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$68+ 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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — PHL
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
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 January 29, 2026.

This Frontier deal was found by Cheapflights users on 1/28. 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 2/2310:15 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Mon 3/27:35 am
PHL
-
ORD
Nonstop2h 36m
Frontier
Deal found 1/28$98
This Super.com deal was found by Cheapflights users on 1/27. 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 2/138:20 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Mon 2/169:47 pm
PHL
-
ORD
Nonstop2h 36m
Frontier
Deal found 1/27$107
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Mon 2/2310:15 am
ORD
-
PHL
Nonstop2h 09m
Multiple Airlines
Tue 3/38:06 am
PHL
-
ORD
1 stop14h 07m
Multiple Airlines
Deal found 1/28$110
This Expedia deal was found by Cheapflights users on 1/28. 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.
Fri 2/138:20 am
ORD
-
PHL
Nonstop2h 09m
Multiple Airlines
Wed 2/185:26 pm
PHL
-
ORD
1 stop7h 21m
Multiple Airlines
Deal found 1/28$112
This Frontier deal was found by Cheapflights users on 1/28. 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 2/2310:15 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Tue 2/2411:40 am
PHL
-
ORD
1 stop6h 12m
Frontier
Deal found 1/28$113
This Expedia deal was found by Cheapflights users on 1/28. 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.
Tue 3/310:44 am
ORD
-
PHL
1 stop11h 32m
Spirit Airlines
Wed 3/45:26 pm
PHL
-
ORD
1 stop7h 21m
Spirit Airlines
Deal found 1/28$115
This Frontier deal was found by Cheapflights users on 1/28. 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 2/138:20 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Sat 2/215:30 am
PHL
-
ORD
1 stop6h 16m
Frontier
Deal found 1/28$118
This Expedia deal was found by Cheapflights users on 1/28. 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.
Tue 3/312:44 pm
ORD
-
PHL
1 stop9h 32m
Spirit Airlines
Sat 3/75:26 pm
PHL
-
ORD
1 stop7h 21m
Spirit Airlines
Deal found 1/28$119
This Super.com deal was found by Cheapflights users on 1/29. 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 2/279:52 am
ORD
-
PHL
Nonstop2h 06m
Frontier
Mon 3/27:35 am
PHL
-
ORD
Nonstop2h 36m
Frontier
Deal found 1/29$121
This Frontier deal was found by Cheapflights users on 1/28. 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 2/2310:15 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Thu 2/2612:28 pm
PHL
-
ORD
1 stop11h 11m
Frontier
Deal found 1/28$123
This Priceline deal was found by Cheapflights users on 1/27. 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 2/187:00 am
MDW
-
PHL
1 stop9h 32m
Frontier
Wed 2/2511:40 am
PHL
-
MDW
1 stop8h 27m
Frontier
Deal found 1/27$128
This Expedia deal was found by Cheapflights users on 1/27. 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.
Tue 2/243:49 pm
STL
-
PHL
1 stop19h 33m
Frontier
Tue 3/311:03 am
PHL
-
STL
1 stop12h 24m
Frontier
Deal found 1/27$128

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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$98
(Frontier)

One-way from

$68
(Kiwi.com)

Popular in

March

Cheapest in

October

Average price

$234

Good round-trip deal

$218 or less

Good one-way deal

$150 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. 16% potential increase in price ($52 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 January 2026
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 January 29, 2026.
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

Tue 2/24

3:49 pm-12:22 pm

1 stop19h 33m

Philadelphia

Tue 3/10

7:00 pm-10:37 am

1 stop16h 37m

$146

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 2/27

3:49 pm-9:06 am

1 stop16h 17m

Philadelphia

Fri 3/6

8:25 pm-9:49 am

1 stop14h 24m

$165

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 2/24

3:49 pm-6:15 am

2 stops13h 26m

Philadelphia

Sun 3/1

5:30 am-6:51 am

1 stop26h 21m

$180

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Sat 3/21

7:15 pm-10:10 pm

Nonstop1h 55m

Philadelphia

Tue 3/24

12:25 pm-1:40 pm

Nonstop2h 15m

$217

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Thu 4/2

6:20 pm-9:32 pm

Nonstop2h 12m

Philadelphia

Sat 4/4

4:55 pm-6:23 pm

Nonstop2h 28m

$217

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Sat 3/21

6:08 pm-9:09 pm

Nonstop2h 01m

Philadelphia

Tue 3/24

12:15 pm-1:49 pm

Nonstop2h 34m

$217

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 3/31

11:27 am-10:08 pm

1 stop9h 41m

Philadelphia

Sun 4/5

5:01 am-10:30 am

1 stop6h 29m

$226

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 2/13

8:20 pm-11:18 am

1 stop13h 58m

Philadelphia

Wed 2/18

3:45 pm-10:27 pm

1 stop7h 42m

$232

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Thu 4/2

1:10 pm-7:49 pm

1 stop5h 39m

Philadelphia

Sun 4/5

6:05 am-8:53 am

1 stop3h 48m

$237

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Fri 3/13

6:34 pm-11:00 pm

1 stop3h 26m

Philadelphia

Mon 3/23

5:40 am-12:02 pm

1 stop7h 22m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

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 $37). Flying from Illinois to Philadelphia in July is currently the most expensive (average of $103). 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 January 29, 2026.

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 17% versus a flight at noon.

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 January 24, 2026.

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 afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 January 29, 2026.

The most flights from USIL to PHL are scheduled on a Wednesday (38 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 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 $217, 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 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 Republic Airways (100%), Air Canada (86%) or Malaysia Airlines (84%) 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 $353, our data indicates the cheapest price to be $69. The most popular route (Chicago O'Hare Intl - Philadelphia), is priced around $108.

  • 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 $37). Flying from Illinois to Philadelphia in July is currently the most expensive (average of $103). 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
Reading
Ocean City
King of Prussia
Cherry Hill
Lewes
Dewey Beach
Ephrata
Camden
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Newark
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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$63Average$260FlexibilityNo cancel feeOn-time65%
FrontierCheapest$67Average$165FlexibilityNo cancel feeOn-time62%
DeltaCheapest$98Average$477FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$146Average$471FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$157Average$460FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$167Average$301FlexibilityNo cancel feeOn-time63%

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