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Delaware

$70+ 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 4/25. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — ILG
Apr 23 — Apr 301
Thu 4/23
Thu 4/30
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 March 24, 2026.

This Expedia deal was found by Cheapflights users on 3/24. 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 5/18:23 pm
STL
-
PHL
1 stop10h 47m
Frontier
Fri 5/88:35 pm
PHL
-
STL
1 stop23h 48m
Frontier
Deal found 3/24$140
This Booking.com deal was found by Cheapflights users on 3/23. 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 5/43:21 pm
STL
-
PHL
1 stop7h 38m
Frontier
Wed 5/68:35 pm
PHL
-
STL
1 stop23h 48m
Frontier
Deal found 3/23$147
This CheapOair deal was found by Cheapflights users on 3/21. 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 5/48:17 pm
STL
-
PHL
1 stop8h 17m
Frontier
Fri 5/88:35 pm
PHL
-
STL
1 stop23h 48m
Frontier
Deal found 3/21$151
This Frontier deal was found by Cheapflights users on 3/23. 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 4/3011:21 am
STL
-
PHL
1 stop6h 58m
Frontier
Sun 5/106:10 pm
PHL
-
STL
1 stop7h 11m
Frontier
Deal found 3/23$160
This Booking.com deal was found by Cheapflights users on 3/21. 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 5/118:08 pm
STL
-
PHL
1 stop8h 29m
Frontier
Fri 5/1510:11 am
PHL
-
STL
1 stop15h 10m
Frontier
Deal found 3/21$167
This CheapOair deal was found by Cheapflights users on 3/24. 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 4/88:16 pm
STL
-
PHL
1 stop8h 15m
Frontier
Wed 4/158:41 pm
PHL
-
STL
1 stop23h 40m
Frontier
Deal found 3/24$171
This Expedia deal was found by Cheapflights users on 3/23. 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.
Mon 5/118:08 pm
STL
-
PHL
1 stop8h 29m
Frontier
Thu 5/149:16 pm
PHL
-
STL
1 stop28h 05m
Frontier
Deal found 3/23$181
This Frontier deal was found by Cheapflights users on 3/22. 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 5/307:52 pm
ORD
-
PHL
Nonstop2h 26m
Frontier
Mon 6/15:06 pm
PHL
-
ORD
Nonstop2h 38m
Frontier
Deal found 3/22$182
This Southwest deal was found by Cheapflights users on 3/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/148:00 am
MDW
-
PHL
2 stops7h 50m
Southwest
Tue 4/216:45 pm
PHL
-
MDW
1 stop4h 30m
Southwest
Deal found 3/24$184
This Frontier deal was found by Cheapflights users on 3/23. 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.
Sun 4/192:37 pm
ORD
-
PHL
Nonstop2h 14m
Frontier
Wed 4/2211:02 am
PHL
-
ORD
1 stop6h 58m
Frontier
Deal found 3/23$184
This Expedia deal was found by Cheapflights users on 3/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/268:05 am
ORD
-
PHL
1 stop15h 39m
Frontier
Fri 5/291:32 pm
PHL
-
ORD
1 stop7h 19m
Frontier
Deal found 3/20$185
This Frontier deal was found by Cheapflights users on 3/23. 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.
Tue 5/126:51 pm
STL
-
PHL
1 stop11h 01m
Frontier
Sun 5/246:10 am
PHL
-
STL
1 stop9h 38m
Frontier
Deal found 3/23$185

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 March 24, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$140
(Frontier)

One-way from

$70
(Frontier)

Popular in

March

Cheapest in

October

Average price

$369
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. 17% potential increase in price ($56 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 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 March 24, 2026.
Use the filters below to find and compare flights from Illinois to Delaware that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Thu 4/23

9:55 pm-12:59 am

Nonstop2h 04m

Philadelphia

Sat 4/25

5:00 pm-6:28 pm

Nonstop2h 28m

$193

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Thu 4/23

9:55 pm-12:59 am

Nonstop2h 04m

Philadelphia

Sun 4/26

6:04 am-7:32 am

Nonstop2h 28m

$215

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Fri 5/1

6:45 pm-9:45 pm

Nonstop2h 00m

Philadelphia

Mon 5/4

6:00 pm-7:10 pm

Nonstop2h 10m

$227

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Thu 5/7

9:00 am-4:45 pm

1 stop6h 45m

Philadelphia

Thu 5/14

5:25 pm-12:05 am

1 stop7h 40m

$236
Quickest round-trip

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Thu 4/23

7:40 am-10:35 am

Nonstop1h 55m

Philadelphia

Mon 4/27

2:15 pm-3:25 pm

Nonstop2h 10m

$237

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Thu 4/30

9:59 pm-12:59 am

Nonstop2h 00m

Philadelphia

Sat 5/2

6:10 am-7:39 am

Nonstop2h 29m

$237

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 4/28

9:04 am-12:17 pm

Nonstop2h 13m

Philadelphia

Wed 4/29

11:36 am-1:04 pm

Nonstop2h 28m

$237

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Mon 5/11

9:54 pm-12:59 am

Nonstop2h 05m

Philadelphia

Tue 5/12

5:05 pm-6:34 pm

Nonstop2h 29m

$237

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Wed 6/3

6:35 am-9:39 am

Nonstop2h 04m

Philadelphia

Sat 6/13

6:45 pm-8:18 pm

Nonstop2h 33m

$247

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 9/8

9:06 am-12:23 pm

Nonstop2h 17m

Philadelphia

Sat 9/12

6:44 pm-8:12 pm

Nonstop2h 28m

$247

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/24

Showing 1-10 of 60 resultsSorted by cheapest first
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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. United Airlines provides one of the quickest options available for as low as $227. The distance between Illinois and Delaware is about 666 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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