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$55+ 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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Dec 17 — Dec 241
Wed 12/17
Wed 12/24
1 adult, Economy
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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 November 17, 2025.

This CheapOair deal was found by Cheapflights users on 11/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/244:50 pmPHL - MDW
Nonstop2h 16mFrontier
Sat 11/298:29 pmMDW - PHL
Nonstop1h 57mFrontier
Deal found 11/15$103
This Kiwi.com deal was found by Cheapflights users on 11/17. 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 12/511:10 amPHL - ORD
Nonstop2h 30mFrontier
Sun 12/77:00 amORD - PHL
1 stop21h 31mFrontier
Deal found 11/17$104
This Priceline deal was found by Cheapflights users on 11/15. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/244:50 pmPHL - MDW
Nonstop2h 16mFrontier
Mon 11/247:10 pmMDW - PHL
Nonstop1h 56mFrontier
Deal found 11/15$104
This Priceline deal was found by Cheapflights users on 11/17. 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.
Fri 12/511:10 amPHL - ORD
Nonstop2h 30mFrontier
Mon 12/83:23 pmORD - PHL
Nonstop2h 15mFrontier
Deal found 11/17$106
This Super.com deal was found by Cheapflights users on 11/17. 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.
Mon 11/244:50 pmPHL - MDW
Nonstop2h 16mFrontier
Mon 12/17:10 pmMDW - PHL
Nonstop1h 56mFrontier
Deal found 11/17$108
This CheapOair deal was found by Cheapflights users on 11/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1211:10 amPHL - ORD
Nonstop2h 30mFrontier
Sun 12/146:00 amORD - PHL
1 stop16h 15mFrontier
Deal found 11/15$109
This CheapOair deal was found by Cheapflights users on 11/17. 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 12/81:46 pmPHL - ORD
1 stop9h 38mFrontier
Mon 12/1511:01 amORD - PHL
1 stop12h 33mFrontier
Deal found 11/17$110
This CheapOair deal was found by Cheapflights users on 11/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/411:07 amPHL - MDW
1 stop11h 46mFrontier
Mon 12/88:42 pmMDW - PHL
1 stop12h 05mFrontier
Deal found 11/15$110
This Kiwi.com deal was found by Cheapflights users on 11/16. 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.
Fri 12/511:10 amPHL - ORD
Nonstop2h 30mFrontier
Fri 12/53:14 pmORD - PHL
1 stop7h 01mFrontier
Deal found 11/16$112
This CheapOair deal was found by Cheapflights users on 11/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/131:32 pmPHL - ORD
1 stop25h 38mFrontier
Mon 12/153:23 pmORD - PHL
Nonstop2h 15mFrontier
Deal found 11/16$117
This Super.com deal was found by Cheapflights users on 11/15. 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.
Sat 11/229:37 amPHL - ORD
Nonstop2h 34mFrontier
Mon 11/245:30 amORD - PHL
Nonstop2h 07mFrontier
Deal found 11/15$118
This FlightHub deal was found by Cheapflights users on 11/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/47:18 pmPHL - ORD
1 stop26h 24mMultiple Airlines
Sat 12/63:26 pmORD - PHL
1 stop6h 50mMultiple Airlines
Deal found 11/16$119

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 November 17, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$103
(Frontier)

One-way from

$55
(Frontier)

Popular in

March

Cheapest in

September

Average price

$209

Good round-trip deal

$149 or less

Good one-way deal

$142 or less
Provider with most accurate pricing for Philadelphia-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Philadelphia-Chicago (CHI) flights.
Search Deals
From Philadelphia to Illinois
Search Deals
One-way flight from Philadelphia to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($49 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 November 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

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 November 17, 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

Sat 2/14

6:32 am-8:05 am

Nonstop2h 33m

Chicago O'Hare Intl

Tue 2/17

7:25 am-10:24 am

Nonstop1h 59m

$139

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Tue 12/16

12:33 pm-2:04 pm

Nonstop2h 31m

Chicago O'Hare Intl

Wed 12/17

10:15 am-1:15 pm

Nonstop2h 00m

$139

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Thu 2/19

1:40 pm-2:55 pm

Nonstop2h 15m

Chicago Midway

Mon 2/23

6:00 pm-8:50 pm

Nonstop1h 50m

$148

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Sat 2/14

12:10 pm-9:50 pm

2 stops10h 40m

Chicago Midway

Tue 2/17

9:40 am-12:35 pm

Nonstop1h 55m

$154

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Sun 1/18

5:40 am-7:00 am

Nonstop2h 20m

Chicago Midway

Thu 1/22

10:00 am-12:55 pm

Nonstop1h 55m

$158

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Fri 1/30

5:00 pm-6:30 pm

Nonstop2h 30m

Chicago O'Hare Intl

Sun 2/1

8:56 am-12:07 pm

Nonstop2h 11m

$167

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Fri 1/23

5:40 am-7:00 am

Nonstop2h 20m

Chicago Midway

Sun 2/1

9:40 am-12:35 pm

Nonstop1h 55m

$167

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Fri 1/30

12:15 pm-1:30 pm

Nonstop2h 15m

Chicago Midway

Sun 2/1

9:40 am-12:35 pm

Nonstop1h 55m

$167

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Sat 1/17

6:00 am-11:47 am

1 stop6h 47m

Chicago O'Hare Intl

Sun 1/18

5:59 pm-12:23 am

1 stop5h 24m

$177

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Wed 12/17

10:32 am-3:20 pm

1 stop5h 48m

Chicago O'Hare Intl

Wed 12/24

6:02 pm-11:17 pm

1 stop4h 15m

$177

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/15

Showing 1-10 of 60 results
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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, November is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $54). Flying from Philadelphia to Illinois in July is currently the most expensive (average of $126). 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 November 17, 2025.

It’s optimal to fly from Philadelphia to Illinois in the evening. By choosing this option you can save up to 51% on the cost of your flight, compared to a flight at noon.

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

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

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

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 November 17, 2025.

The most flights from PHL to USIL are scheduled on a Monday (43 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (20 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 November 17, 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
4,245 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,245 reviews
Southwest
8.0
Very good
4,245 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
7.9
Good
8,008 reviews
Southwest
8.0
Very good
4,245 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
9,014 reviews
Southwest
8.0
Very good
4,245 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
11,048 reviews
Southwest
8.0
Very good
4,245 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,103 reviews
Southwest
8.0
Very good
4,245 reviews

Comfort

8.0

Crew

8.6

Boarding

8.1

Food

7.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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.

  • How long is the flight from Philadelphia to Illinois?

    United Airlines, American Airlines, and Southwest can get you from Philadelphia to Illinois in just under 2h 15m. Your travel time will be generally consistent. The distance from Philadelphia to Illinois is about 666 mi. Generally, flights for this route are nonstop.

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

    For one-way options, check prices for Frontier. According to our data, you can fly for as low as $61. Users have also found prices from $70 and $70 on United Airlines and Southwest, 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 (88%), Japan Airlines (83%), SWISS (83%).

  • 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 $873. The most popular route, (Philadelphia - Chicago O'Hare Intl), can usually be booked for $97.

  • 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, November is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $54). Flying from Philadelphia to Illinois in July is currently the most expensive (average of $126). 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

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Alternative routes for Philadelphia to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Philadelphia to Illinois

Discover the top 6 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 November 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$61Average$176FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$83Average$185FlexibilityNo cancel feeOn-time65%
DeltaCheapest$118Average$352FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$158Average$342FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$167Average$322FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$168Average$398FlexibilityNo cancel feeOn-time71%

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