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Delaware

$67+ 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 2/10. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ILG
Feb 17 — Feb 241
Tue 2/17
Tue 2/24
1 adult, Economy
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Cheap 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 18, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$108
(Frontier)

One-way from

$67
(Kiwi.com)

Popular in

March

Cheapest in

October

Average price

$221
Provider with most accurate pricing for Chicago (CHI)-Philadelphia flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Philadelphia flights.
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From Illinois to Delaware
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One-way flight from Illinois to Delaware
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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 ($8 potential savings vs. average RT price).
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Average for round-trip flights in January 2026
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Find 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 18, 2026.

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.
Fri 1/304:44 pm
ORD
-
PHL
Nonstop2h 15m
Frontier
Fri 2/69:09 pm
PHL
-
ORD
Nonstop2h 40m
Frontier
Deal found 1/16$108
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/23:22 pm
ORD
-
PHL
Nonstop2h 15m
Frontier
Fri 2/69:09 pm
PHL
-
ORD
Nonstop2h 40m
Frontier
Deal found 1/17$117
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/64:44 pm
ORD
-
PHL
Nonstop2h 15m
Frontier
Mon 2/97:47 pm
PHL
-
ORD
Nonstop2h 40m
Frontier
Deal found 1/17$118
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/79:38 am
MDW
-
PHL
1 stop8h 35m
Frontier
Tue 2/2411:40 am
PHL
-
MDW
1 stop8h 27m
Frontier
Deal found 1/15$128
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.
Thu 3/123:21 pm
ORD
-
PHL
Nonstop2h 09m
Frontier
Thu 3/1912:45 pm
PHL
-
ORD
Nonstop2h 36m
Frontier
Deal found 1/16$128
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.
Thu 3/123:21 pm
ORD
-
PHL
Nonstop2h 09m
Frontier
Sun 3/1512:45 pm
PHL
-
ORD
Nonstop2h 36m
Frontier
Deal found 1/16$129
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.
Fri 2/207:45 am
MDW
-
PHL
1 stop25h 57m
Frontier
Mon 2/235:30 am
PHL
-
MDW
1 stop15h 17m
Frontier
Deal found 1/16$133
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.
Fri 2/138:20 am
ORD
-
PHL
Nonstop2h 09m
Frontier
Mon 2/169:47 pm
PHL
-
ORD
Nonstop2h 36m
Frontier
Deal found 1/16$133
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.
Wed 2/183:49 pm
STL
-
PHL
1 stop29h 04m
Frontier
Tue 2/246:40 pm
PHL
-
STL
1 stop13h 11m
Frontier
Deal found 1/17$134
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.
Wed 2/48:10 am
ORD
-
PHL
1 stop6h 27m
Frontier
Fri 2/69:09 pm
PHL
-
ORD
Nonstop2h 40m
Frontier
Deal found 1/16$134
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.
Tue 2/176:00 am
MDW
-
PHL
1 stop27h 24m
Frontier
Wed 2/256:40 pm
PHL
-
MDW
1 stop22h 36m
Frontier
Deal found 1/17$135
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/304:44 pm
ORD
-
PHL
Nonstop2h 15m
Frontier
Mon 2/27:47 pm
PHL
-
ORD
Nonstop2h 40m
Frontier
Deal found 1/17$137

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 18, 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

Sat 2/28

3:49 pm-7:32 am

1 stop14h 43m

Philadelphia

Mon 3/2

6:18 pm-10:27 pm

1 stop29h 09m

$144

St. LouisPhiladelphia

STL - PHL

STLPHL

Lambert-St Louis

Fri 2/20

8:20 pm-11:18 am

1 stop13h 58m

Philadelphia

Mon 2/23

7:18 pm-3:53 pm

2 stops45h 35m

$165

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Fri 2/6

11:20 am-2:31 pm

Nonstop2h 11m

Philadelphia

Sun 2/8

10:10 am-11:38 am

Nonstop2h 28m

$217

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Fri 3/13

6:08 pm-9:09 pm

Nonstop2h 01m

Philadelphia

Mon 3/23

5:10 pm-6:43 pm

Nonstop2h 33m

$217

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Tue 3/3

7:30 am-5:12 pm

1 stop8h 42m

Philadelphia

Tue 3/10

8:06 am-6:13 pm

2 stops11h 07m

$218

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Sat 4/4

5:40 pm-10:50 pm

1 stop4h 10m

Philadelphia

Mon 4/6

7:05 pm-8:25 pm

Nonstop2h 20m

$227

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Wed 4/1

3:35 pm-10:40 pm

1 stop6h 05m

Philadelphia

Mon 4/6

7:05 pm-8:25 pm

Nonstop2h 20m

$227

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Sat 3/14

6:34 pm-11:00 pm

1 stop3h 26m

Philadelphia

Sun 3/15

5:40 am-9:56 am

1 stop5h 16m

$237

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Thu 3/26

9:35 am-4:33 pm

1 stop5h 58m

Philadelphia

Tue 3/31

12:26 pm-5:54 pm

1 stop6h 28m

$237

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Tue 3/24

12:47 pm-8:52 pm

1 stop7h 05m

Philadelphia

Tue 3/31

10:28 am-4:55 pm

1 stop7h 27m

$237

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 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 2h 11m. Frontier provides one of the quickest options available for as low as $217. The distance between Illinois and Delaware is about 676 mi. This flight may include one or multiple stops.

  • 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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