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$57+ 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 1/23. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — PHL
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
1 adult, Economy
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Cheap 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 December 16, 2025.

This Frontier deal was found by Cheapflights users on 12/14. 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.
Wed 12/242:15 pmORD - PHL
Nonstop2h 15mFrontier
Wed 12/316:36 pmPHL - ORD
Nonstop2h 30mFrontier
Deal found 12/14$113
This Frontier deal was found by Cheapflights users on 12/13. 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.
Wed 12/242:15 pmORD - PHL
Nonstop2h 15mFrontier
Thu 1/16:30 amPHL - ORD
1 stop5h 10mFrontier
Deal found 12/13$121
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/265:15 amORD - PHL
Nonstop2h 15mFrontier
Wed 12/316:36 pmPHL - ORD
Nonstop2h 30mFrontier
Deal found 12/15$131
This Southwest deal was found by Cheapflights users on 12/13. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/252:25 pmMDW - PHL
Nonstop1h 50mSouthwest
Wed 12/316:15 pmPHL - MDW
Nonstop2h 10mSouthwest
Deal found 12/13$139
This United Airlines deal was found by Cheapflights users on 12/13. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/256:15 pmORD - PHL
Nonstop2h 16mUnited Airlines
Wed 12/316:35 amPHL - ORD
Nonstop2h 28mUnited Airlines
Deal found 12/13$139
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/255:25 amORD - PHL
1 stop10h 31mFrontier
Wed 12/316:36 pmPHL - ORD
Nonstop2h 30mFrontier
Deal found 12/16$145
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:15 pmORD - PHL
Nonstop2h 15mFrontier
Thu 1/812:42 pmPHL - ORD
Nonstop2h 40mFrontier
Deal found 12/16$154
This Frontier deal was found by Cheapflights users on 12/14. 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.
Wed 12/242:15 pmORD - PHL
Nonstop2h 15mFrontier
Tue 12/306:30 amPHL - ORD
1 stop6h 35mFrontier
Deal found 12/14$155
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:50 amORD - PHL
1 stop14h 21mFrontier
Thu 1/812:42 pmPHL - ORD
Nonstop2h 40mFrontier
Deal found 12/16$159
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/312:15 pmORD - PHL
Nonstop2h 15mMultiple Airlines
Wed 1/78:00 amPHL - ORD
1 stop25h 18mMultiple Airlines
Deal found 12/16$160
This Orbitz 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/242:16 pmMDW - PHL
1 stop8h 27mFrontier
Tue 12/3010:00 pmPHL - MDW
1 stop24h 58mFrontier
Deal found 12/15$162
This Delta deal was found by Cheapflights users on 12/13. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/246:08 pmMDW - PHL
1 stop4h 09mDelta
Thu 1/16:00 amPHL - MDW
1 stop3h 49mDelta
Deal found 12/13$177

Find flight deals from Illinois to Philadelphia

Keep the following information in mind while searching for Illinois to Philadelphia flight deals. Data was last updated December 16, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$113
(Kiwi.com)

One-way from

$57
(Super.com)

Popular in

March

Cheapest in

October

Average price

$253

Good round-trip deal

$192 or less

Good one-way deal

$144 or less
Provider with most accurate pricing for Chicago (CHI)-Philadelphia flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Philadelphia flights.
Search Deals
From Illinois to Philadelphia
Search Deals
One-way flight from Illinois to Philadelphia
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($59 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 Illinois to Philadelphia.
Search Deals
Price to beat on a one-way flight from Illinois to Philadelphia.
Search Deals

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 December 16, 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

Mon 1/12

5:11 pm-5:43 pm

1 stop23h 32m

Philadelphia

Thu 1/15

8:43 pm-7:54 am

1 stop12h 11m

$137

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Wed 1/14

11:20 am-2:31 pm

Nonstop2h 11m

Philadelphia

Sun 1/18

6:30 am-7:59 am

Nonstop2h 29m

$139

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Mon 2/2

8:29 am-6:23 pm

1 stop8h 54m

Philadelphia

Fri 2/6

1:30 pm-5:44 pm

1 stop5h 14m

$151

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Fri 1/23

10:00 am-12:55 pm

Nonstop1h 55m

Philadelphia

Tue 1/27

12:15 pm-1:30 pm

Nonstop2h 15m

$158

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Thu 1/15

9:40 am-12:35 pm

Nonstop1h 55m

Philadelphia

Sun 1/18

5:40 am-7:00 am

Nonstop2h 20m

$158

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Sun 1/18

2:30 pm-5:34 pm

Nonstop2h 04m

Philadelphia

Thu 1/22

1:10 pm-2:40 pm

Nonstop2h 30m

$158

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Wed 1/21

11:20 am-2:31 pm

Nonstop2h 11m

Philadelphia

Mon 1/26

10:10 am-11:38 am

Nonstop2h 28m

$158

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 1/6

6:20 pm-9:36 pm

Nonstop2h 16m

Philadelphia

Sat 1/10

5:00 pm-6:30 pm

Nonstop2h 30m

$159

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Thu 1/15

8:43 pm-8:47 am

1 stop11h 04m

Philadelphia

Sun 1/18

8:20 am-9:03 pm

1 stop13h 43m

$163

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Mon 1/5

4:27 pm-2:38 pm

1 stop21h 11m

Philadelphia

Thu 1/8

3:56 pm-10:33 pm

1 stop7h 37m

$168

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/15

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, January is the cheapest month in which you can book a flight from Illinois to Philadelphia (average of $36). Flying from Illinois to Philadelphia in July is currently the most expensive (average of $104). 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 December 16, 2025.

When flying from Illinois to Philadelphia, 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 42% versus a flight in the afternoon.

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

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

Travelers seeking maximum savings on their Illinois to Philadelphia flight should consider departing on Monday afternoons 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.

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 $158, United Airlines 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 Frontier, with whom users have recently found tickets for as low as $49. However, be on the lookout for offers from Spirit Airlines and Southwest, 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 (86%), Malaysia Airlines (79%) or Cathay Pacific (76%) 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 $522, our data indicates the cheapest price to be $46. The most popular route (Chicago O'Hare Intl - Philadelphia), is priced around $87.

  • 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, January is the cheapest month in which you can book a flight from Illinois to Philadelphia (average of $36). Flying from Illinois to Philadelphia in July is currently the most expensive (average of $104). 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
Wildwood
Pottstown
King of Prussia
Reading
Ocean City
Cherry Hill
Lewes
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Newark
Millville
Chester

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 December 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$63Average$260FlexibilityNo cancel feeOn-time65%
FrontierCheapest$67Average$166FlexibilityNo cancel feeOn-time62%
DeltaCheapest$108Average$477FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$149Average$451FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$159Average$450FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$177Average$308FlexibilityNo cancel feeOn-time63%

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