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Delaware

$68+ Cheap flights from Illinois to Delaware

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 2/24. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ILG
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap flight deals from Illinois to Delaware

Cheapest flights from Illinois to Delaware
Explore the most affordable flight options available from Illinois to Delaware. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 29, 2026.

This Frontier deal was found by Cheapflights users on 1/28. 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 2/2310:15 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Mon 3/27:35 am
PHL
-
ORD
Nonstop2h 36m
Frontier
Deal found 1/28$98
This Super.com deal was found by Cheapflights users on 1/27. 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.
Fri 2/138:20 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Mon 2/169:47 pm
PHL
-
ORD
Nonstop2h 36m
Frontier
Deal found 1/27$107
This Kiwi.com deal was found by Cheapflights users on 1/28. 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.
Mon 2/2310:15 am
ORD
-
PHL
Nonstop2h 09m
Multiple Airlines
Tue 3/38:06 am
PHL
-
ORD
1 stop14h 07m
Multiple Airlines
Deal found 1/28$110
This Expedia deal was found by Cheapflights users on 1/28. 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.
Fri 2/138:20 am
ORD
-
PHL
Nonstop2h 09m
Multiple Airlines
Wed 2/185:26 pm
PHL
-
ORD
1 stop7h 21m
Multiple Airlines
Deal found 1/28$112
This Frontier deal was found by Cheapflights users on 1/28. 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 2/2310:15 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Tue 2/2411:40 am
PHL
-
ORD
1 stop6h 12m
Frontier
Deal found 1/28$113
This Expedia deal was found by Cheapflights users on 1/28. 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.
Tue 3/310:44 am
ORD
-
PHL
1 stop11h 32m
Spirit Airlines
Wed 3/45:26 pm
PHL
-
ORD
1 stop7h 21m
Spirit Airlines
Deal found 1/28$115
This Frontier deal was found by Cheapflights users on 1/28. 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 2/138:20 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Sat 2/215:30 am
PHL
-
ORD
1 stop6h 16m
Frontier
Deal found 1/28$118
This Expedia deal was found by Cheapflights users on 1/28. 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.
Tue 3/312:44 pm
ORD
-
PHL
1 stop9h 32m
Spirit Airlines
Sat 3/75:26 pm
PHL
-
ORD
1 stop7h 21m
Spirit Airlines
Deal found 1/28$119
This Super.com deal was found by Cheapflights users on 1/29. 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.
Fri 2/279:52 am
ORD
-
PHL
Nonstop2h 06m
Frontier
Mon 3/27:35 am
PHL
-
ORD
Nonstop2h 36m
Frontier
Deal found 1/29$121
This Frontier deal was found by Cheapflights users on 1/28. 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 2/2310:15 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Thu 2/2612:28 pm
PHL
-
ORD
1 stop11h 11m
Frontier
Deal found 1/28$123
This Priceline deal was found by Cheapflights users on 1/27. 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.
Wed 2/187:00 am
MDW
-
PHL
1 stop9h 32m
Frontier
Wed 2/2511:40 am
PHL
-
MDW
1 stop8h 27m
Frontier
Deal found 1/27$128
This Expedia deal was found by Cheapflights users on 1/27. 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.
Tue 2/243:49 pm
STL
-
PHL
1 stop19h 33m
Frontier
Tue 3/311:03 am
PHL
-
STL
1 stop12h 24m
Frontier
Deal found 1/27$128

Find flight deals from Illinois to Delaware

Keep the following information in mind while searching for Illinois to Delaware flight deals. Data was last updated January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$98
(Frontier)

One-way from

$68
(Kiwi.com)

Popular in

March

Cheapest in

October

Average price

$234
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 Delaware
Search Deals
One-way flight from Illinois to Delaware
Search Deals
Highest demand for flights based on searches. 16% potential increase in price ($52 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 January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Delaware 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 29, 2026.
Use the filters below to find and compare flights from Illinois to Delaware that are best for you.

Fly from

Illinois

Fly to

Delaware

Route

Depart

Return

Price

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 2/24

3:49 pm-12:22 pm

1 stop19h 33m

Philadelphia

Tue 3/10

7:00 pm-10:37 am

1 stop16h 37m

$146

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 2/27

3:49 pm-9:06 am

1 stop16h 17m

Philadelphia

Fri 3/6

8:25 pm-9:49 am

1 stop14h 24m

$165

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 2/24

3:49 pm-6:15 am

2 stops13h 26m

Philadelphia

Sun 3/1

5:30 am-6:51 am

1 stop26h 21m

$180

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Sat 3/21

7:15 pm-10:10 pm

Nonstop1h 55m

Philadelphia

Tue 3/24

12:25 pm-1:40 pm

Nonstop2h 15m

$217

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Thu 4/2

6:20 pm-9:32 pm

Nonstop2h 12m

Philadelphia

Sat 4/4

4:55 pm-6:23 pm

Nonstop2h 28m

$217

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Sat 3/21

6:08 pm-9:09 pm

Nonstop2h 01m

Philadelphia

Tue 3/24

12:15 pm-1:49 pm

Nonstop2h 34m

$217

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Tue 3/31

11:27 am-10:08 pm

1 stop9h 41m

Philadelphia

Sun 4/5

5:01 am-10:30 am

1 stop6h 29m

$226

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 2/13

8:20 pm-11:18 am

1 stop13h 58m

Philadelphia

Wed 2/18

3:45 pm-10:27 pm

1 stop7h 42m

$232

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Thu 4/2

1:10 pm-7:49 pm

1 stop5h 39m

Philadelphia

Sun 4/5

6:05 am-8:53 am

1 stop3h 48m

$237

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Fri 3/13

6:34 pm-11:00 pm

1 stop3h 26m

Philadelphia

Mon 3/23

5:40 am-12:02 pm

1 stop7h 22m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 60 results
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Best time to book a flight from Illinois to Delaware

Have a flexible travel schedule? Discover the best time to fly to Delaware 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.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Delaware
No data available for this route at this time. Please check back soon.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Delaware. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to Delaware?

    A quick flight from Illinois to Delaware can take about 1h 55m. Frontier provides one of the quickest options available for as low as $217. The distance between Illinois and Delaware is about 666 mi. This flight may include one or multiple stops.

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

    To fly one-way, consider booking your trip with Qatar Airways, which is currently one of the cheapest options available, starting at $389. Etihad Airways flights start at $395 while deals on Turkish Airlines start at $404 one-way.

  • Can I find deals for flights from Illinois to Delaware that include hotel bookings?

    Yes. In addition to deals on Illinois to Delaware flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Delaware?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Delaware.

  • Can I find deals for business class flights from Illinois to Delaware?

    Yes. Cheapflights offers flight deals from Illinois to Delaware by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Alternative routes for Illinois to Delaware

See prices for flight routes from nearby airports that may be better suited for you.
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