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$70+ 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 5/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — PHL
may. 4 — may. 111
lun. 5/4
lun. 5/11
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 abril 4, 2026.

This Expedia deal was found by Cheapflights users on 3/30. 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.
vie. 4/248:23 pm
STL
-
PHL
1 stop10h 47m
Frontier
dom. 4/265:01 am
PHL
-
STL
1 stop6h 48m
Frontier
Deal found 3/30$140
This Expedia deal was found by Cheapflights users on 3/30. 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. 4/224:59 pm
STL
-
PHL
1 stop13h 42m
Frontier
jue. 4/2310:38 pm
PHL
-
STL
1 stop25h 41m
Frontier
Deal found 3/30$141
This CheapOair deal was found by Cheapflights users on 3/31. 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.
mié. 4/224:59 pm
STL
-
PHL
1 stop17h 41m
Frontier
dom. 4/265:01 am
PHL
-
STL
1 stop6h 48m
Frontier
Deal found 3/31$151
This Expedia deal was found by Cheapflights users on 4/2. 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.
vie. 4/244:59 pm
STL
-
PHL
1 stop13h 42m
Frontier
lun. 4/277:30 am
PHL
-
STL
1 stop16h 49m
Frontier
Deal found 4/2$160
This Kiwi.com deal was found by Cheapflights users on 4/1. 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.
jue. 4/3011:21 am
STL
-
PHL
1 stop9h 36m
Multiple Airlines
dom. 5/37:00 am
PHL
-
STL
1 stop24h 50m
Multiple Airlines
Deal found 4/1$165
This CheapOair deal was found by Cheapflights users on 3/31. 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.
mar. 4/144:59 pm
STL
-
PHL
1 stop16h 54m
Frontier
mié. 5/610:40 am
PHL
-
STL
1 stop25h 41m
Frontier
Deal found 3/31$171
This CheapOair deal was found by Cheapflights users on 4/1. 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. 5/216:33 pm
STL
-
PHL
1 stop11h 39m
Frontier
mar. 5/269:16 pm
PHL
-
STL
1 stop28h 05m
Frontier
Deal found 4/1$176
This Frontier deal was found by Cheapflights users on 3/30. 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. 5/287:52 pm
ORD
-
PHL
Nonstop2h 26m
Frontier
mar. 6/21:30 pm
PHL
-
ORD
1 stop7h 21m
Frontier
Deal found 3/30$179
This Expedia deal was found by Cheapflights users on 3/31. 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. 4/142:15 pm
MDW
-
PHL
1 stop9h 39m
Frontier
vie. 4/179:17 am
PHL
-
MDW
1 stop11h 14m
Frontier
Deal found 3/31$180
This Frontier deal was found by Cheapflights users on 3/31. 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. 5/289:07 pm
ORD
-
PHL
1 stop11h 03m
Frontier
dom. 5/316:00 am
PHL
-
ORD
1 stop7h 37m
Frontier
Deal found 3/31$180
This Priceline deal was found by Cheapflights users on 3/31. 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.
vie. 4/178:06 pm
STL
-
PHL
1 stop8h 28m
Frontier
sáb. 4/184:42 pm
PHL
-
STL
1 stop7h 37m
Frontier
Deal found 3/31$180
This Frontier deal was found by Cheapflights users on 4/1. 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.
vie. 4/246:49 pm
MDW
-
PHL
1 stop11h 52m
Frontier
lun. 4/279:17 am
PHL
-
MDW
1 stop11h 14m
Frontier
Deal found 4/1$181

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 abril 4, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$140
(Priceline)

One-way from

$70
(Frontier)

Popular in

March

Cheapest in

October

Average price

$277

Good round-trip deal

$266 or less

Good one-way deal

$143 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 ($57 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 abril 4, 2026.
Use the filters below to find and compare flights from Illinois to Philadelphia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

EvansvillePhiladelphia

EVV - PHL

EVVPHL

Evansville Dress Regional

vie. 5/1

7:53 am-11:08 pm

1 stop14h 15m

Philadelphia

dom. 5/3

5:05 am-3:23 pm

1 stop11h 18m

$228
Quickest round-trip

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

vie. 5/1

3:25 pm-6:25 pm

Nonstop2h 00m

Philadelphia

lun. 5/4

11:10 am-12:20 pm

Nonstop2h 10m

$237

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

mié. 5/13

9:54 pm-12:59 am

Nonstop2h 05m

Philadelphia

dom. 5/17

6:10 am-7:39 am

Nonstop2h 29m

$237

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

dom. 5/10

6:55 am-9:59 am

Nonstop2h 04m

Philadelphia

mar. 5/12

11:32 am-1:01 pm

Nonstop2h 29m

$237

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

dom. 5/3

6:55 am-9:59 am

Nonstop2h 04m

Philadelphia

dom. 5/10

8:30 pm-9:59 pm

Nonstop2h 29m

$237

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

jue. 5/7

11:40 am-4:45 pm

1 stop4h 05m

Philadelphia

sáb. 5/9

3:45 pm-5:00 pm

Nonstop2h 15m

$247

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

sáb. 5/2

7:40 am-10:35 am

Nonstop1h 55m

Philadelphia

sáb. 5/9

5:30 pm-10:35 pm

1 stop6h 05m

$247

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

sáb. 7/4

6:04 pm-9:24 pm

Nonstop2h 20m

Philadelphia

mar. 7/7

5:00 pm-6:33 pm

Nonstop2h 33m

$247

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

vie. 5/8

6:23 am-3:00 pm

1 stop7h 37m

Philadelphia

dom. 5/10

8:05 am-11:56 am

1 stop4h 51m

$257

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

jue. 4/30

1:24 pm-7:18 pm

1 stop4h 54m

Philadelphia

lun. 5/4

5:19 pm-10:28 pm

1 stop6h 09m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/31

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $34). 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 abril 4, 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 18% 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 April 4, 2026.

Travelers seeking maximum savings on their Illinois to Philadelphia flight should consider departing on Friday 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 abril 4, 2026.

The most flights from USIL to PHL are scheduled on a Friday (39 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (8 on average).

How much does it cost to fly round-trip from Illinois to Philadelphia?

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 $237, Southwest can have you in Philadelphia from Illinois in 2h. 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 Southwest and American Airlines, 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 Royal Jordanian (79%), United Airlines (75%) or Republic Airways (75%) 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 $757, our data indicates the cheapest price to be $103. The most popular route (Chicago O'Hare Intl - Philadelphia), is priced around $115.

  • 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 $34). 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
Reading
King of Prussia
Camden
Ocean City
Lewes
Dewey Beach
Pottstown
Ephrata
Vineland
Milford
Dover
Elkton
Essington
Willow Grove
New Castle
Millville
Glen Mills
Chester
Newark

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 4 airlines flying from Illinois to Philadelphia

Discover the top 4 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 abril 4, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$67Average$167FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$148Average$407FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$157Average$457FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$168Average$327FlexibilityNo cancel feeOn-time63%

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