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Dulles Intl

$54+ 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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — IAD
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap 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 January 29, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/55:05 am
ORD
-
IAD
1 stop10h 38m
Frontier
Mon 3/96:20 am
IAD
-
ORD
1 stop27h 03m
Frontier
Deal found 1/28$137
This Frontier deal was found by Cheapflights users on 1/27. 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 2/199:05 am
MDW
-
IAD
1 stop6h 38m
Frontier
Sat 2/2810:29 am
IAD
-
MDW
1 stop12h 10m
Frontier
Deal found 1/27$138
This Kiwi.com deal was found by Cheapflights users on 1/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/264:42 pm
ORD
-
IAD
1 stop17h 01m
Frontier
Mon 3/25:22 pm
IAD
-
ORD
1 stop18h 29m
Frontier
Deal found 1/29$141
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/74:44 pm
ORD
-
IAD
1 stop6h 47m
Frontier
Mon 3/98:09 am
IAD
-
ORD
1 stop8h 19m
Frontier
Deal found 1/27$146
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/46:02 pm
ORD
-
IAD
1 stop15h 31m
Multiple Airlines
Mon 3/92:58 pm
IAD
-
ORD
2 stops27h 48m
Multiple Airlines
Deal found 1/27$147
This Frontier deal was found by Cheapflights users on 1/29. 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 2/199:05 am
MDW
-
IAD
1 stop6h 38m
Frontier
Mon 2/2311:41 am
IAD
-
MDW
1 stop9h 06m
Frontier
Deal found 1/29$148
This Frontier deal was found by Cheapflights users on 1/29. 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 2/195:05 am
ORD
-
IAD
1 stop10h 38m
Frontier
Mon 2/235:22 pm
IAD
-
ORD
1 stop6h 17m
Frontier
Deal found 1/29$148
This Trip.com deal was found by Cheapflights users on 1/27. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/199:05 am
MDW
-
IAD
1 stop6h 38m
Frontier
Thu 2/2611:22 am
IAD
-
MDW
1 stop5h 54m
Frontier
Deal found 1/27$150
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/267:23 pm
ORD
-
IAD
1 stop21h 44m
Multiple Airlines
Thu 3/511:22 am
IAD
-
ORD
1 stop12h 17m
Multiple Airlines
Deal found 1/27$151
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/266:25 am
MDW
-
IAD
1 stop9h 18m
Frontier
Thu 3/511:22 am
IAD
-
MDW
1 stop5h 54m
Frontier
Deal found 1/27$153
This Kiwi.com deal was found by Cheapflights users on 1/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/206:48 pm
MDW
-
IAD
1 stop13h 46m
Frontier
Mon 2/235:22 pm
IAD
-
MDW
1 stop6h 07m
Frontier
Deal found 1/29$156
This Kiwi.com deal was found by Cheapflights users on 1/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/186:02 pm
ORD
-
IAD
1 stop15h 31m
Frontier
Thu 2/2611:22 am
IAD
-
ORD
1 stop12h 17m
Frontier
Deal found 1/29$156

Find 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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$137
(Kiwi.com)

One-way from

$54
(Trip.com)

Popular in

November

Cheapest in

August

Average price

$288

Good round-trip deal

$513 or less

Good one-way deal

$234 or less
Provider with most accurate pricing for Chicago (CHI)-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-Washington, D.C. (WAS) flights.
Search Deals
From Illinois to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Illinois to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals
Price to beat on a round-trip flight from Illinois to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Illinois to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Dulles Intl 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 January 29, 2026.
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

Illinois

Fly to

Dulles Intl

Route

Depart

Return

Price

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Thu 2/19

9:05 am-4:43 pm

1 stop6h 38m

Washington, D.C. Dulles Intl

Sat 2/28

10:29 am-9:39 pm

1 stop12h 10m

$138

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Thu 2/19

9:05 am-4:43 pm

1 stop6h 38m

Washington, D.C. Dulles Intl

Mon 2/23

11:41 am-7:47 pm

1 stop9h 06m

$148

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Thu 2/26

6:25 am-4:43 pm

1 stop9h 18m

Washington, D.C. Dulles Intl

Thu 3/5

11:22 am-4:16 pm

1 stop5h 54m

$153

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Thu 3/12

2:41 pm-12:31 am

1 stop8h 50m

Washington, D.C. Dulles Intl

Sun 3/15

6:20 am-7:47 pm

1 stop14h 27m

$183

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Sat 3/7

6:15 am-6:24 am

1 stop23h 09m

Washington, D.C. Dulles Intl

Mon 3/9

8:09 am-8:53 pm

1 stop13h 44m

$217

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Wed 3/11

5:45 pm-8:37 pm

Nonstop1h 52m

Washington, D.C. Dulles Intl

Thu 3/12

6:15 am-7:28 am

Nonstop2h 13m

$221

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Mon 3/9

5:45 pm-8:37 pm

Nonstop1h 52m

Washington, D.C. Dulles Intl

Tue 3/10

1:15 pm-2:34 pm

Nonstop2h 19m

$221

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Mon 2/9

6:20 am-4:28 pm

1 stop9h 08m

Washington, D.C. Dulles Intl

Thu 2/19

5:37 pm-10:37 pm

1 stop6h 00m

$222

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Fri 2/13

6:00 am-5:13 pm

1 stop10h 13m

Washington, D.C. Dulles Intl

Mon 2/16

5:22 pm-7:07 pm

1 stop26h 45m

$225

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Thu 2/19

9:05 am-4:43 pm

1 stop6h 38m

Washington, D.C. Dulles Intl

Sun 2/22

5:39 pm-10:25 pm

1 stop5h 46m

$229

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/29

Showing 1-10 of 60 results
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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, October is the cheapest month in which you can book a flight from Illinois to Washington, D.C. Dulles Intl Airport (average of $142). Flying from Illinois to Washington, D.C. Dulles Intl Airport in November is currently the most expensive (average of $253). 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?

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 January 29, 2026.

It’s optimal to fly from Illinois to Washington, D.C. Dulles Intl Airport in the morning. By choosing this option you can save up to 53% on the cost of your flight, compared to a flight at noon.

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

Use this chart to determine the cheapest time to fly round-trip from Illinois to Dulles Intl. Price data was last updated on January 24, 2026.

Travelers seeking maximum savings on their Illinois to Washington, D.C. Dulles Intl Airport flight should consider departing on Saturday mornings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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

Explore weekly flight availability from Illinois to Dulles Intl. 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 January 29, 2026.

The most flights from USIL to IAD are scheduled on a Monday (19 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (14 on average).

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?

    Frontier, United Airlines, and Delta can get you from Illinois to Washington, D.C. Dulles Intl Airport in just under 1h 52m. Your travel time can differ by up to 4h 46m. 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 $65. Delta flights start at $99 while deals on United Airlines start at $108 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 (94%) and Avianca (84%).

  • 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 $115. On average you can expect to pay $1,230. The most popular route, (Chicago O'Hare Intl - Washington, D.C. Dulles Intl), can usually be booked for $154.

  • 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, October is the cheapest month in which you can book a flight from Illinois to Washington, D.C. Dulles Intl Airport (average of $142). Flying from Illinois to Washington, D.C. Dulles Intl Airport in November is currently the most expensive (average of $253). 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

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

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Silver Spring
Herndon
Fredericksburg
Hanover
Linthicum Heights
Rockville
Laurel
Towson
Manassas
Largo
Bowie
McLean
Clinton
Upper Marlboro

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Alternative routes for Illinois to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Reagan-National flights
Dallas/Fort Worth to Dulles Intl flights
Los Angeles to Baltimore flights
Los Angeles to Dulles Intl flights
O'Hare Intl to Reagan-National flights
Boston to Baltimore flights
Dallas/Fort Worth to Baltimore flights
O'Hare Intl to Baltimore flights
Dallas/Fort Worth to Reagan-National flights
O'Hare Intl to Dulles Intl flights
San Francisco to Reagan-National flights
Boston to Dulles Intl flights
Boston to Reagan-National flights
Orlando to Dulles Intl flights
Atlanta to Baltimore flights
Seattle to Reagan-National flights
Miami to Dulles Intl flights
Atlanta to Dulles Intl flights
Hobby to Reagan-National flights
Hobby to Dulles Intl flights
San Francisco to Dulles Intl flights
Atlanta to Reagan-National flights
George Bush Intcntl to Reagan-National flights
San Francisco to Baltimore flights
Orlando to Reagan-National flights
Seattle to Dulles Intl flights
Fort Lauderdale to Dulles Intl flights
Denver to Baltimore flights
Detroit to Dulles Intl flights
Hobby to Baltimore flights
Orlando to Baltimore flights
Miami to Baltimore flights
Charlotte to Dulles Intl flights
Tampa to Dulles Intl flights
Austin to Dulles Intl flights
George Bush Intcntl to Dulles Intl flights
Denver to Dulles Intl flights
Seattle to Baltimore flights
Midway to Dulles Intl flights
Denver to Reagan-National flights
Fort Lauderdale to Baltimore flights
Minneapolis to Reagan-National flights
Detroit to Baltimore flights
Sky Harbor Intl to Dulles Intl flights
Austin to Reagan-National flights
Charlotte to Baltimore flights
LaGuardia to Reagan-National flights
Austin to Baltimore flights
Tampa to Reagan-National flights
Minneapolis to Baltimore flights

Top 3 airlines flying from Illinois to Dulles Intl

Discover the top 3 airlines that operate flights from Illinois to Dulles Intl. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$103Average$265FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$197Average$370FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$258Average$445FlexibilityNo cancel feeOn-time71%

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