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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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
PHL — ORD
Jan 25 — Feb 11
Sat 1/25
Sat 2/1
1 adult, Economy
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Cheap flight deals from Philadelphia to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Philadelphia (PHL) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 20, 2025.

Round-trip from

$119
(Frontier)

One-way from

$55
(Cheapflightsfares)
From Philadelphia to Illinois
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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 January 20, 2025.

This Frontier deal was found by Cheapflights users on 1/19. 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.
Sat 2/810:18 pmPHL - ORD
1 stop12h 34mFrontier
Sun 3/210:26 pmORD - PHL
1 stop7h 50mFrontier
Deal found 1/19$119
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2710:59 pmPHL - MDW
1 stop21h 20mFrontier
Mon 3/36:48 pmMDW - PHL
1 stop11h 38mFrontier
Deal found 1/20$119
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/1010:59 pmPHL - STL
1 stop25h 50mFrontier
Wed 3/125:24 pmSTL - PHL
1 stop13h 06mFrontier
Deal found 1/20$120
This Richmond deal was found by Cheapflights users on 1/20. 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 Richmond is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/266:39 pmPHL - ORD
1 stop16h 05mSpirit Airlines
Tue 4/17:07 pmORD - PHL
1 stop14h 06mSpirit Airlines
Deal found 1/20$153
This Kiwi.com deal was found by Cheapflights users on 1/19. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/316:39 amPHL - ORD
1 stop10h 31mMultiple Airlines
Mon 2/33:16 pmORD - PHL
1 stop7h 42mMultiple Airlines
Deal found 1/19$157
This CheapOair deal was found by Cheapflights users on 1/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/198:59 pmPHL - STL
1 stop18h 43mMultiple Airlines
Wed 2/265:20 pmSTL - PHL
1 stop20h 58mMultiple Airlines
Deal found 1/20$157
This American Airlines deal was found by Cheapflights users on 1/20. 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.
Wed 4/167:25 amPHL - ORD
Nonstop2h 24mAmerican Airlines
Wed 4/236:45 amORD - PHL
Nonstop2h 01mAmerican Airlines
Deal found 1/20$177
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/165:02 pmPHL - MDW
1 stop6h 27mDelta
Wed 4/234:59 pmMDW - PHL
1 stop6h 25mDelta
Deal found 1/20$197
This American Airlines deal was found by Cheapflights users on 1/20. 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.
Tue 2/255:10 pmPHL - MLI
1 stop6h 16mAmerican Airlines
Tue 3/1112:40 pmMLI - PHL
1 stop6h 28mAmerican Airlines
Deal found 1/20$199
This JetBlue deal was found by Cheapflights users on 1/20. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/1211:10 amPHL - ORD
1 stop7h 45mJetBlue
Wed 2/1912:45 pmORD - PHL
1 stop8h 42mJetBlue
Deal found 1/20$206
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/256:07 pmPHL - MLI
1 stop5h 19mDelta
Wed 3/125:03 pmMLI - PHL
1 stop6h 42mDelta
Deal found 1/20$217
This United Airlines deal was found by Cheapflights users on 1/19. 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.
Sat 2/156:30 amPHL - ORD
Nonstop2h 31mUnited Airlines
Sat 2/156:30 pmORD - PHL
Nonstop2h 04mUnited Airlines
Deal found 1/19$219

Find flights from Philadelphia to Illinois within your budget

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 January 20, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Sat 2/8

10:18 pm-9:52 am

1 stop12h 34m

Chicago O'Hare Intl

Sun 3/2

10:26 pm-7:16 am

1 stop7h 50m

$119

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Thu 2/27

10:59 pm-7:19 pm

1 stop21h 20m

Chicago Midway

Mon 3/3

6:48 pm-7:26 am

1 stop11h 38m

$119

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Mon 3/10

10:59 pm-11:49 pm

1 stop25h 50m

Lambert-St Louis

Wed 3/12

5:24 pm-7:30 am

1 stop13h 06m

$120

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Wed 3/26

6:39 pm-9:44 am

1 stop16h 05m

Chicago O'Hare Intl

Tue 4/1

7:07 pm-10:13 am

1 stop14h 06m

$153

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Wed 2/5

6:00 am-12:29 pm

1 stop7h 29m

Chicago O'Hare Intl

Thu 2/6

6:50 am-12:08 am

1 stop16h 18m

$155

PhiladelphiaSt. Louis

PHL - STL

PHLSTL

Philadelphia

Wed 2/19

8:59 pm-2:42 pm

1 stop18h 43m

Lambert-St Louis

Wed 2/26

5:20 pm-3:18 pm

1 stop20h 58m

$157

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Wed 4/16

7:25 am-8:49 am

Nonstop2h 24m

Chicago O'Hare Intl

Wed 4/23

6:45 am-9:46 am

Nonstop2h 01m

$177

PhiladelphiaChicago

PHL - MDW

PHLMDW

Philadelphia

Wed 4/16

5:02 pm-10:29 pm

1 stop6h 27m

Chicago Midway

Wed 4/23

4:59 pm-12:24 am

1 stop6h 25m

$197

PhiladelphiaMoline

PHL - MLI

PHLMLI

Philadelphia

Tue 2/25

5:10 pm-10:26 pm

1 stop6h 16m

Moline Quad-City

Tue 3/11

12:40 pm-8:08 pm

1 stop6h 28m

$199

PhiladelphiaChicago

PHL - ORD

PHLORD

Philadelphia

Wed 2/12

11:10 am-5:55 pm

1 stop7h 45m

Chicago O'Hare Intl

Wed 2/19

12:45 pm-10:27 pm

1 stop8h 42m

$206

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/20

Showing 1-10 of 53 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.

Travel insights for flights from Philadelphia to Illinois

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

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 $320). 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 January 20, 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 January 20, 2025.

The most flights from PHL to USIL are scheduled on a Wednesday (31 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (21 on average).

Rainfall in Illinois by month

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

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

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

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 January 20, 2025.
See what other customers who have flown with Spirit Airlines, United Airlines and Southwest from Philadelphia to Illinois have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,696 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,521 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

JetBlue
7.4
Good
3,201 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,982 reviews
Southwest
8.1
Very good
4,659 reviews

Boarding

8.2

Overall

8.1

Comfort

8.1

Entertainment

7.7

Crew

8.7

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 Frontier. According to our data, you can fly for as low as $55. Users have also found prices from $76 and $89 on Spirit Airlines 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: Spirit Airlines (100%), SWISS (92%), British Airways (91%).

  • What are the cheapest flights from Philadelphia to Illinois?

    The cheapest flight price from Philadelphia to Illinois is $46. On average you can expect to pay $1,111. The most popular route, (Philadelphia - Chicago O'Hare Intl), can usually be booked for $140.

  • 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 $320). 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.

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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 January 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$48Average$123FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$131Average$477FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$139Average$401FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$150Average$245FlexibilityNo cancel feeOn-time63%
DeltaCheapest$186Average$319FlexibilityNo cancel feeOn-timeN/A
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