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$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 2/17. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
פב​​​​​​​' 17 — פב​​​​​​​' 241
ג' 2/17
ג' 2/24
1 adult, Economy
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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 ינואר 18, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$113
(Frontier)

One-way from

$70
(Trip.com)

Popular in

March

Cheapest in

September

Average price

$208

Good round-trip deal

$314 or less

Good one-way deal

$175 or less
Provider with most accurate pricing for Philadelphia-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Philadelphia-Chicago (CHI) flights.
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From Philadelphia to Illinois
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One-way flight from Philadelphia to Illinois
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($52 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Price to beat on a round-trip flight from Philadelphia to Illinois.
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Price to beat on a one-way flight from Philadelphia to Illinois.
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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 ינואר 18, 2026.

This Frontier deal was found by Cheapflights users on 1/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ו' 2/69:09 pm
PHL
-
ORD
Nonstop2h 40m
Frontier
ו' 2/138:20 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Deal found 1/17$113
This Frontier deal was found by Cheapflights users on 1/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ב' 2/27:47 pm
PHL
-
ORD
Nonstop2h 40m
Frontier
ו' 2/64:44 pm
ORD
-
PHL
Nonstop2h 15m
Frontier
Deal found 1/16$118
This Frontier deal was found by Cheapflights users on 1/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ו' 2/69:09 pm
PHL
-
ORD
Nonstop2h 40m
Frontier
ב' 2/93:22 pm
ORD
-
PHL
Nonstop2h 15m
Frontier
Deal found 1/16$119
This Kiwi.com deal was found by Cheapflights users on 1/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ו' 2/69:09 pm
PHL
-
ORD
Nonstop2h 40m
Multiple Airlines
א' 2/88:43 pm
ORD
-
PHL
1 stop11h 04m
Multiple Airlines
Deal found 1/15$131
This Kiwi.com deal was found by Cheapflights users on 1/16. 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.
ג' 2/1011:40 am
PHL
-
ORD
1 stop6h 32m
Frontier
ו' 2/138:20 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Deal found 1/16$132
This Kiwi.com deal was found by Cheapflights users on 1/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ג' 2/312:40 pm
PHL
-
ORD
1 stop9h 23m
Multiple Airlines
ש' 2/712:00 pm
ORD
-
PHL
1 stop11h 30m
Multiple Airlines
Deal found 1/15$134
This Kiwi.com deal was found by Cheapflights users on 1/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ו' 2/69:09 pm
PHL
-
ORD
Nonstop2h 40m
Multiple Airlines
ג' 2/109:23 am
ORD
-
PHL
1 stop30h 52m
Multiple Airlines
Deal found 1/15$135
This Kiwi.com deal was found by Cheapflights users on 1/17. 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.
ב' 2/169:47 pm
PHL
-
ORD
Nonstop2h 36m
Frontier
ב' 2/236:19 pm
ORD
-
PHL
1 stop27h 30m
Frontier
Deal found 1/17$136
This Kiwi.com deal was found by Cheapflights users on 1/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ו' 2/69:09 pm
PHL
-
ORD
Nonstop2h 40m
Multiple Airlines
ד' 2/115:15 am
ORD
-
PHL
1 stop8h 41m
Multiple Airlines
Deal found 1/15$137
This Frontier deal was found by Cheapflights users on 1/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ו' 1/309:09 pm
PHL
-
ORD
Nonstop2h 40m
Frontier
ב' 2/23:22 pm
ORD
-
PHL
Nonstop2h 15m
Frontier
Deal found 1/16$138
This Kiwi.com deal was found by Cheapflights users on 1/16. 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.
ג' 2/177:10 pm
PHL
-
STL
1 stop12h 41m
Frontier
ו' 2/208:20 pm
STL
-
PHL
1 stop13h 58m
Frontier
Deal found 1/16$138
This Expedia deal was found by Cheapflights users on 1/17. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ב' 2/97:47 pm
PHL
-
ORD
Nonstop2h 40m
Frontier
ג' 2/108:30 am
ORD
-
PHL
1 stop26h 52m
Frontier
Deal found 1/17$139

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 ינואר 18, 2026.
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

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

ה' 2/26

5:05 am-11:59 pm

1 stop19h 54m

Lambert-St Louis

ה' 3/5

3:49 pm-7:36 am

1 stop14h 47m

$179

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

ו' 2/27

7:12 pm-6:51 am

1 stop12h 39m

Lambert-St Louis

א' 3/1

3:49 pm-11:18 am

2 stops18h 29m

$191

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

ו' 4/10

4:11 pm-11:55 pm

1 stop8h 44m

Lambert-St Louis

ש' 4/11

8:16 pm-5:31 am

1 stop8h 15m

$195

PhiladelphiaChicago

PHL - RFD

PHLRFD

Philadelphia

ד' 4/15

5:57 pm-9:47 am

1 stop16h 50m

Chicago Greater Rockford

ה' 4/23

10:37 am-11:59 pm

1 stop12h 22m

$206

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

ו' 2/13

7:12 pm-6:51 am

1 stop12h 39m

Lambert-St Louis

ו' 2/20

8:20 pm-11:18 am

1 stop13h 58m

$210

PhiladelphiaChicago

PHL - RFD

PHLRFD

Philadelphia

ש' 4/18

5:57 pm-9:47 am

1 stop16h 50m

Chicago Greater Rockford

ה' 4/23

10:37 am-11:59 pm

1 stop12h 22m

$216

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

ו' 3/13

7:05 pm-8:25 pm

Nonstop2h 20m

Chicago Midway

ב' 3/16

6:50 pm-9:45 pm

Nonstop1h 55m

$217

PhiladelphiaChicago

PHL - RFD

PHLRFD

Philadelphia

ש' 4/25

5:57 pm-9:47 am

1 stop16h 50m

Chicago Greater Rockford

ה' 4/30

10:37 am-11:59 pm

1 stop12h 22m

$226

PhiladelphiaChicago

PHL - RFD

PHLRFD

Philadelphia

ד' 4/22

5:57 pm-9:47 am

1 stop16h 50m

Chicago Greater Rockford

ה' 4/30

10:37 am-11:59 pm

1 stop12h 22m

$226

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

ש' 2/21

8:00 am-11:59 pm

2 stops16h 59m

Lambert-St Louis

ב' 2/23

8:22 pm-10:27 am

1 stop13h 05m

$228

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/16

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, December is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $48). 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 ינואר 18, 2026.

It’s optimal to fly from Philadelphia to Illinois in the evening. By choosing this option you can save up to 32% 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 January 10, 2026.

Travelers seeking maximum savings on their Philadelphia to Illinois flight should consider departing on Friday evenings when fares are most often at their lowest. Monday 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 ינואר 18, 2026.

The most flights from PHL to USIL are scheduled on a Sunday (41 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (28 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 ינואר 18, 2026.
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
4,261 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,261 reviews
Southwest
8.0
Very good
4,261 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,075 reviews
Southwest
8.0
Very good
4,261 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,174 reviews
Southwest
8.0
Very good
4,261 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,155 reviews
Southwest
8.0
Very good
4,261 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.7
Fair
3,057 reviews
Southwest
8.0
Very good
4,261 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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?

    Frontier, Southwest, and Delta can get you from Philadelphia to Illinois in just under 2h 20m. Your travel time can differ by up to 17h 34m. 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 $49. Users have also found prices from $69 and $75 on Southwest and United 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: Republic Airways (100%), Royal Jordanian (81%), Qatar Airways (79%).

  • What are the cheapest flights from Philadelphia to Illinois?

    The cheapest flight price from Philadelphia to Illinois is $67. On average you can expect to pay $855. The most popular route, (Philadelphia - Chicago O'Hare Intl), can usually be booked for $127.

  • 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, December is the cheapest month in which you can book a flight from Philadelphia to Illinois (average of $48). 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 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 ינואר 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$74Average$173FlexibilityNo cancel feeOn-time62%
DeltaCheapest$98Average$341FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$152Average$375FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$161Average$318FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$164Average$408FlexibilityNo cancel feeOn-time71%

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