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 $85. Frontier flights start at $86 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.

$85+ Flights from Illinois to Delaware

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Cheap flight deals from Illinois to Delaware

Most accurate provider	FlightHub 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$161 (Cheapflightsfares)
One-way from	$85 (Cheapflightsfares)
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. 32% potential increase in price ($102 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease ($13 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 abril 22, 2025.

vie. 6/208:17 pmORD - PHL

Nonstop2h 27mFrontier

dom. 6/225:45 amPHL - ORD

Nonstop2h 32mFrontier

Deal found 4/22

$161

lun. 5/1212:15 pmMDW - PHL

Nonstop2h 02mFrontier

lun. 5/194:12 pmPHL - MDW

Nonstop2h 16mFrontier

Deal found 4/21

$162

sáb. 5/246:20 pmMDW - PHL

Nonstop1h 55mSouthwest

mar. 5/276:35 pmPHL - MDW

Nonstop2h 10mSouthwest

Deal found 4/21

$169

mié. 6/257:01 amORD - PHL

Nonstop2h 02mAmerican Airlines

mar. 7/14:23 pmPHL - ORD

Nonstop2h 32mAmerican Airlines

Deal found 4/22

$169

mié. 5/218:45 amORD - PHL

Nonstop2h 08mUnited Airlines

dom. 5/256:30 amPHL - ORD

Nonstop2h 24mUnited Airlines

Deal found 4/22

$180

mié. 5/1412:41 pmORD - PHL

1 stop9h 02mMultiple Airlines

lun. 5/195:01 pmPHL - ORD

Nonstop2h 28mMultiple Airlines

Deal found 4/22

$181

sáb. 5/241:08 pmMDW - PHL

1 stop3h 28mDelta

mié. 5/2810:04 amPHL - MDW

1 stop3h 24mDelta

Deal found 4/21

$197

vie. 6/68:45 amORD - PHL

1 stop6h 52mJetBlue

vie. 6/1310:15 amPHL - ORD

1 stop6h 38mJetBlue

Deal found 4/22

$201

mié. 5/216:24 amORD - PHL

1 stop6h 36mDelta

dom. 5/251:15 pmPHL - ORD

1 stop6h 33mDelta

Deal found 4/22

$208

mié. 5/79:55 amORD - PHL

1 stop25h 57mSpirit Airlines

jue. 5/87:12 pmPHL - ORD

1 stop29h 17mSpirit Airlines

Deal found 4/21

$222

lun. 7/284:00 pmORD - PHL

1 stop6h 30mSouthwest

mié. 7/305:30 amPHL - ORD

1 stop8h 15mSouthwest

Deal found 4/22

$242

sáb. 5/1710:10 amSTL - PHL

2 stops20h 38mMultiple Airlines

lun. 5/197:06 amPHL - STL

3 stops12h 35mMultiple Airlines

Deal found 4/22

$309

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 abril 22, 2025.

vie. 6/208:17 pmORD - PHL

Nonstop2h 27mFrontier

dom. 6/225:45 amPHL - ORD

Nonstop2h 32mFrontier

Deal found 4/22

$161

sáb. 5/246:20 pmMDW - PHL

Nonstop1h 55mSouthwest

mar. 5/276:35 pmPHL - MDW

Nonstop2h 10mSouthwest

Deal found 4/21

$169

mié. 6/257:01 amORD - PHL

Nonstop2h 02mAmerican Airlines

mar. 7/14:23 pmPHL - ORD

Nonstop2h 32mAmerican Airlines

Deal found 4/22

$169

mié. 5/1412:41 pmORD - PHL

1 stop9h 02mMultiple Airlines

lun. 5/195:01 pmPHL - ORD

Nonstop2h 28mMultiple Airlines

Deal found 4/21

$176

mié. 5/218:45 amORD - PHL

Nonstop2h 08mUnited Airlines

dom. 5/258:31 amPHL - ORD

Nonstop2h 24mUnited Airlines

Deal found 4/22

$180

sáb. 5/241:08 pmMDW - PHL

1 stop3h 28mDelta

mié. 5/2810:04 amPHL - MDW

1 stop3h 24mDelta

Deal found 4/21

$197

mié. 5/149:08 pmORD - PHL

2 stops16h 54mSpirit Airlines

dom. 5/184:00 pmPHL - ORD

1 stop25h 25mSpirit Airlines

Deal found 4/21

$210

mié. 6/118:45 amORD - PHL

1 stop6h 52mJetBlue

mar. 6/1710:15 amPHL - ORD

1 stop6h 38mJetBlue

Deal found 4/22

$226

lun. 5/1212:15 pmMDW - PHL

Nonstop2h 02mFrontier

lun. 5/194:12 pmPHL - MDW

Nonstop2h 16mFrontier

Deal found 4/21

$162

mié. 5/215:30 amORD - PHL

1 stop5h 40mDelta

dom. 5/256:00 amPHL - ORD

1 stop6h 47mDelta

Deal found 4/21

$198

mar. 6/36:25 amSTL - PHL

1 stop5h 55mSouthwest

mié. 6/44:35 pmPHL - STL

2 stops7h 35mSouthwest

Deal found 4/21

$326

lun. 5/199:50 amSTL - PHL

3 stops20h 58mMultiple Airlines

lun. 5/264:00 pmPHL - STL

2 stops27h 41mMultiple Airlines

Deal found 4/20

$330

Last-minute flights from Illinois to Delaware
Discover last-minute flight deals from Illinois to Delaware. Data last updated abril 22, 2025 and is based on user searches.

mar. 4/298:25 amMDW - PHL

Nonstop2h 00mSouthwest

mar. 5/612:15 pmPHL - MDW

Nonstop2h 05mSouthwest

Deal found 4/22

$273

mar. 4/296:26 pmORD - PHL

Nonstop2h 13mUnited Airlines

mié. 4/306:41 amPHL - ORD

Nonstop2h 24mUnited Airlines

Deal found 4/22

$297

mié. 4/307:47 pmORD - PHL

1 stop11h 59mMultiple Airlines

vie. 5/25:53 pmPHL - ORD

Nonstop2h 25mMultiple Airlines

Deal found 4/21

$227

mié. 4/303:32 pmORD - PHL

2 stops31h 54mSpirit Airlines

lun. 5/57:03 pmPHL - ORD

2 stops30h 17mSpirit Airlines

Deal found 4/20

$279

mié. 4/309:52 amMDW - PHL

1 stop5h 52mDelta

mié. 5/76:00 amPHL - MDW

1 stop3h 40mDelta

Deal found 4/21

$293

mié. 4/3011:15 amORD - PHL

1 stop6h 05mDelta

mié. 5/710:04 amPHL - ORD

1 stop3h 37mDelta

Deal found 4/21

$293

jue. 5/111:51 amORD - PHL

Nonstop2h 04mAmerican Airlines

mar. 5/62:26 pmPHL - ORD

1 stop3h 36mAmerican Airlines

Deal found 4/21

$303

jue. 5/17:30 amORD - PHL

1 stop8h 30mSouthwest

sáb. 5/37:15 amPHL - ORD

2 stops10h 30mSouthwest

Deal found 4/21

$362

jue. 5/16:15 amSTL - PHL

Nonstop2h 12mAmerican Airlines

sáb. 5/311:10 amPHL - STL

Nonstop2h 39mAmerican Airlines

Deal found 4/22

$485

vie. 5/28:24 pmORD - PHL

Nonstop2h 08mFrontier

lun. 5/125:01 pmPHL - ORD

Nonstop2h 28mFrontier

Deal found 4/22

$182

vie. 5/212:15 pmMDW - PHL

Nonstop2h 02mFrontier

lun. 5/124:12 pmPHL - MDW

Nonstop2h 16mFrontier

Deal found 4/22

$202

vie. 5/29:50 amSTL - PHL

2 stops13h 19mMultiple Airlines

lun. 5/57:00 amPHL - STL

2 stops12h 41mMultiple Airlines

Deal found 4/22

$389

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 abril 22, 2025.

vie. 5/28:45 amORD - PHL

1 stop8h 16mSpirit Airlines

Deal found 4/22

$85

lun. 6/28:52 pmMDW - PHL

Nonstop2h 04mFrontier

Deal found 4/22

$86

vie. 5/98:24 pmORD - PHL

Nonstop2h 08mFrontier

Deal found 4/22

$86

sáb. 6/78:11 pmSTL - PHL

1 stop7h 59mFrontier

Deal found 4/22

$88

mar. 6/179:50 amMDW - PHL

Nonstop2h 00mSouthwest

Deal found 4/22

$89

mar. 5/278:45 pmORD - PHL

Nonstop2h 13mAmerican Airlines

Deal found 4/22

$89

mié. 5/212:30 pmORD - PHL

Nonstop2h 10mUnited Airlines

Deal found 4/21

$90

sáb. 5/2412:48 pmMDW - PHL

1 stop7h 07mDelta

Deal found 4/21

$99

sáb. 5/2411:03 amORD - PHL

1 stop6h 01mDelta

Deal found 4/22

$99

jue. 7/108:40 amORD - PHL

1 stop8h 10mJetBlue

Deal found 4/22

$111

jue. 6/54:00 pmORD - PHL

1 stop6h 30mSouthwest

Deal found 4/21

$118

mar. 7/17:46 amSTL - PHL

1 stop9h 09mAmerican Airlines

Deal found 4/22

$126

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

vie. 6/20

8:17 pm-11:44 pm

Nonstop2h 27m

Philadelphia

dom. 6/22

5:45 am-7:17 am

Nonstop2h 32m

$161

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

lun. 5/12

12:15 pm-3:17 pm

Nonstop2h 02m

Philadelphia

lun. 5/19

4:12 pm-5:28 pm

Nonstop2h 16m

$162

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

sáb. 5/24

6:20 pm-9:15 pm

Nonstop1h 55m

Philadelphia

mar. 5/27

6:35 pm-7:45 pm

Nonstop2h 10m

$169

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

mié. 6/25

7:01 am-10:03 am

Nonstop2h 02m

Philadelphia

mar. 7/1

4:23 pm-5:55 pm

Nonstop2h 32m

$169

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

mié. 5/21

8:45 am-11:53 am

Nonstop2h 08m

Philadelphia

dom. 5/25

6:30 am-7:54 am

Nonstop2h 24m

$180

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

mié. 5/14

12:41 pm-10:43 pm

1 stop9h 02m

Philadelphia

dom. 5/18

7:15 am-8:43 am

Nonstop2h 28m

$181

ChicagoPhiladelphia

MDW - PHL

MDWPHL

Chicago Midway

sáb. 5/24

1:08 pm-5:36 pm

1 stop3h 28m

Philadelphia

mié. 5/28

10:04 am-12:28 pm

1 stop3h 24m

$197

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

vie. 6/6

8:45 am-4:37 pm

1 stop6h 52m

Philadelphia

vie. 6/13

10:15 am-3:53 pm

1 stop6h 38m

$201

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

mié. 5/21

6:24 am-2:00 pm

1 stop6h 36m

Philadelphia

dom. 5/25

1:15 pm-6:48 pm

1 stop6h 33m

$208

ChicagoPhiladelphia

ORD - PHL

ORDPHL

Chicago O'Hare Intl

mié. 5/7

9:55 am-12:52 pm

1 stop25h 57m

Philadelphia

jue. 5/8

7:12 pm-11:29 pm

1 stop29h 17m

$222

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/22

Showing 1-10 of 60 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

9,911 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Alaska Airlines

8.0

Very good

9,911 reviews

Alaska Airlines

8.0

Very good

9,911 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Southwest

8.0

Very good

4,287 reviews

Alaska Airlines

8.0

Very good

9,911 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

Delta

8.0

Very good

7,920 reviews

Alaska Airlines

8.0

Very good

9,911 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

United Airlines

7.4

Good

8,683 reviews

Alaska Airlines

8.0

Very good

9,911 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

JetBlue

7.3

Good

2,923 reviews

Alaska Airlines

8.0

Very good

9,911 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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 $85. Frontier flights start at $86 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%

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$85+ 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 5/2. 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 abril 22, 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 abril 22, 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 abril 22, 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 abril 22, 2025.