HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$70+ 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 8/28. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Philadelphia to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Philadelphia to Illinois

Keep the following information in mind while searching for Philadelphia to Illinois flight deals. Data was last updated July 31, 2025.

Round-trip from

$141
(Kiwi.com)

One-way from

$70
(CheapOair)

Popular in

March

Cheapest in

September

Average price

$207

Good round-trip deal

$170 or less

Good one-way deal

$116 or less
From Philadelphia to Illinois
Search Deals
One-way flight from Philadelphia to Illinois
Search Deals
Highest demand for flights based on searches. 22% potential increase in price ($67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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

Find 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 July 31, 2025.

This Kiwi.com deal was found by Cheapflights users on 7/30. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2410:21 amPHL - ORD
Nonstop2h 31mFrontier
Mon 10/276:20 amORD - PHL
Nonstop2h 06mFrontier
Deal found 7/30$141
This Cheapflightsfares deal was found by Cheapflights users on 7/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/146:10 pmPHL - MDW
1 stop5h 48mFrontier
Fri 10/178:15 amMDW - PHL
Nonstop2h 02mFrontier
Deal found 7/29$142
This CheapOair deal was found by Cheapflights users on 7/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2910:21 amPHL - ORD
Nonstop2h 37mMultiple Airlines
Thu 10/212:05 pmORD - PHL
1 stop10h 54mMultiple Airlines
Deal found 7/29$155
This Mytrip deal was found by Cheapflights users on 7/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/154:58 pmPHL - ORD
1 stop8h 01mSpirit Airlines
Sat 8/168:12 pmORD - PHL
1 stop12h 44mSpirit Airlines
Deal found 7/29$163
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/299:15 pmPHL - ORD
Nonstop2h 34mAmerican Airlines
Tue 9/25:00 amORD - PHL
Nonstop2h 03mAmerican Airlines
Deal found 7/29$177
This Southwest deal was found by Cheapflights users on 7/30. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/296:10 pmPHL - MDW
Nonstop2h 05mSouthwest
Sun 9/78:50 amMDW - PHL
Nonstop2h 00mSouthwest
Deal found 7/30$177
This Cheapflightsfares deal was found by Cheapflights users on 7/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/26:35 amPHL - STL
1 stop5h 15mSpirit Airlines
Sun 10/512:05 pmSTL - PHL
1 stop8h 34mSpirit Airlines
Deal found 7/29$184
This Delta deal was found by Cheapflights users on 7/31. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/265:15 pmPHL - MDW
1 stop5h 21mDelta
Tue 9/3012:43 pmMDW - PHL
1 stop6h 10mDelta
Deal found 7/31$197
This CheapOair deal was found by Cheapflights users on 7/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/55:15 amPHL - STL
1 stop8h 47mMultiple Airlines
Sun 9/712:05 pmSTL - PHL
1 stop8h 34mMultiple Airlines
Deal found 7/29$198
This American Airlines deal was found by Cheapflights users on 7/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2010:34 amPHL - STL
Nonstop2h 36mAmerican Airlines
Wed 9/246:00 amSTL - PHL
Nonstop2h 18mAmerican Airlines
Deal found 7/29$217
This Frontier deal was found by Cheapflights users on 7/30. 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.
Tue 8/125:30 pmPHL - STL
1 stop7h 17mFrontier
Wed 8/137:29 pmSTL - PHL
1 stop8h 40mFrontier
Deal found 7/30$218
This Mytrip deal was found by Cheapflights users on 7/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/56:35 amPHL - RFD
2 stops8h 50mMultiple Airlines
Mon 9/810:37 amRFD - PHL
2 stops22h 09mMultiple Airlines
Deal found 7/29$219

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 July 31, 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

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Fri 10/24

10:21 am-11:52 am

Nonstop2h 31m

Chicago O'Hare Intl

Mon 10/27

6:20 am-9:26 am

Nonstop2h 06m

$141

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Tue 10/14

6:10 pm-10:58 pm

1 stop5h 48m

Chicago Midway

Fri 10/17

8:15 am-11:17 am

Nonstop2h 02m

$142

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Mon 9/29

10:21 am-11:58 am

Nonstop2h 37m

Chicago O'Hare Intl

Thu 10/2

12:05 pm-11:59 pm

1 stop10h 54m

$155

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Fri 8/15

4:58 pm-11:59 pm

1 stop8h 01m

Chicago O'Hare Intl

Sat 8/16

8:12 pm-9:56 am

1 stop12h 44m

$163

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Fri 8/29

9:15 pm-10:49 pm

Nonstop2h 34m

Chicago O'Hare Intl

Tue 9/2

5:00 am-8:03 am

Nonstop2h 03m

$177

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Fri 8/29

4:25 pm-5:30 pm

Nonstop2h 05m

Chicago Midway

Tue 9/2

7:00 am-9:55 am

Nonstop1h 55m

$177

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Thu 10/2

6:35 am-10:50 am

1 stop5h 15m

Lambert-St Louis

Sun 10/5

12:05 pm-9:39 pm

1 stop8h 34m

$184

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Fri 9/26

5:15 pm-9:36 pm

1 stop5h 21m

Chicago Midway

Tue 9/30

12:43 pm-7:53 pm

1 stop6h 10m

$197

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Fri 9/5

5:15 am-1:02 pm

1 stop8h 47m

Lambert-St Louis

Sun 9/7

12:05 pm-9:39 pm

1 stop8h 34m

$198

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Sat 9/20

10:34 am-12:10 pm

Nonstop2h 36m

Lambert-St Louis

Wed 9/24

6:00 am-9:18 am

Nonstop2h 18m

$217

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 53 results
1
2
3
...
6

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, August is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $245). Flying from Philadelphia to Illinois in March is currently the most expensive (average of $321). 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 July 31, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Philadelphia to Illinois as you normally would.

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 July 31, 2025.

The most flights from PHL to USIL are scheduled on a Thursday (46 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (26 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 July 31, 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
4,244 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Southwest
8.0
Very good
4,244 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
Delta
8.0
Very good
7,980 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
United Airlines
7.4
Good
8,902 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
JetBlue
7.3
Good
2,913 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,244 reviews

Entertainment

7.5

Crew

8.6

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Gina,Jul 2025

LAS - DEN

We experienced bad weather, which turned our 1.5 hour flight from Las Vegas to Denver, into 3.5. The pilot and crew kept us updated and explained that we had to circle and or possibly redirect to another airport. After circling for sometime, we were able to land smoothly in Denver. Thank you to all the flight crew, tower control, and all who got us to our destination safely.

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.

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

    For one-way options, check prices for Spirit Airlines. According to our data, you can fly for as low as $70. Users have also found prices from $73 and $89 on Frontier and American 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 (85%), SWISS (82%), Royal Jordanian (77%).

  • What are the cheapest flights from Philadelphia to Illinois?

    The cheapest flight price from Philadelphia to Illinois is $70. On average you can expect to pay $1,463. The most popular route, (Philadelphia - Chicago O'Hare Intl), can usually be booked for $145.

  • 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, August is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $245). Flying from Philadelphia to Illinois in March is currently the most expensive (average of $321). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Philadelphia to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
Newark to Fort Lauderdale flights
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Las Vegas flights
Newark to O'Hare Intl flights
Newark to Los Angeles flights
LaGuardia to O'Hare Intl flights
LaGuardia to Fort Lauderdale flights
John F Kennedy Intl to Orlando flights
John F Kennedy Intl to Miami flights
Newark to Orlando flights
John F Kennedy Intl to O'Hare Intl flights
John F Kennedy Intl to Seattle flights
John F Kennedy Intl to San Francisco flights
Newark to Miami flights
LaGuardia to Miami flights
LaGuardia to Dallas/Fort Worth flights
Newark to Seattle flights
Newark to San Francisco flights
John F Kennedy Intl to Fort Lauderdale flights
John F Kennedy Intl to Atlanta flights
LaGuardia to Orlando flights
LaGuardia to Atlanta flights
Newark to Las Vegas flights
LaGuardia to Los Angeles flights
LaGuardia to Las Vegas flights
Newark to Atlanta flights
Dulles Intl to Miami flights
John F Kennedy Intl to West Palm Beach flights
Dulles Intl to Dallas/Fort Worth flights
Reagan-National to O'Hare Intl flights
Newark to Dallas/Fort Worth flights
Dulles Intl to Las Vegas flights
John F Kennedy Intl to Dallas/Fort Worth flights
Philadelphia to O'Hare Intl flights
Philadelphia to Orlando flights
Reagan-National to Seattle flights
LaGuardia to Seattle flights
Dulles Intl to O'Hare Intl flights
LaGuardia to San Francisco flights
Reagan-National to Los Angeles flights
Newark to Tampa flights
John F Kennedy Intl to Hobby flights
LaGuardia to Denver flights
Newark to Burbank flights
Newark to Denver flights
John F Kennedy Intl to Midway flights
John F Kennedy Intl to Honolulu flights
Philadelphia to Fort Lauderdale flights
Newark to Midway flights
Reagan-National to Las Vegas flights

Top 5 airlines flying from Philadelphia to Illinois

Discover the top 5 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 July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$52Average$150FlexibilityNo cancel feeOn-time62%
DeltaCheapest$118Average$281FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$144Average$352FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$157Average$434FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$163Average$298FlexibilityNo cancel feeOn-time63%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.