HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Philadelphia

$55+ 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 3/12. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — PHL
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Illinois to Philadelphia 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 Illinois to Philadelphia

Keep the following information in mind while searching for Illinois to Philadelphia flight deals. Data was last updated February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$110
(Frontier)

One-way from

$55
(Frontier)

Popular in

February

Cheapest in

August

Average price

$361

Good round-trip deal

$219 or less

Good one-way deal

$109 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. 35% potential increase in price ($111 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 7% potential price decrease ($15 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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

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 February 20, 2025.

This Frontier deal was found by Cheapflights users on 2/19. 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 4/235:41 pmSTL - PHL
1 stop12h 51mFrontier
Sat 4/264:28 pmPHL - STL
1 stop8h 36mFrontier
Deal found 2/19$110
This CheapOair deal was found by Cheapflights users on 2/19. 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.
Sun 3/306:47 pmSTL - PHL
1 stop13h 11mMultiple Airlines
Tue 4/14:16 pmPHL - STL
1 stop8h 30mMultiple Airlines
Deal found 2/19$139
This Mytrip deal was found by Cheapflights users on 2/18. 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.
Sun 3/306:47 pmSTL - PHL
1 stop13h 11mSpirit Airlines
Mon 3/317:40 pmPHL - STL
1 stop23h 12mSpirit Airlines
Deal found 2/18$161
This CheapOair deal was found by Cheapflights users on 2/18. 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 3/147:42 pmORD - PHL
1 stop12h 16mSpirit Airlines
Sat 3/226:34 pmPHL - ORD
1 stop15h 10mSpirit Airlines
Deal found 2/18$206
This Flightnetwork deal was found by Cheapflights users on 2/20. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/35:15 amMDW - PHL
1 stop19h 00mFrontier
Sun 4/611:57 amPHL - MDW
Nonstop2h 24mFrontier
Deal found 2/20$208
This Mytrip deal was found by Cheapflights users on 2/19. 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.
Thu 3/66:25 pmPIA - PHL
1 stop13h 33mMultiple Airlines
Mon 3/107:05 amPHL - PIA
1 stop8h 17mMultiple Airlines
Deal found 2/19$215
This Southwest deal was found by Cheapflights users on 2/19. 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.
Tue 4/17:00 pmMDW - PHL
Nonstop1h 50mSouthwest
Sat 4/56:55 amPHL - MDW
Nonstop2h 10mSouthwest
Deal found 2/19$220
This American Airlines deal was found by Cheapflights users on 2/20. 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 4/126:45 amORD - PHL
Nonstop2h 03mAmerican Airlines
Tue 4/157:25 amPHL - ORD
Nonstop2h 24mAmerican Airlines
Deal found 2/20$220
This American Airlines deal was found by Cheapflights users on 2/19. 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.
Wed 4/2311:21 amMLI - PHL
1 stop6h 34mAmerican Airlines
Mon 4/282:20 pmPHL - MLI
1 stop8h 03mAmerican Airlines
Deal found 2/19$224
This United Airlines deal was found by Cheapflights users on 2/19. 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.
Tue 4/111:10 amORD - PHL
Nonstop2h 08mUnited Airlines
Tue 4/810:43 amPHL - ORD
1 stop4h 27mUnited Airlines
Deal found 2/19$232
This Mytrip deal was found by Cheapflights users on 2/19. 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 2/286:45 pmORD - PHL
1 stop25h 19mMultiple Airlines
Mon 3/310:02 amPHL - ORD
2 stops27h 35mMultiple Airlines
Deal found 2/19$235
This Delta deal was found by Cheapflights users on 2/19. 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.
Sat 4/54:00 pmMDW - PHL
1 stop7h 48mDelta
Wed 4/96:00 amPHL - MDW
1 stop3h 43mDelta
Deal found 2/19$240

Find flights from Illinois to Philadelphia within your budget

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 February 20, 2025.

Fly from

Illinois

Fly to

Philadelphia

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Wed 4/23

5:41 pm-7:32 am

1 stop12h 51m

Philadelphia

Sat 4/26

4:28 pm-12:04 am

1 stop8h 36m

$110

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sun 3/30

6:47 pm-8:58 am

1 stop13h 11m

Philadelphia

Tue 4/1

4:16 pm-11:46 pm

1 stop8h 30m

$139

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Sun 3/30

6:47 pm-8:58 am

1 stop13h 11m

Philadelphia

Mon 3/31

7:40 pm-5:52 pm

1 stop23h 12m

$161

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Fri 3/14

7:42 pm-8:58 am

1 stop12h 16m

Philadelphia

Sat 3/22

6:34 pm-8:44 am

1 stop15h 10m

$206

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Thu 4/3

5:15 am-1:15 am

1 stop19h 00m

Philadelphia

Sun 4/6

11:57 am-1:21 pm

Nonstop2h 24m

$208

PeoriaPhiladelphia

PIA - PHL

PIAPHL

Greater Peoria

Thu 3/6

6:25 pm-8:58 am

1 stop13h 33m

Philadelphia

Mon 3/10

7:05 am-2:22 pm

1 stop8h 17m

$215

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Tue 4/1

7:00 pm-9:50 pm

Nonstop1h 50m

Philadelphia

Sat 4/5

6:55 am-8:05 am

Nonstop2h 10m

$220

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Sat 4/12

6:45 am-9:48 am

Nonstop2h 03m

Philadelphia

Tue 4/15

7:25 am-8:49 am

Nonstop2h 24m

$220

MolinePhiladelphia

MLI - PHL

MLIPHL

Moline Quad-City

Wed 4/23

11:21 am-6:55 pm

1 stop6h 34m

Philadelphia

Mon 4/28

2:20 pm-9:23 pm

1 stop8h 03m

$224

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 4/1

11:10 am-2:18 pm

Nonstop2h 08m

Philadelphia

Tue 4/8

10:43 am-2:10 pm

1 stop4h 27m

$232

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/19

Showing 1-10 of 59 results
1
2
3
...
6

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.

Travel insights for flights from Illinois to Philadelphia

Get recent, data-driven insights about flights from Illinois to Philadelphia including ideal travel times, pricing trends, and more.

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 February 20, 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 February 20, 2025.

The most flights from USIL to PHL are scheduled on a Thursday (37 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 on average).

Rainfall in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Philadelphia ranges from 2.7 - 4.4 inches per month. July is typically the wettest month, when rainfall can reach 4.4 in. February is typically the driest time to visit Philadelphia when rainfall is around 2.7 in.

Temperature in Philadelphia by month

Plan your trip to Philadelphia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Philadelphia, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 33.8 F).

Reviews of airlines servicing Philadelphia

Get insights into the airlines that provide service to Philadelphia. 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 Philadelphia. Reviews last updated February 20, 2025.
See what other customers who have flown with Southwest, Alaska Airlines and Delta from Illinois to Philadelphia have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,697 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,219 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

JetBlue
7.4
Good
3,070 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,765 reviews
Southwest
8.1
Very good
4,411 reviews

Crew

8.7

Overall

8.1

Boarding

8.2

Entertainment

7.6

Food

7.1

Comfort

8.1

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

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.

  • 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 $55. However, be on the lookout for offers from Spirit Airlines and Delta, 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 Copa Airlines (100%), Spirit Airlines (100%) or Malaysia Airlines (87%) 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 $614, our data indicates the cheapest price to be $98. The most popular route (Chicago O'Hare Intl - Philadelphia), is priced around $105.

  • 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 Illinois?

Book flights to Illinois if you plan to visit one of these locations
King of Prussia
Vineland
Pottstown
Reading
Wildwood
Exton
Ocean City
Cherry Hill
Essington
Chester
Willow Grove
Newark
Middletown
Millville
Wyomissing
Ephrata
Dewey Beach
West Chester
Malvern
Dover

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 Illinois to Philadelphia

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to John F Kennedy Intl flights
Los Angeles to Newark flights
Dallas/Fort Worth to LaGuardia flights
San Francisco to John F Kennedy Intl flights
O'Hare Intl to John F Kennedy Intl flights
Dallas/Fort Worth to John F Kennedy Intl flights
Dallas/Fort Worth to Newark flights
San Francisco to Newark flights
Los Angeles to LaGuardia flights
Atlanta to John F Kennedy Intl flights
Seattle to John F Kennedy Intl flights
Fort Lauderdale to LaGuardia flights
Fort Lauderdale to Newark flights
Seattle to Newark flights
Dallas/Fort Worth to Dulles Intl flights
Miami to Newark flights
O'Hare Intl to LaGuardia flights
Miami to John F Kennedy Intl flights
O'Hare Intl to Newark flights
Miami to LaGuardia flights
Denver to John F Kennedy Intl flights
Los Angeles to Reagan-National flights
Orlando to John F Kennedy Intl flights
Los Angeles to Dulles Intl flights
Austin to John F Kennedy Intl flights
Hobby to LaGuardia flights
Fort Lauderdale to John F Kennedy Intl flights
San Francisco to LaGuardia flights
Burbank to Newark flights
Orlando to LaGuardia flights
Charlotte to John F Kennedy Intl flights
Hobby to John F Kennedy Intl flights
Sky Harbor Intl to John F Kennedy Intl flights
Orlando to Newark flights
Atlanta to Newark flights
Denver to LaGuardia flights
Atlanta to LaGuardia flights
Santa Ana to Newark flights
San Francisco to Dulles Intl flights
Minneapolis to LaGuardia flights
Boston to Dulles Intl flights
Atlanta to Dulles Intl flights
Seattle to Reagan-National flights
Minneapolis to Newark flights
O'Hare Intl to Dulles Intl flights
Boston to Philadelphia flights
San Francisco to Reagan-National flights
Tampa to LaGuardia flights
Austin to Newark flights
Tampa to Newark flights

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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$51Average$108FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$136Average$333FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$138Average$447FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$159Average$287FlexibilityNo 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.