What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Illinois one-way?

For one-way options, check prices for Allegiant Air. According to our data, you can fly for as low as $89. Users have also found prices from $91 and $94 on Frontier and United Airlines, respectively.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

What are the most popular routes from Washington, D.C. Dulles Intl Airport to Illinois?

The most popular route from Washington, D.C. Dulles Intl Airport to Illinois is Washington, D.C. Dulles Intl - Chicago O'Hare Intl. You may also consider Washington, D.C. Dulles Intl - Chicago Midway or Washington, D.C. Dulles Intl - Lambert-St Louis.

What are the cheapest flights from Washington, D.C. Dulles Intl Airport to Illinois?

Looking for the cheapest flight from Washington, D.C. Dulles Intl Airport to Illinois? While on average our users pay $1,584, our data indicates the cheapest price to be $114. The most popular route (Washington, D.C. Dulles Intl - Chicago O'Hare Intl), is priced around $93.

What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to Illinois?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Dulles Intl Airport to Illinois on time: Egyptair (88%), Ethiopian Air (80%), Air China (79%).

What are the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to Illinois?

Consider American Airlines, Delta or Frontier when booking your flight. These represent the most popular airlines when flying from Washington, D.C. Dulles Intl Airport to Illinois.

How far in advance should I book a flight from Washington, D.C. Dulles Intl Airport to Illinois?

Find a great deal and save up to 73% by booking at least 31 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Washington, D.C. Dulles Intl Airport to Illinois within the next two weeks, with the cheapest ticket starting at $260.

What is the cheapest month to fly from Washington, D.C. Dulles Intl Airport to Illinois?

The best pricing can be found in the month of September. Prices to Illinois from Washington, D.C. Dulles Intl Airport average $252. You can even find prices in September for less than $252, as users have found deals to Illinois from as low as $68. The month of April appears to be one of the more expensive times to travel to Illinois from Washington, D.C. Dulles Intl Airport. Flying in the targeted month can save you up to 8%.

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

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

How can I find direct flights from Dulles Intl to Illinois?

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

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

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

$87+ Flights from Washington, D.C. Dulles Intl Airport to Illinois

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

Find cheap flights from Dulles Intl to Illinois 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 Dulles Intl to Illinois

Round-trip from	$143 (United Airlines)
One-way from	$89 (Mytrip)
Popular in	April
Cheapest in	September
Average price	$263
Good round-trip deal	$301 or less
Good one-way deal	$168 or less

From Washington, D.C. Dulles Intl to Illinois

Search Deals

One-way flight from Washington, D.C. Dulles Intl to Illinois

Search Deals

Highest demand for flights based on searches. 6% potential increase in price ($17 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in July 2025

Search Deals

Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Illinois.

Search Deals

Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Illinois.

Search Deals

Find flight deals from Dulles Intl to Illinois

Cheapest flights from Dulles Intl to Illinois
Explore the most affordable flight options available from Dulles Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 11, 2025.

Thu 9/1110:10 pmIAD - ORD

Nonstop2h 05mUnited Airlines

Sun 9/148:50 amORD - IAD

Nonstop2h 05mUnited Airlines

Deal found 7/10

$143

Thu 8/216:10 amIAD - ORD

1 stop5h 29mFrontier

Sat 8/236:00 amORD - IAD

1 stop9h 30mFrontier

Deal found 7/10

$154

Thu 8/215:18 pmIAD - MDW

1 stop6h 50mFrontier

Mon 8/256:15 amMDW - IAD

1 stop9h 15mFrontier

Deal found 7/10

$154

Mon 8/181:22 pmIAD - MDW

1 stop5h 55mAllegiant Air

Mon 8/259:32 amMDW - IAD

1 stop4h 51mAllegiant Air

Deal found 7/8

$180

Sat 8/236:10 amIAD - STL

1 stop8h 23mFrontier

Sun 8/2410:17 amSTL - IAD

1 stop22h 10mFrontier

Deal found 7/10

$190

Sat 8/238:40 amIAD - STL

Nonstop2h 22mUnited Airlines

Mon 8/259:17 amSTL - IAD

1 stop5h 35mUnited Airlines

Deal found 7/9

$194

Tue 8/126:00 amIAD - STL

1 stop4h 57mDelta

Fri 8/156:00 pmSTL - IAD

1 stop3h 55mDelta

Deal found 7/10

$197

Tue 8/55:20 pmIAD - ORD

1 stop7h 49mDelta

Fri 8/87:10 amORD - IAD

1 stop3h 22mDelta

Deal found 7/10

$197

Tue 8/56:00 amIAD - MDW

1 stop3h 44mDelta

Wed 8/136:04 amMDW - IAD

1 stop4h 40mDelta

Deal found 7/10

$197

Thu 8/214:56 pmIAD - ORD

2 stops24h 14mMultiple Airlines

Sat 8/2311:36 amORD - IAD

2 stops22h 08mMultiple Airlines

Deal found 7/10

$203

Fri 8/151:22 pmIAD - MDW

1 stop5h 55mMultiple Airlines

Tue 8/199:16 amMDW - IAD

1 stop11h 18mMultiple Airlines

Deal found 7/7

$222

Sat 8/2312:39 pmIAD - MLI

1 stop4h 40mDelta

Sat 9/66:00 amMLI - IAD

1 stop4h 23mDelta

Deal found 7/10

$249

Best flights from Dulles Intl to Illinois
Discover carefully curated flight deals from Dulles Intl to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 11, 2025.

Thu 9/1110:10 pmIAD - ORD

Nonstop2h 05mUnited Airlines

Sun 9/148:50 amORD - IAD

Nonstop2h 05mUnited Airlines

Deal found 7/10

$143

Thu 8/216:10 amIAD - ORD

1 stop5h 29mFrontier

Sat 8/236:00 amORD - IAD

1 stop9h 30mFrontier

Deal found 7/10

$154

Mon 8/181:22 pmIAD - MDW

1 stop5h 55mAllegiant Air

Mon 8/259:32 amMDW - IAD

1 stop4h 51mAllegiant Air

Deal found 7/8

$180

Tue 8/1212:39 pmIAD - STL

1 stop7h 28mDelta

Wed 8/139:17 amSTL - IAD

1 stop6h 13mDelta

Deal found 7/10

$197

Thu 8/214:56 pmIAD - ORD

2 stops24h 14mMultiple Airlines

Sat 8/2311:36 amORD - IAD

2 stops22h 08mMultiple Airlines

Deal found 7/10

$203

Sat 8/236:34 amIAD - MLI

2 stops11h 24mAmerican Airlines

Wed 9/38:19 amMLI - IAD

1 stop4h 32mAmerican Airlines

Deal found 7/9

$254

Thu 9/41:41 pmIAD - MDW

1 stop10h 39mFrontier

Mon 9/86:20 amMDW - IAD

1 stop5h 26mFrontier

Deal found 7/10

$154

Sat 8/238:40 amIAD - STL

Nonstop2h 22mUnited Airlines

Mon 8/259:17 amSTL - IAD

1 stop5h 35mUnited Airlines

Deal found 7/9

$194

Tue 8/55:20 pmIAD - ORD

1 stop7h 49mDelta

Fri 8/87:10 amORD - IAD

1 stop3h 22mDelta

Deal found 7/10

$197

Fri 8/82:44 pmIAD - STL

1 stop24h 15mFrontier

Sun 8/107:59 pmSTL - IAD

1 stop13h 08mFrontier

Deal found 7/9

$196

Tue 8/56:00 amIAD - MDW

1 stop3h 44mDelta

Wed 8/136:04 amMDW - IAD

1 stop4h 40mDelta

Deal found 7/10

$197

Fri 8/151:22 pmIAD - MDW

1 stop5h 55mMultiple Airlines

Tue 8/199:16 amMDW - IAD

1 stop11h 18mMultiple Airlines

Deal found 7/7

$222

Last-minute flights from Dulles Intl to Illinois
Discover last-minute flight deals from Dulles Intl to Illinois. Data last updated July 11, 2025 and is based on user searches.

Tue 7/156:10 amIAD - MDW

1 stop5h 30mFrontier

Wed 7/1611:39 amMDW - IAD

1 stop11h 33mFrontier

Deal found 7/8

$254

Tue 7/151:00 pmIAD - STL

1 stop5h 08mDelta

Tue 7/226:04 pmSTL - IAD

1 stop3h 51mDelta

Deal found 7/8

$504

Wed 7/163:37 pmIAD - MLI

1 stop7h 42mDelta

Wed 7/235:55 amMLI - IAD

1 stop4h 55mDelta

Deal found 7/9

$284

Thu 7/1711:58 amIAD - ORD

2 stops12h 55mMultiple Airlines

Wed 8/135:16 pmORD - IAD

2 stops15h 58mMultiple Airlines

Deal found 7/9

$310

Thu 7/1711:58 amIAD - STL

2 stops7h 43mMultiple Airlines

Sun 7/2010:47 amSTL - IAD

3 stops26h 36mMultiple Airlines

Deal found 7/9

$398

Fri 7/1810:07 pmIAD - ORD

1 stop10h 58mUnited Airlines

Sat 7/1910:50 amORD - IAD

Nonstop1h 59mUnited Airlines

Deal found 7/9

$279

Fri 7/188:06 pmIAD - STL

1 stop4h 53mAmerican Airlines

Mon 7/214:28 pmSTL - IAD

1 stop6h 30mAmerican Airlines

Deal found 7/8

$469

Sat 7/194:17 pmIAD - ORD

1 stop8h 12mFrontier

Sun 7/275:01 amORD - IAD

1 stop7h 48mFrontier

Deal found 7/8

$239

Sat 7/1912:46 pmIAD - ORD

1 stop5h 29mSun Country Air

Wed 7/2312:20 pmORD - IAD

1 stop22h 23mSun Country Air

Deal found 7/10

$345

Sat 7/193:39 pmIAD - MLI

1 stop6h 58mUnited Airlines

Mon 7/215:20 pmMLI - IAD

1 stop6h 10mUnited Airlines

Deal found 7/10

$379

Sat 7/198:40 amIAD - STL

Nonstop2h 19mUnited Airlines

Mon 7/218:15 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 7/7

$449

Sun 7/206:10 amIAD - STL

1 stop8h 24mFrontier

Sat 7/262:52 pmSTL - IAD

1 stop7h 27mFrontier

Deal found 7/9

$212

One-way flights from Dulles Intl to Illinois
Search for one-way flight options from Dulles Intl to Illinois. Find affordable one-way fares based on user searches. Data last updated July 11, 2025.

Fri 9/53:19 pmIAD - MDW

1 stop4h 41mAllegiant Air

Deal found 7/9

$89

Sat 7/191:37 pmIAD - MDW

1 stop7h 45mFrontier

Deal found 7/8

$91

Sat 8/164:07 pmIAD - ORD

1 stop8h 22mFrontier

Deal found 7/9

$93

Sat 8/2310:10 pmIAD - ORD

Nonstop2h 05mUnited Airlines

Deal found 7/9

$94

Thu 8/711:58 amIAD - ORD

2 stops13h 00mMultiple Airlines

Deal found 7/8

$96

Thu 8/146:00 amIAD - STL

1 stop4h 57mDelta

Deal found 7/8

$99

Sun 8/246:00 amIAD - ORD

1 stop5h 20mDelta

Deal found 7/10

$99

Thu 9/46:00 amIAD - MDW

1 stop3h 35mDelta

Deal found 7/10

$99

Thu 8/218:40 amIAD - STL

Nonstop2h 22mUnited Airlines

Deal found 7/9

$100

Sat 8/305:25 pmIAD - MLI

1 stop6h 23mDelta

Deal found 7/10

$100

Sat 8/96:10 amIAD - STL

1 stop8h 49mFrontier

Deal found 7/8

$103

Mon 8/187:35 amIAD - STL

2 stops12h 00mSouthwest

Deal found 7/9

$108

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 9/11

10:10 pm-11:15 pm

Nonstop2h 05m

Chicago O'Hare Intl

Sun 9/14

8:50 am-11:55 am

Nonstop2h 05m

$143

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 8/21

6:10 am-10:39 am

1 stop5h 29m

Chicago O'Hare Intl

Sat 8/23

6:00 am-4:30 pm

1 stop9h 30m

$154

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 8/21

5:18 pm-11:08 pm

1 stop6h 50m

Chicago Midway

Mon 8/25

6:15 am-4:30 pm

1 stop9h 15m

$154

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Mon 8/18

1:22 pm-6:17 pm

1 stop5h 55m

Chicago Midway

Mon 8/25

9:32 am-3:23 pm

1 stop4h 51m

$180

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 8/23

6:10 am-1:33 pm

1 stop8h 23m

Lambert-St Louis

Sun 8/24

10:17 am-9:27 am

1 stop22h 10m

$190

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 8/23

8:40 am-10:02 am

Nonstop2h 22m

Lambert-St Louis

Mon 8/25

9:17 am-3:52 pm

1 stop5h 35m

$194

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 8/12

6:00 am-9:57 am

1 stop4h 57m

Lambert-St Louis

Fri 8/15

6:00 pm-10:55 pm

1 stop3h 55m

$197

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Tue 8/5

5:23 pm-8:15 pm

1 stop3h 52m

Chicago O'Hare Intl

Wed 8/13

7:15 am-11:32 am

1 stop3h 17m

$197

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Tue 8/5

6:00 am-8:44 am

1 stop3h 44m

Chicago Midway

Wed 8/13

6:04 am-11:44 am

1 stop4h 40m

$197

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 8/21

4:56 pm-4:10 pm

2 stops24h 14m

Chicago O'Hare Intl

Sat 8/23

11:36 am-10:44 am

2 stops22h 08m

$203

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/10

Showing 1-10 of 49 results

...

Best time to book a flight from Dulles Intl to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to Illinois

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Illinois?

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $245). Flying from Washington, D.C. Dulles Intl Airport to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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

When flying from Washington, D.C. Dulles Intl Airport to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to Illinois

The most flights from IAD to USIL are scheduled on a Thursday (30 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (20 on average).

Reviews of airlines servicing Illinois

See what other customers who have flown with Southwest, Delta, and United Airlines from Washington, D.C. Dulles Intl Airport to Illinois have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.0

Very good

4,249 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Southwest

8.0

Very good

4,249 reviews

Southwest

8.0

Very good

4,249 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Delta

8.0

Very good

7,951 reviews

Southwest

8.0

Very good

4,249 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

United Airlines

7.4

Good

8,846 reviews

Southwest

8.0

Very good

4,249 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,249 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Allegiant Air

7.2

Good

704 reviews

Southwest

8.0

Very good

4,249 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Related info for your journey

What are the cheapest airlines to fly from Washington, D.C. Dulles Intl Airport to Illinois one-way?
For one-way options, check prices for Allegiant Air. According to our data, you can fly for as low as $89. Users have also found prices from $91 and $94 on Frontier and United Airlines, respectively.
What are the most popular routes from Washington, D.C. Dulles Intl Airport to Illinois?
The most popular route from Washington, D.C. Dulles Intl Airport to Illinois is Washington, D.C. Dulles Intl - Chicago O'Hare Intl. You may also consider Washington, D.C. Dulles Intl - Chicago Midway or Washington, D.C. Dulles Intl - Lambert-St Louis.
What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to Illinois?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Dulles Intl Airport to Illinois on time: Egyptair (88%), Ethiopian Air (80%), Air China (79%).
What are the cheapest flights from Washington, D.C. Dulles Intl Airport to Illinois?
Looking for the cheapest flight from Washington, D.C. Dulles Intl Airport to Illinois? While on average our users pay $1,584, our data indicates the cheapest price to be $114. The most popular route (Washington, D.C. Dulles Intl - Chicago O'Hare Intl), is priced around $93.
Can I find deals for flights from Dulles Intl to Illinois that include hotel bookings?
Yes. In addition to deals on Dulles Intl to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Illinois.
Can I find deals for business class flights from Dulles Intl to Illinois?
Yes. Cheapflights offers flight deals from Dulles Intl to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Illinois?
Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $245). Flying from Washington, D.C. Dulles Intl Airport to Illinois in March is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Top 4 airlines flying from Dulles Intl to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$87	Average$191	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$161	Average$414	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$176	Average$368	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$304	Average$407	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.

$87+ Cheap flights from Dulles Intl (IAD) to Illinois

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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Illinois with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Dulles Intl to Illinois

Keep the following information in mind while searching for Dulles Intl to Illinois flight deals. Data was last updated July 11, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Dulles Intl to Illinois

Cheapest flights from Dulles Intl to IllinoisExplore the most affordable flight options available from Dulles Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 11, 2025.

Explore the most affordable flight options available from Dulles Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 11, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Illinois that are best for you.

Best time to book a flight from Dulles Intl to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Dulles Intl with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Illinois

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Illinois?

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

Find hourly flight availability from Dulles Intl to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 11, 2025.

Weekly flight availability from Washington, D.C. Dulles Intl Airport to Illinois

Explore weekly flight availability from Dulles Intl to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 11, 2025.

Reviews of airlines servicing Illinois

Related info for your journey

Find useful and relevant information for your journey from Dulles Intl to Illinois. 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 Washington, D.C. Dulles Intl Airport to Illinois one-way?

What are the most popular routes from Washington, D.C. Dulles Intl Airport to Illinois?

What are the most reliable airlines from Washington, D.C. Dulles Intl Airport to Illinois?

What are the cheapest flights from Washington, D.C. Dulles Intl Airport to Illinois?

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

How can I find direct flights from Dulles Intl to Illinois?

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

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Illinois?

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 Dulles Intl to Illinois

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

Top 4 airlines flying from Dulles Intl to Illinois

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Dulles Intl to Illinois
Explore the most affordable flight options available from Dulles Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 11, 2025.