois to Philadelphia

Cheapest flights from Illinois to Philadelphia
Explore the most affordable flight options available from Illinois to Philadelphia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Trip.com deal was found by Cheapflights users on 9/12. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:24 pmMDW - PHL
1 stop9h 55mFrontier
Sun 10/266:10 amPHL - MDW
Nonstop2h 15mFrontier
Deal found 9/12$120
This Frontier deal was found by Cheapflights users on 9/13. 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.
Fri 10/1711:50 amORD - PHL
Nonstop2h 09mFrontier
Sun 10/196:00 amPHL - ORD
1 stop6h 18mFrontier
Deal found 9/13$120
This Frontier deal was found by Cheapflights users on 9/14. 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.
Fri 10/1711:50 amORD - PHL
Nonstop2h 09mFrontier
Fri 10/175:12 pmPHL - ORD
1 stop9h 19mFrontier
Deal found 9/14$121
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Fri 10/37:15 amMDW - PHL
1 stop8h 17mFrontier
Mon 10/66:00 amPHL - MDW
Nonstop2h 11mFrontier
Deal found 9/14$122
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 11/145:11 amORD - PHL
1 stop5h 18mFrontier
Mon 11/176:00 amPHL - ORD
Nonstop2h 26mFrontier
Deal found 9/14$122
This Priceline deal was found by Cheapflights users on 9/14. 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 10/38:15 amMDW - PHL
Nonstop2h 01mFrontier
Sun 10/56:00 amPHL - MDW
Nonstop2h 11mFrontier
Deal found 9/14$123
This Frontier deal was found by Cheapflights users on 9/14. 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.
Fri 10/1711:50 amORD - PHL
Nonstop2h 09mFrontier
Wed 10/2210:49 amPHL - ORD
1 stop6h 51mFrontier
Deal found 9/14$123
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 10/1012:13 pmMDW - PHL
Nonstop2h 00mFrontier
Mon 10/134:13 pmPHL - MDW
Nonstop2h 14mFrontier
Deal found 9/14$124
This Kiwi.com deal was found by Cheapflights users on 9/13. 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.
Fri 10/1011:51 amORD - PHL
Nonstop2h 09mFrontier
Sun 10/2610:02 pmPHL - ORD
1 stop10h 08mFrontier
Deal found 9/13$124
This Cheapflightsfares deal was found by Cheapflights users on 9/14. 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 10/175:28 pmMDW - PHL
1 stop6h 39mFrontier
Sun 10/196:10 amPHL - MDW
Nonstop2h 15mFrontier
Deal found 9/14$125
This Frontier deal was found by Cheapflights users on 9/14. 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.
Fri 10/1711:50 amORD - PHL
Nonstop2h 09mFrontier
Thu 10/234:10 pmPHL - ORD
Nonstop2h 30mFrontier
Deal found 9/14$125
This Frontier deal was found by Cheapflights users on 9/13. 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 11/69:15 amMDW - PHL
Nonstop2h 04mFrontier
Sun 11/94:47 pmPHL - MDW
1 stop8h 43mFrontier
Deal found 9/13$126

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Philadelphia 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 September 15, 2025.
Use the filters below to find and compare flights from Illinois to Philadelphia that are best for you.

Fly from

Illinois

Fly to

Philadelphia

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 10/10

6:05 pm-1:07 am

1 stop6h 02m

Philadelphia

Sun 10/12

5:05 am-12:46 pm

1 stop8h 41m

$143

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Mon 9/29

8:15 am-11:16 am

Nonstop2h 01m

Philadelphia

Wed 10/8

9:14 pm-9:47 am

1 stop13h 33m

$147

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Sat 10/11

5:35 pm-8:30 pm

Nonstop1h 55m

Philadelphia

Sat 10/25

5:10 pm-6:15 pm

Nonstop2h 05m

$149

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Thu 11/6

11:45 am-2:40 pm

Nonstop1h 55m

Philadelphia

Sat 11/8

5:35 pm-6:45 pm

Nonstop2h 10m

$158

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Fri 10/17

9:15 pm-12:10 am

Nonstop1h 55m

Philadelphia

Tue 10/21

6:05 pm-7:10 pm

Nonstop2h 05m

$158

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Thu 9/25

4:56 pm-12:57 am

1 stop7h 01m

Philadelphia

Mon 9/29

1:02 pm-11:20 pm

1 stop11h 18m

$162

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sat 10/11

7:15 pm-9:32 am

1 stop13h 17m

Philadelphia

Sat 10/18

5:33 am-6:10 pm

1 stop13h 37m

$177

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Mon 10/13

9:15 pm-12:10 am

Nonstop1h 55m

Philadelphia

Sat 10/18

6:00 am-7:05 am

Nonstop2h 05m

$178

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Sat 9/27

7:30 am-10:39 am

Nonstop2h 09m

Philadelphia

Sun 10/5

6:30 am-7:53 am

Nonstop2h 23m

$179

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 9/22

4:00 pm-12:57 am

1 stop7h 57m

Philadelphia

Sat 9/27

6:37 pm-3:04 pm

1 stop21h 27m

$179

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/13

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

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

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

Currently, August is the cheapest month in which you can book a flight from Illinois to Philadelphia (average of $236). Flying from Illinois to Philadelphia in March is currently the most expensive (average of $295). 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 IL to PHL?

Find hourly flight availability from Illinois to Philadelphia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

When flying from Illinois to Philadelphia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Illinois to Philadelphia

Explore weekly flight availability from Illinois to Philadelphia. 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 September 15, 2025.

The most flights from USIL to PHL are scheduled on a Monday (51 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (41 on average).

Related info for your journey

Find useful and relevant information for your journey from Illinois to Philadelphia. 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 into for flights to Philadelphia from Illinois?

    Philadelphia (PHL) is the airport you will fly into if you book a flight from Illinois to Philadelphia. It is only a 7.0 mi journey from Philadelphia (PHL) to Philadelphia’s city center.

  • How long is the flight from Illinois to Philadelphia?

    For as low as $149, Frontier can have you in Philadelphia from Illinois in 1h 55m. Airlines will cover a distance of 666 mi. This flight may include one or multiple stops.

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

    The cheapest airline one-way is Southwest, with whom users have recently found tickets for as low as $70. However, be on the lookout for offers from United Airlines and Frontier, as they are both options that can get you from Illinois to Philadelphia for a low price.

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

    Most travelers choose Chicago O'Hare Intl - Philadelphia, Chicago Midway - Philadelphia or Lambert-St Louis - Philadelphia when deciding on the best route from Illinois to Philadelphia.

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

    Consider Air Canada (82%), United Airlines (71%) or American Airlines (66%) when booking your flight. These represent the most reliable airlines when flying from Illinois to Philadelphia.

  • What are the cheapest flights from Illinois to Philadelphia?

    Looking for the cheapest flight from Illinois to Philadelphia? While on average our users pay $305, our data indicates the cheapest price to be $69. The most popular route (Chicago O'Hare Intl - Philadelphia), is priced around $83.

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

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

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from Illinois to Philadelphia (average of $236). Flying from Illinois to Philadelphia in March is currently the most expensive (average of $295). 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

Traveling to a place near Philadelphia?

Book flights to Philadelphia if you plan to visit one of these locations
Vineland
Wildwood
King of Prussia
Pottstown
Reading
Dewey Beach
Ephrata
Camden
Ocean City
Cherry Hill
Dover
Elkton
Essington
Willow Grove
Newark
Millville
Chester
Exton
Havre de Grace
Plymouth Meeting

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Illinois to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Illinois to Philadelphia

Discover the top 6 airlines that operate flights from Illinois to Philadelphia. 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$63Average$260FlexibilityNo cancel feeOn-time65%
FrontierCheapest$64Average$165FlexibilityNo cancel feeOn-time62%
DeltaCheapest$108Average$477FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$156Average$465FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$157Average$452FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$172Average$302FlexibilityNo cancel feeOn-time63%

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