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$54+ 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 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Nov 12 — Nov 191
Wed 11/12
Wed 11/19
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 October 13, 2025.

This Frontier deal was found by Cheapflights users on 10/12. 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 11/32:35 pmPHL - ORD
1 stop9h 53mFrontier
Thu 11/63:18 pmORD - PHL
1 stop8h 01mFrontier
Deal found 10/12$108
This CheapOair deal was found by Cheapflights users on 10/12. 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.
Wed 10/296:50 pmPHL - MDW
1 stop15h 22mFrontier
Sat 11/11:37 pmMDW - PHL
1 stop9h 36mFrontier
Deal found 10/12$108
This Booking.com deal was found by Cheapflights users on 10/11. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/276:42 amPHL - ORD
1 stop19h 17mFrontier
Mon 11/311:24 amORD - PHL
1 stop11h 55mFrontier
Deal found 10/11$109
This Booking.com deal was found by Cheapflights users on 10/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3011:18 amPHL - MDW
1 stop28h 04mFrontier
Thu 11/61:37 pmMDW - PHL
1 stop9h 42mFrontier
Deal found 10/12$109
This Frontier deal was found by Cheapflights users on 10/11. 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 11/146:00 amPHL - ORD
Nonstop2h 26mFrontier
Sun 11/165:11 amORD - PHL
Nonstop2h 12mFrontier
Deal found 10/11$110
This Kiwi.com deal was found by Cheapflights users on 10/12. 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 10/249:48 pmPHL - MDW
Nonstop2h 15mFrontier
Sun 10/268:25 amMDW - PHL
Nonstop2h 02mFrontier
Deal found 10/12$111
This Frontier deal was found by Cheapflights users on 10/13. 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 11/146:00 amPHL - ORD
Nonstop2h 26mFrontier
Mon 11/1711:53 amORD - PHL
1 stop11h 46mFrontier
Deal found 10/13$112
This Frontier deal was found by Cheapflights users on 10/12. 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 10/249:48 pmPHL - MDW
Nonstop2h 15mFrontier
Mon 10/275:52 pmMDW - PHL
Nonstop2h 01mFrontier
Deal found 10/12$112
This Frontier deal was found by Cheapflights users on 10/12. 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 10/274:10 pmPHL - ORD
Nonstop2h 30mFrontier
Sat 11/225:30 amORD - PHL
Nonstop2h 07mFrontier
Deal found 10/12$113
This Frontier deal was found by Cheapflights users on 10/12. 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.
Thu 11/131:19 pmPHL - MDW
Nonstop2h 14mFrontier
Fri 11/141:37 pmMDW - PHL
1 stop9h 42mFrontier
Deal found 10/12$113
This Frontier deal was found by Cheapflights users on 10/11. 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 10/174:04 pmPHL - ORD
Nonstop2h 30mFrontier
Sat 10/182:45 pmORD - PHL
Nonstop2h 15mFrontier
Deal found 10/11$114
This CheapOair deal was found by Cheapflights users on 10/12. 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 10/311:19 pmPHL - MDW
Nonstop2h 14mFrontier
Sun 11/26:06 pmMDW - PHL
1 stop17h 01mFrontier
Deal found 10/12$114

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 October 13, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$108
(Frontier)

One-way from

$54
(Frontier)

Popular in

March

Cheapest in

September

Average price

$228

Good round-trip deal

$162 or less

Good one-way deal

$115 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 ($50 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 October 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 October 13, 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

Tue 1/27

6:30 am-7:59 am

Nonstop2h 29m

Chicago O'Hare Intl

Tue 2/3

11:20 am-2:31 pm

Nonstop2h 11m

$139

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Wed 1/7

5:45 pm-7:00 pm

Nonstop2h 15m

Chicago Midway

Sat 1/10

9:45 am-12:40 pm

Nonstop1h 55m

$139

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Tue 1/6

6:30 am-7:59 am

Nonstop2h 29m

Chicago O'Hare Intl

Sat 1/10

11:20 am-2:31 pm

Nonstop2h 11m

$139

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Wed 2/11

1:10 pm-2:40 pm

Nonstop2h 30m

Chicago O'Hare Intl

Wed 2/18

2:15 pm-5:22 pm

Nonstop2h 07m

$139

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Wed 2/11

6:30 am-7:59 am

Nonstop2h 29m

Chicago O'Hare Intl

Sat 2/14

7:25 am-10:24 am

Nonstop1h 59m

$139

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Wed 12/24

1:50 pm-5:35 pm

1 stop4h 45m

Chicago Midway

Wed 12/31

6:05 pm-9:00 pm

Nonstop1h 55m

$149

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Sat 12/6

6:20 am-7:30 am

Nonstop2h 10m

Chicago Midway

Mon 12/8

8:10 am-11:05 am

Nonstop1h 55m

$158

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Wed 12/10

1:15 pm-2:35 pm

Nonstop2h 20m

Chicago O'Hare Intl

Sun 12/14

11:05 am-2:07 pm

Nonstop2h 02m

$158

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Mon 11/17

6:31 pm-8:00 pm

Nonstop2h 29m

Chicago O'Hare Intl

Tue 11/18

7:55 pm-11:03 pm

Nonstop2h 08m

$158

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Fri 11/28

6:00 am-7:26 am

Nonstop2h 26m

Chicago O'Hare Intl

Tue 12/2

9:00 am-12:07 pm

Nonstop2h 07m

$169

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/13

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 $44). 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 October 13, 2025.

It’s optimal to fly from Philadelphia to Illinois in the evening. By choosing this option you can save up to 57% 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 October 13, 2024.

Travelers seeking maximum savings on their Philadelphia to Illinois flight should consider departing on Wednesday 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 October 13, 2025.

The most flights from PHL to USIL are scheduled on a Sunday (49 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (31 on average).

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

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 October 13, 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
4,235 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

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
4,235 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

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
8.0
Very good
7,973 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

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
8,974 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

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
11,045 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

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
3,136 reviews
Southwest
8.0
Very good
4,235 reviews

Boarding

8.1

Entertainment

7.5

Food

7.0

Overall

8.0

Comfort

8.0

Crew

8.6

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, Southwest, and Delta can get you from Philadelphia to Illinois in just under 2h 15m. Your travel time can differ by up to 2h 47m. The distance from Philadelphia to Illinois is about 666 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 $60. Users have also found prices from $80 and $80 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 (89%), SWISS (89%), Air Canada (77%).

  • What are the cheapest flights from Philadelphia to Illinois?

    The cheapest flight price from Philadelphia to Illinois is $74. On average you can expect to pay $813. The most popular route, (Philadelphia - Chicago O'Hare Intl), can usually be booked for $125.

  • 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 $44). 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 October 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$62Average$174FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$83Average$185FlexibilityNo cancel feeOn-time65%
DeltaCheapest$118Average$346FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$157Average$365FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$165Average$307FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$166Average$397FlexibilityNo cancel feeOn-time71%

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