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

To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $84. Frontier flights start at $85 while deals on Southwest start at $89 one-way.

How far in advance should I book a flight from Illinois to Delaware?

To save up to 38% on this flight, we recommend booking at least 39 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Illinois to Delaware from $121 1-2 weeks out and tickets from $214 for flights departing within the next 72 hours.

What is the cheapest month to fly from Illinois to Delaware?

August can be a great time to fly to Delaware from Illinois with a flight ticket averaging about $218. Cheapflights users have found deals in the month of August for as cheap as $51. The most expensive prices can be found in the month of March.

What is the cheapest time of day to fly from IL to DE?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Delaware as you normally would.

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.

$84+ Flights from Illinois to Delaware

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Illinois to Delaware with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Illinois to Delaware

Most accurate provider	CheapOair 3 stars
Most trusted provider	CheapOair 3 stars
Round-trip from	$161 (Cheapflightsfares)
One-way from	$84 (Mytrip)
Popular in	March
Cheapest in	August
Average price	$268

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. 31% potential increase in price ($102 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease ($12 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

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 April 30, 2025.

Fri 6/208:17 pmORD - PHL

Nonstop2h 27mFrontier

Sun 6/225:45 amPHL - ORD

Nonstop2h 32mFrontier

Deal found 4/28

$161

Wed 8/68:00 amORD - PHL

1 stop10h 01mMultiple Airlines

Mon 8/115:48 pmPHL - ORD

Nonstop2h 39mMultiple Airlines

Deal found 4/29

$166

Tue 7/15:00 amORD - PHL

Nonstop1h 56mAmerican Airlines

Tue 7/84:25 pmPHL - ORD

Nonstop2h 30mAmerican Airlines

Deal found 4/29

$169

Mon 6/27:40 amMDW - PHL

1 stop7h 40mFrontier

Mon 6/26:35 pmPHL - MDW

Nonstop2h 17mFrontier

Deal found 4/29

$175

Mon 5/197:47 amORD - PHL

1 stop23h 01mSpirit Airlines

Tue 5/275:45 amPHL - ORD

1 stop28h 05mSpirit Airlines

Deal found 4/27

$188

Fri 6/279:15 pmMDW - PHL

Nonstop2h 00mSouthwest

Tue 7/15:55 amPHL - MDW

Nonstop2h 05mSouthwest

Deal found 4/29

$189

Fri 6/279:23 pmORD - PHL

Nonstop2h 07mUnited Airlines

Tue 7/15:11 pmPHL - ORD

Nonstop2h 24mUnited Airlines

Deal found 4/28

$189

Sat 6/149:40 amORD - PHL

1 stop8h 00mJetBlue

Tue 6/1710:15 amPHL - ORD

1 stop6h 38mJetBlue

Deal found 4/29

$201

Tue 5/207:10 amORD - PHL

1 stop3h 50mDelta

Sun 5/251:15 pmPHL - ORD

1 stop6h 33mDelta

Deal found 4/28

$208

Tue 5/206:00 amMDW - PHL

1 stop5h 10mDelta

Wed 5/216:00 amPHL - MDW

1 stop8h 15mDelta

Deal found 4/29

$219

Fri 6/64:00 pmORD - PHL

1 stop6h 30mSouthwest

Mon 6/95:30 amPHL - ORD

2 stops10h 30mSouthwest

Deal found 4/29

$262

Wed 7/2311:45 amSTL - PHL

1 stop5h 40mSouthwest

Tue 7/295:30 amPHL - STL

2 stops8h 05mSouthwest

Deal found 4/29

$326

Best flights from Illinois to Delaware
Discover carefully curated flight deals from Illinois to Delaware that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 30, 2025.

Fri 6/208:17 pmORD - PHL

Nonstop2h 27mFrontier

Sun 6/225:45 amPHL - ORD

Nonstop2h 32mFrontier

Deal found 4/28

$161

Sat 5/246:20 pmMDW - PHL

Nonstop1h 55mSouthwest

Wed 5/2812:15 pmPHL - MDW

Nonstop2h 05mSouthwest

Deal found 4/28

$169

Fri 7/45:00 amORD - PHL

Nonstop1h 56mAmerican Airlines

Tue 7/84:25 pmPHL - ORD

Nonstop2h 30mAmerican Airlines

Deal found 4/29

$169

Sat 6/712:41 pmORD - PHL

1 stop9h 02mMultiple Airlines

Mon 6/94:28 pmPHL - ORD

Nonstop2h 36mMultiple Airlines

Deal found 4/28

$171

Mon 5/197:47 amORD - PHL

1 stop23h 01mSpirit Airlines

Tue 5/275:45 amPHL - ORD

1 stop28h 05mSpirit Airlines

Deal found 4/27

$188

Thu 6/269:23 pmORD - PHL

Nonstop2h 07mUnited Airlines

Tue 7/15:11 pmPHL - ORD

Nonstop2h 24mUnited Airlines

Deal found 4/29

$189

Fri 6/138:40 amORD - PHL

1 stop8h 55mJetBlue

Sun 6/1510:15 amPHL - ORD

1 stop7h 26mJetBlue

Deal found 4/29

$201

Tue 5/207:10 amORD - PHL

1 stop3h 50mDelta

Sun 5/251:15 pmPHL - ORD

1 stop6h 33mDelta

Deal found 4/28

$208

Mon 7/286:40 pmMDW - PHL

Nonstop2h 05mFrontier

Fri 8/110:38 pmPHL - MDW

Nonstop2h 13mFrontier

Deal found 4/28

$171

Tue 5/206:00 amMDW - PHL

1 stop5h 10mDelta

Wed 5/216:00 amPHL - MDW

1 stop8h 15mDelta

Deal found 4/28

$219

Fri 6/64:00 pmORD - PHL

1 stop6h 30mSouthwest

Mon 6/95:30 amPHL - ORD

2 stops10h 30mSouthwest

Deal found 4/28

$262

Wed 7/95:14 pmSTL - PHL

Nonstop2h 11mAmerican Airlines

Wed 7/234:25 pmPHL - STL

1 stop4h 54mAmerican Airlines

Deal found 4/27

$311

Last-minute flights from Illinois to Delaware
Discover last-minute flight deals from Illinois to Delaware. Data last updated April 30, 2025 and is based on user searches.

Mon 5/512:58 pmORD - PHL

Nonstop2h 08mFrontier

Mon 5/125:01 pmPHL - ORD

Nonstop2h 28mFrontier

Deal found 4/28

$182

Mon 5/54:00 pmORD - PHL

1 stop5h 15mSouthwest

Thu 5/85:00 amPHL - ORD

1 stop12h 45mSouthwest

Deal found 4/28

$314

Tue 5/66:00 amSTL - PHL

Nonstop2h 11mAmerican Airlines

Thu 5/87:14 pmPHL - STL

Nonstop2h 44mAmerican Airlines

Deal found 4/29

$485

Wed 5/79:55 amORD - PHL

1 stop25h 57mSpirit Airlines

Sat 5/177:45 amPHL - ORD

1 stop23h 57mSpirit Airlines

Deal found 4/29

$280

Wed 5/712:41 pmORD - PHL

1 stop9h 02mMultiple Airlines

Sun 5/117:15 amPHL - ORD

Nonstop2h 28mMultiple Airlines

Deal found 4/28

$302

Wed 5/79:16 amMDW - PHL

1 stop5h 33mDelta

Sat 5/176:00 amPHL - MDW

1 stop3h 40mDelta

Deal found 4/29

$313

Thu 5/88:30 amMDW - PHL

1 stop23h 29mFrontier

Fri 5/94:12 pmPHL - MDW

Nonstop2h 16mFrontier

Deal found 4/29

$191

Thu 5/89:50 amSTL - PHL

2 stops28h 12mMultiple Airlines

Mon 5/127:06 amPHL - STL

3 stops12h 35mMultiple Airlines

Deal found 4/28

$332

Fri 5/95:50 amMDW - PHL

Nonstop1h 55mSouthwest

Tue 5/136:30 amPHL - MDW

Nonstop2h 10mSouthwest

Deal found 4/29

$293

Fri 5/98:45 amORD - PHL

Nonstop2h 08mUnited Airlines

Tue 5/135:01 pmPHL - ORD

Nonstop2h 24mUnited Airlines

Deal found 4/29

$293

Fri 5/95:40 pmORD - PHL

Nonstop2h 00mAmerican Airlines

Wed 5/142:26 pmPHL - ORD

1 stop3h 36mAmerican Airlines

Deal found 4/29

$303

Fri 5/99:39 amORD - PHL

1 stop7h 35mDelta

Tue 5/135:00 pmPHL - ORD

1 stop4h 21mDelta

Deal found 4/29

$313

One-way flights from Illinois to Delaware
Search for one-way flight options from Illinois to Delaware. Find affordable one-way fares based on user searches. Data last updated April 30, 2025.

Wed 6/47:37 amORD - PHL

1 stop13h 59mSpirit Airlines

Deal found 4/28

$84

Mon 7/76:40 pmMDW - PHL

Nonstop2h 05mFrontier

Deal found 4/27

$85

Thu 6/198:24 amORD - PHL

Nonstop2h 19mFrontier

Deal found 4/29

$85

Tue 6/248:30 pmMDW - PHL

Nonstop1h 55mSouthwest

Deal found 4/28

$89

Wed 5/289:45 amORD - PHL

Nonstop1h 57mAmerican Airlines

Deal found 4/28

$89

Tue 7/14:00 pmORD - PHL

1 stop6h 14mUnited Airlines

Deal found 4/28

$91

Wed 5/285:45 pmSTL - PHL

1 stop12h 55mFrontier

Deal found 4/29

$95

Sat 5/241:08 pmMDW - PHL

1 stop3h 28mDelta

Deal found 4/29

$99

Sat 5/241:30 pmORD - PHL

1 stop6h 25mDelta

Deal found 4/28

$99

Tue 8/198:40 amORD - PHL

1 stop8h 10mJetBlue

Deal found 4/28

$136

Tue 7/297:37 pmSTL - PHL

1 stop13h 08mSpirit Airlines

Deal found 4/29

$136

Thu 6/59:50 amSTL - PHL

2 stops28h 12mMultiple Airlines

Deal found 4/28

$144

Cheapflights Fare Finder

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

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Fri 6/20

8:17 pm-11:44 pm

Nonstop2h 27m

Philadelphia

Sun 6/22

5:45 am-7:17 am

Nonstop2h 32m

$161

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 6/10

12:41 pm-10:43 pm

1 stop9h 02m

Philadelphia

Thu 6/12

5:45 am-7:17 am

Nonstop2h 32m

$166

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 7/1

5:00 am-7:56 am

Nonstop1h 56m

Philadelphia

Tue 7/8

4:25 pm-5:55 pm

Nonstop2h 30m

$169

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Mon 6/2

7:40 am-4:20 pm

1 stop7h 40m

Philadelphia

Mon 6/2

6:35 pm-7:52 pm

Nonstop2h 17m

$175

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Mon 5/19

7:47 am-7:48 am

1 stop23h 01m

Philadelphia

Tue 5/27

5:45 am-8:50 am

1 stop28h 05m

$188

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Fri 6/27

9:15 pm-12:15 am

Nonstop2h 00m

Philadelphia

Tue 7/1

5:55 am-7:00 am

Nonstop2h 05m

$189

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Fri 6/27

9:23 pm-12:30 am

Nonstop2h 07m

Philadelphia

Tue 7/1

5:11 pm-6:35 pm

Nonstop2h 24m

$189

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Sat 6/14

9:40 am-6:40 pm

1 stop8h 00m

Philadelphia

Tue 6/17

10:15 am-3:53 pm

1 stop6h 38m

$201

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

Tue 5/20

7:10 am-12:00 pm

1 stop3h 50m

Philadelphia

Sun 5/25

1:15 pm-6:48 pm

1 stop6h 33m

$208

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

Tue 5/20

6:00 am-12:10 pm

1 stop5h 10m

Philadelphia

Tue 5/20

4:58 pm-9:27 pm

1 stop5h 29m

$219

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 57 results

...

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

Rainfall in Delaware by month

In terms of precipitation, rainfall in Delaware ranges from 2.9 - 4.3 inches per month. July is typically the wettest month, when rainfall can reach 4.3 in. February is typically the driest time to visit Delaware when rainfall is around 2.9 in.

Temperature in Delaware by month

If weather is an important factor for your trip to Delaware, 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 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing Delaware

Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Illinois to Delaware. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Alaska Airlines

8.0

Very good

9,961 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Southwest

8.0

Very good

4,295 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Delta

8.0

Very good

7,936 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

United Airlines

7.4

Good

8,696 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

JetBlue

7.3

Good

2,922 reviews

Alaska Airlines

8.0

Very good

9,961 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

What are the cheapest airlines to fly from Illinois to Delaware one-way?
To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $84. Frontier flights start at $85 while deals on Southwest start at $89 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

Browse thousands of different options on Cheapflights for your next trip

Top airline flying from Illinois to Delaware

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$181	Average$181	FlexibilityNo cancel fee	On-time71%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$84+ 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 5/15. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Illinois to Delaware with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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 April 30, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Illinois to Delaware

Cheapest flights from Illinois to DelawareExplore 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 April 30, 2025.

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 April 30, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to Delaware that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Delaware

Rainfall in Delaware by month

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

Temperature in Delaware by month

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

Reviews of airlines servicing Delaware

Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Illinois to Delaware. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

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.

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

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

How can I find direct flights from Illinois to Delaware?

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Delaware

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

Top airline flying from Illinois to Delaware

100% Free

Book with Flexibility

Travel Smart

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 April 30, 2025.