How long is the flight from Illinois to Washington, D.C. Dulles Intl Airport?

Frontier, Delta, and United Airlines can get you from Illinois to Washington, D.C. Dulles Intl Airport in just under 1h 55m. Your travel time can differ by up to 3h 29m. Illinois and Washington, D.C. Dulles Intl Airport are separated by a distance of 587 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $78. Delta flights start at $99 while deals on United Airlines start at $119 one-way.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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

The most popular flight routes from Illinois to Washington, D.C. Dulles Intl Airport are Chicago O'Hare Intl - Washington, D.C. Dulles Intl, Chicago Midway - Washington, D.C. Dulles Intl and Lambert-St Louis - Washington, D.C. Dulles Intl.

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

The cheapest flight price from Illinois to Washington, D.C. Dulles Intl Airport is $142. On average you can expect to pay $1,832. The most popular route, (Chicago O'Hare Intl - Washington, D.C. Dulles Intl), can usually be booked for $143.

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

Before booking your flight from Illinois to Washington, D.C. Dulles Intl Airport check out the most popular airlines for this route: Delta, Frontier or United Airlines.

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

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

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

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

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

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

$66+ Flights from Illinois to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Illinois to Dulles Intl

Round-trip from	$143 (CheapOair)
One-way from	$66 (United Airlines)
Popular in	January
Cheapest in	August
Average price	$212
Good round-trip deal	$326 or less
Good one-way deal	$265 or less

From Illinois to Washington, D.C. Dulles Intl

Search Deals

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

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Highest demand for flights based on searches. 5% potential increase in price ($13 potential increase over avg. RT price).

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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).

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Average for round-trip flights in September 2025

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

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

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Find flight deals from Illinois to Dulles Intl

Cheapest flights from Illinois to Dulles Intl
Explore the most affordable flight options available from Illinois to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

Fri 10/39:48 amMDW - IAD

1 stop7h 31mFrontier

Mon 10/66:10 amIAD - MDW

1 stop11h 15mFrontier

Deal found 9/13

$143

Sat 10/186:00 amORD - IAD

1 stop8h 26mFrontier

Mon 10/204:45 pmIAD - ORD

1 stop7h 54mFrontier

Deal found 9/14

$143

Sat 10/1811:31 amMDW - IAD

1 stop8h 22mFrontier

Mon 10/204:45 pmIAD - MDW

1 stop8h 01mFrontier

Deal found 9/14

$144

Thu 10/239:24 amORD - IAD

1 stop8h 43mFrontier

Mon 10/275:00 pmIAD - ORD

1 stop7h 39mFrontier

Deal found 9/14

$144

Wed 9/249:00 amMDW - IAD

1 stop9h 55mFrontier

Thu 9/251:55 pmIAD - MDW

1 stop10h 25mFrontier

Deal found 9/14

$145

Wed 9/246:44 pmORD - IAD

1 stop13h 33mFrontier

Thu 9/251:55 pmIAD - ORD

1 stop11h 15mFrontier

Deal found 9/14

$145

Thu 10/24:56 pmMDW - IAD

1 stop5h 43mFrontier

Sun 10/57:14 pmIAD - MDW

1 stop13h 09mFrontier

Deal found 9/13

$146

Thu 10/28:05 amORD - IAD

1 stop11h 04mFrontier

Sun 10/57:14 pmIAD - ORD

1 stop25h 30mFrontier

Deal found 9/13

$146

Sun 12/76:00 amMDW - IAD

1 stop5h 49mFrontier

Wed 12/108:00 amIAD - MDW

1 stop14h 32mFrontier

Deal found 9/14

$147

Thu 9/256:20 amMDW - IAD

1 stop5h 35mFrontier

Mon 9/296:10 amIAD - MDW

1 stop10h 50mFrontier

Deal found 9/15

$149

Fri 10/248:44 amORD - IAD

1 stop11h 29mFrontier

Sun 10/268:02 pmIAD - ORD

1 stop12h 08mFrontier

Deal found 9/14

$149

Thu 9/256:20 amMDW - IAD

1 stop5h 35mFrontier

Thu 9/258:59 pmIAD - MDW

1 stop16h 45mFrontier

Deal found 9/14

$150

Best flights from Illinois to Dulles Intl
Discover carefully curated flight deals from Illinois to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 16, 2025.

Fri 10/35:15 pmMDW - IAD

1 stop5h 24mFrontier

Wed 10/89:00 amIAD - MDW

1 stop5h 38mFrontier

Deal found 9/15

$143

Tue 10/146:14 pmSTL - IAD

1 stop3h 46mDelta

Wed 10/156:05 amIAD - STL

1 stop4h 32mDelta

Deal found 9/14

$197

Tue 10/281:00 pmORD - IAD

Nonstop1h 55mUnited Airlines

Tue 11/46:30 amIAD - ORD

Nonstop2h 11mUnited Airlines

Deal found 9/14

$237

Wed 11/55:15 pmPIA - IAD

1 stop4h 52mAmerican Airlines

Wed 11/125:29 pmIAD - PIA

1 stop6h 59mAmerican Airlines

Deal found 9/16

$249

Mon 11/2411:42 amORD - IAD

1 stop23h 00mSun Country Air

Fri 11/2812:26 pmIAD - ORD

1 stop8h 14mSun Country Air

Deal found 9/15

$262

Sat 10/411:21 amMDW - IAD

1 stop6h 08mFrontier

Mon 10/61:55 pmIAD - MDW

1 stop10h 46mFrontier

Deal found 9/14

$143

Fri 10/35:15 pmMDW - IAD

1 stop5h 24mFrontier

Sat 10/47:14 pmIAD - MDW

1 stop15h 04mFrontier

Deal found 9/15

$143

Fri 10/175:28 pmMDW - IAD

1 stop26h 25mFrontier

Mon 10/204:45 pmIAD - MDW

1 stop8h 01mFrontier

Deal found 9/14

$143

Fri 10/311:37 pmMDW - IAD

1 stop8h 52mFrontier

Sun 11/28:36 pmIAD - MDW

1 stop12h 56mFrontier

Deal found 9/14

$143

Thu 11/611:36 amSTL - IAD

1 stop4h 21mDelta

Mon 11/105:59 pmIAD - STL

1 stop6h 41mDelta

Deal found 9/15

$197

Sun 11/161:37 pmMDW - IAD

1 stop9h 34mFrontier

Wed 11/198:40 amIAD - MDW

1 stop5h 01mFrontier

Deal found 9/15

$143

Mon 10/271:30 pmSTL - IAD

1 stop7h 01mDelta

Tue 10/283:33 pmIAD - STL

1 stop7h 31mDelta

Deal found 9/15

$197

Mon 11/36:20 amMDW - IAD

1 stop10h 03mFrontier

Wed 11/58:40 amIAD - MDW

1 stop5h 01mFrontier

Deal found 9/16

$143

Wed 11/129:10 pmORD - IAD

Nonstop1h 49mUnited Airlines

Sat 11/155:15 pmIAD - ORD

Nonstop2h 16mUnited Airlines

Deal found 9/15

$247

Fri 9/266:21 amMDW - IAD

1 stop12h 48mFrontier

Tue 9/309:15 amIAD - MDW

1 stop7h 43mFrontier

Deal found 9/13

$143

Tue 10/216:36 amPIA - IAD

1 stop6h 12mAmerican Airlines

Sat 10/256:34 amIAD - PIA

2 stops10h 06mAmerican Airlines

Deal found 9/14

$254

Thu 10/236:30 amMLI - IAD

1 stop4h 25mUnited Airlines

Sat 10/251:20 pmIAD - MLI

1 stop4h 34mUnited Airlines

Deal found 9/14

$249

Sat 10/256:15 amMDW - IAD

1 stop8h 02mFrontier

Mon 10/275:00 pmIAD - MDW

1 stop7h 46mFrontier

Deal found 9/15

$143

Tue 10/216:20 amMLI - IAD

2 stops11h 34mAmerican Airlines

Sat 10/256:34 amIAD - MLI

2 stops11h 23mAmerican Airlines

Deal found 9/16

$259

Sun 10/56:45 pmMLI - IAD

1 stop4h 01mUnited Airlines

Sun 10/126:30 amIAD - MLI

1 stop4h 45mUnited Airlines

Deal found 9/13

$249

Sat 10/115:00 pmMLI - IAD

1 stop5h 18mDelta

Tue 10/145:52 pmIAD - MLI

1 stop5h 28mDelta

Deal found 9/15

$249

Thu 10/2310:49 amMDW - IAD

1 stop7h 18mFrontier

Mon 10/275:00 pmIAD - MDW

1 stop7h 46mFrontier

Deal found 9/14

$144

Fri 10/246:30 amMLI - IAD

1 stop6h 21mUnited Airlines

Sun 10/266:30 amIAD - MLI

1 stop4h 45mUnited Airlines

Deal found 9/14

$249

Tue 10/215:00 pmMLI - IAD

1 stop5h 18mDelta

Sat 10/255:52 pmIAD - MLI

1 stop5h 28mDelta

Deal found 9/14

$249

Fri 11/215:00 amPIA - IAD

1 stop7h 12mAmerican Airlines

Sun 11/238:09 pmIAD - PIA

1 stop4h 57mAmerican Airlines

Deal found 9/15

$279

Fri 9/266:21 amMDW - IAD

1 stop12h 48mFrontier

Mon 9/291:55 pmIAD - MDW

1 stop10h 25mFrontier

Deal found 9/16

$144

Sat 10/1110:50 amMLI - IAD

1 stop5h 47mUnited Airlines

Sun 10/126:30 amIAD - MLI

1 stop4h 45mUnited Airlines

Deal found 9/15

$249

Wed 10/15:57 amMLI - IAD

1 stop7h 36mDelta

Tue 10/712:27 pmIAD - MLI

1 stop4h 53mDelta

Deal found 9/15

$254

Fri 10/39:48 amMDW - IAD

1 stop7h 31mFrontier

Fri 10/109:38 pmIAD - MDW

1 stop18h 33mFrontier

Deal found 9/14

$152

Fri 10/176:45 pmMLI - IAD

1 stop4h 37mUnited Airlines

Mon 10/205:15 pmIAD - MLI

1 stop4h 50mUnited Airlines

Deal found 9/15

$249

Last-minute flights from Illinois to Dulles Intl
Discover last-minute flight deals from Illinois to Dulles Intl. Data last updated September 16, 2025 and is based on user searches.

Wed 9/249:00 amMDW - IAD

1 stop9h 55mFrontier

Sun 9/287:14 pmIAD - MDW

1 stop13h 09mFrontier

Deal found 9/14

$144

Wed 9/246:44 pmORD - IAD

1 stop13h 33mFrontier

Fri 9/267:14 pmIAD - ORD

1 stop21h 03mFrontier

Deal found 9/14

$144

Wed 9/249:00 amMDW - IAD

1 stop9h 55mFrontier

Thu 9/251:55 pmIAD - MDW

1 stop10h 25mFrontier

Deal found 9/14

$145

Thu 9/256:20 amMDW - IAD

1 stop5h 35mFrontier

Mon 9/296:10 amIAD - MDW

1 stop10h 50mFrontier

Deal found 9/15

$149

Thu 9/256:20 amMDW - IAD

1 stop5h 35mFrontier

Thu 9/258:59 pmIAD - MDW

1 stop16h 45mFrontier

Deal found 9/14

$150

Thu 9/255:10 amORD - IAD

1 stop6h 45mFrontier

Sat 9/277:14 pmIAD - ORD

1 stop25h 30mFrontier

Deal found 9/15

$150

Fri 9/268:49 pmORD - IAD

1 stop20h 35mFrontier

Wed 10/19:15 amIAD - ORD

1 stop9h 24mFrontier

Deal found 9/15

$145

Thu 10/24:56 pmMDW - IAD

1 stop5h 43mFrontier

Sun 10/57:14 pmIAD - MDW

1 stop13h 09mFrontier

Deal found 9/13

$146

Thu 10/28:05 amORD - IAD

1 stop11h 04mFrontier

Sun 10/57:14 pmIAD - ORD

1 stop25h 30mFrontier

Deal found 9/13

$146

Fri 10/35:15 pmMDW - IAD

1 stop5h 24mFrontier

Sun 10/57:14 pmIAD - MDW

1 stop13h 09mFrontier

Deal found 9/14

$143

Sat 10/186:00 amORD - IAD

1 stop8h 26mFrontier

Mon 10/204:45 pmIAD - ORD

1 stop7h 54mFrontier

Deal found 9/14

$143

Fri 10/248:44 amORD - IAD

1 stop11h 29mFrontier

Sun 10/268:02 pmIAD - ORD

1 stop12h 08mFrontier

Deal found 9/14

$149

One-way flights from Illinois to Dulles Intl
Search for one-way flight options from Illinois to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated September 16, 2025.

Tue 11/181:10 pmSTL - IAD

Nonstop2h 07mUnited Airlines

Deal found 9/15

$66

Thu 10/3011:07 amSTL - IAD

1 stop4h 27mFrontier

Deal found 9/14

$72

Sun 10/56:21 amMDW - IAD

1 stop14h 03mFrontier

Deal found 9/15

$78

Sun 10/58:05 amORD - IAD

1 stop12h 19mFrontier

Deal found 9/15

$78

Fri 10/176:05 pmSTL - IAD

1 stop25h 48mFrontier

Deal found 9/13

$78

Sun 9/216:21 amMDW - IAD

1 stop13h 58mFrontier

Deal found 9/14

$79

Sun 9/218:49 pmORD - IAD

1 stop20h 35mFrontier

Deal found 9/14

$79

Sun 10/51:57 pmSTL - IAD

1 stop27h 27mFrontier

Deal found 9/15

$79

Sat 11/158:25 amSTL - IAD

Nonstop2h 08mUnited Airlines

Deal found 9/15

$80

Fri 10/105:28 pmMDW - IAD

1 stop26h 25mFrontier

Deal found 9/14

$82

Fri 10/316:20 amMDW - IAD

1 stop9h 14mFrontier

Deal found 9/15

$83

Fri 10/248:44 amORD - IAD

1 stop11h 29mFrontier

Deal found 9/15

$83

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Fri 10/3

5:15 pm-11:39 pm

1 stop5h 24m

Washington, D.C. Dulles Intl

Wed 10/8

9:00 am-1:38 pm

1 stop5h 38m

$143

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Sat 10/4

11:21 am-6:29 pm

1 stop6h 08m

Washington, D.C. Dulles Intl

Mon 10/6

1:55 pm-11:41 pm

1 stop10h 46m

$143

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Fri 10/3

5:15 pm-11:39 pm

1 stop5h 24m

Washington, D.C. Dulles Intl

Sat 10/4

7:14 pm-9:18 am

1 stop15h 04m

$143

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Fri 10/17

5:28 pm-8:53 pm

1 stop26h 25m

Washington, D.C. Dulles Intl

Mon 10/20

4:45 pm-11:46 pm

1 stop8h 01m

$143

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Fri 10/31

1:37 pm-11:29 pm

1 stop8h 52m

Washington, D.C. Dulles Intl

Sun 11/2

8:36 pm-8:32 am

1 stop12h 56m

$143

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Sun 11/16

1:37 pm-12:11 am

1 stop9h 34m

Washington, D.C. Dulles Intl

Wed 11/19

8:40 am-12:41 pm

1 stop5h 01m

$143

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Mon 11/3

6:20 am-5:23 pm

1 stop10h 03m

Washington, D.C. Dulles Intl

Wed 11/5

8:40 am-12:41 pm

1 stop5h 01m

$143

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Fri 9/26

6:21 am-8:09 pm

1 stop12h 48m

Washington, D.C. Dulles Intl

Tue 9/30

9:15 am-3:58 pm

1 stop7h 43m

$143

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Sat 10/25

6:15 am-3:17 pm

1 stop8h 02m

Washington, D.C. Dulles Intl

Mon 10/27

5:00 pm-11:46 pm

1 stop7h 46m

$143

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Thu 10/23

10:49 am-7:07 pm

1 stop7h 18m

Washington, D.C. Dulles Intl

Mon 10/27

5:00 pm-11:46 pm

1 stop7h 46m

$144

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results

...

Best time to book a flight from Illinois to Dulles Intl

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

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

Currently, August is the cheapest month in which you can book a flight from Illinois to Washington, D.C. Dulles Intl Airport (average of $292). Flying from Illinois to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 IL to IAD?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Washington, D.C. Dulles Intl Airport as you normally would.

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

The most flights from USIL to IAD are scheduled on a Monday (33 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (21 on average).

Related info for your journey

How long is the flight from Illinois to Washington, D.C. Dulles Intl Airport?
Frontier, Delta, and United Airlines can get you from Illinois to Washington, D.C. Dulles Intl Airport in just under 1h 55m. Your travel time can differ by up to 3h 29m. Illinois and Washington, D.C. Dulles Intl Airport are separated by a distance of 587 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines to fly from Illinois to Washington, D.C. Dulles Intl Airport one-way?
To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $78. Delta flights start at $99 while deals on United Airlines start at $119 one-way.
What are the most popular routes from Illinois to Washington, D.C. Dulles Intl Airport?
The most popular flight routes from Illinois to Washington, D.C. Dulles Intl Airport are Chicago O'Hare Intl - Washington, D.C. Dulles Intl, Chicago Midway - Washington, D.C. Dulles Intl and Lambert-St Louis - Washington, D.C. Dulles Intl.
What are the most reliable airlines from Illinois to Washington, D.C. Dulles Intl Airport?
The top 3 most reliable airlines when flying from Illinois to Washington, D.C. Dulles Intl Airport are Egyptair (100%), Air China (82%) and Avianca (80%).
What are the cheapest flights from Illinois to Washington, D.C. Dulles Intl Airport?
The cheapest flight price from Illinois to Washington, D.C. Dulles Intl Airport is $142. On average you can expect to pay $1,832. The most popular route, (Chicago O'Hare Intl - Washington, D.C. Dulles Intl), can usually be booked for $143.
Can I find deals for flights from Illinois to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Illinois to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Illinois to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Dulles Intl.
Can I find deals for business class flights from Illinois to Dulles Intl?
Yes. Cheapflights offers flight deals from Illinois to Dulles Intl 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 Illinois to Washington, D.C. Dulles Intl Airport?
Currently, August is the cheapest month in which you can book a flight from Illinois to Washington, D.C. Dulles Intl Airport (average of $292). Flying from Illinois to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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.

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Woodbridge

Arlington

Alexandria

Tysons

Silver Spring

Springfield

Gaithersburg

Fredericksburg

Linthicum Heights

Fairfax

Falls Church

Owings Mills

Manassas

Rockville

Hanover

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Laurel

Towson

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Dundalk

Browse thousands of different options on Cheapflights for your next trip

Top 4 airlines flying from Illinois to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$95	Average$223	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$176	Average$422	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$189	Average$364	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$258	Average$303	FlexibilityNo cancel fee	On-time71%

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$66+ Cheap flights from Illinois to Dulles Intl (IAD)

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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Illinois to Dulles Intl with Cheapflights

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Cheap flight deals from Illinois to Dulles Intl

Keep the following information in mind while searching for Illinois to Dulles Intl flight deals. Data was last updated September 16, 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 Illinois to Dulles Intl

Cheapest flights from Illinois to Dulles IntlExplore the most affordable flight options available from Illinois to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

Explore the most affordable flight options available from Illinois to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Illinois to Dulles Intl

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

Cheapflights Insights

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

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

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

Find hourly flight availability from Illinois to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 16, 2025.

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

Related info for your journey

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

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

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

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

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

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

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

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

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

Traveling to a place near Washington, D.C. Dulles Intl Airport?

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Alternative routes for Illinois to Dulles Intl

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Top 4 airlines flying from Illinois to Dulles Intl

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Cheapest flights from Illinois to Dulles Intl
Explore the most affordable flight options available from Illinois to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 16, 2025.