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Dulles Intl

$93+ 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 9/16. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — IAD
Jul 10 — Jul 171
Fri 7/10
Fri 7/17
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 June 10, 2026.

This Kiwi.com deal was found by Cheapflights users on 6/10. 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.
Mon 8/3111:43 am
BMI
-
IAD
2 stops27h 37m
Multiple Airlines
Wed 9/98:00 pm
IAD
-
BMI
1 stop20h 34m
Multiple Airlines
Deal found 6/10$225
This Frontier deal was found by Cheapflights users on 6/7. 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 10/17:25 am
MDW
-
IAD
1 stop9h 11m
Frontier
Sun 10/47:00 am
IAD
-
MDW
1 stop4h 58m
Frontier
Deal found 6/7$245
This Expedia deal was found by Cheapflights users on 6/7. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/31:29 pm
ORD
-
IAD
1 stop8h 53m
Frontier
Fri 7/108:33 pm
IAD
-
ORD
1 stop12h 20m
Frontier
Deal found 6/7$245
This United Airlines deal was found by Cheapflights users on 6/6. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/3011:07 am
ORD
-
IAD
Nonstop2h 05m
United Airlines
Wed 7/88:15 am
IAD
-
ORD
Nonstop2h 21m
United Airlines
Deal found 6/6$247
This Trip.com deal was found by Cheapflights users on 6/8. 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.
Fri 7/171:50 pm
ORD
-
IAD
1 stop8h 05m
Frontier
Tue 7/218:33 pm
IAD
-
ORD
1 stop12h 20m
Frontier
Deal found 6/8$248
This Delta deal was found by Cheapflights users on 6/8. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1710:48 am
MDW
-
IAD
1 stop4h 47m
Delta
Mon 9/2112:31 pm
IAD
-
MDW
1 stop4h 40m
Delta
Deal found 6/8$249
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 7/111:50 pm
ORD
-
IAD
1 stop8h 05m
Frontier
Mon 7/138:33 pm
IAD
-
ORD
1 stop12h 20m
Frontier
Deal found 6/10$249
This Orbitz deal was found by Cheapflights users on 6/9. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:00 am
MDW
-
IAD
1 stop9h 20m
Frontier
Sun 9/611:11 am
IAD
-
MDW
1 stop12h 00m
Frontier
Deal found 6/9$250
This Expedia deal was found by Cheapflights users on 6/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/91:50 pm
ORD
-
IAD
1 stop8h 05m
Frontier
Sat 7/118:33 pm
IAD
-
ORD
1 stop12h 20m
Frontier
Deal found 6/10$250
This Kiwi.com deal was found by Cheapflights users on 6/10. 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 7/166:05 am
MDW
-
IAD
1 stop9h 35m
Frontier
Wed 7/227:49 am
IAD
-
MDW
1 stop15h 14m
Frontier
Deal found 6/10$251
This Frontier deal was found by Cheapflights users on 6/10. 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 7/231:50 pm
ORD
-
IAD
1 stop8h 05m
Frontier
Fri 7/248:33 pm
IAD
-
ORD
1 stop12h 20m
Frontier
Deal found 6/10$251
This Frontier deal was found by Cheapflights users on 6/9. 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.
Mon 7/207:05 am
ORD
-
IAD
1 stop9h 09m
Frontier
Sat 7/258:33 pm
IAD
-
ORD
1 stop12h 20m
Frontier
Deal found 6/9$252

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 June 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$241
(Delta)

One-way from

$93
(Kiwi.com)

Popular in

March

Cheapest in

August

Average price

$329

Good round-trip deal

$471 or less

Good one-way deal

$202 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. 15% potential increase in price ($48 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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.
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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 June 10, 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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Mon 8/17

6:42 pm-11:26 pm

1 stop3h 44m

Washington, D.C. Dulles Intl

Wed 8/19

8:28 am-11:51 am

1 stop4h 23m

$251

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Sat 7/11

6:35 pm-11:13 pm

1 stop3h 38m

Washington, D.C. Dulles Intl

Mon 7/13

6:00 am-9:13 am

1 stop4h 13m

$267

MolineWashington, D.C.

MLI - IAD

MLIIAD

Moline Quad-City

Fri 7/3

11:43 am-12:10 am

2 stops11h 27m

Washington, D.C. Dulles Intl

Sat 7/11

5:03 am-10:58 am

2 stops6h 55m

$271

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Fri 7/24

6:00 am-2:01 pm

1 stop7h 01m

Washington, D.C. Dulles Intl

Tue 7/28

10:21 am-4:15 pm

1 stop6h 54m

$273

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Tue 7/21

9:40 pm-12:45 am

Nonstop2h 05m

Washington, D.C. Dulles Intl

Wed 7/22

1:15 pm-2:29 pm

Nonstop2h 14m

$277

ChampaignWashington, D.C.

CMI - IAD

CMIIAD

Champaign University-Willard

Tue 9/15

1:23 pm-10:51 pm

2 stops8h 28m

Washington, D.C. Dulles Intl

Sat 9/19

7:57 am-6:10 pm

2 stops11h 13m

$281

MolineWashington, D.C.

MLI - IAD

MLIIAD

Moline Quad-City

Wed 9/9

6:32 am-11:52 am

1 stop4h 20m

Washington, D.C. Dulles Intl

Sun 9/13

8:20 am-12:31 pm

1 stop5h 11m

$285

MolineWashington, D.C.

MLI - IAD

MLIIAD

Moline Quad-City

Fri 7/3

11:08 am-7:35 pm

1 stop7h 27m

Washington, D.C. Dulles Intl

Sat 7/11

6:00 am-10:12 am

1 stop5h 12m

$286

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Thu 8/6

8:40 am-11:52 am

Nonstop2h 12m

Washington, D.C. Dulles Intl

Sun 8/9

6:10 am-7:27 am

Nonstop2h 17m

$289

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Thu 7/9

9:40 pm-12:45 am

Nonstop2h 05m

Washington, D.C. Dulles Intl

Sat 7/11

10:20 pm-11:31 pm

Nonstop2h 11m

$297

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $80). Flying from Illinois to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $161). 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 June 10, 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 39% on the cost of your flight, compared to a flight at noon.

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 June 10, 2026.

The most flights from USIL to IAD are scheduled on a Wednesday (32 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (20 on average).

How much does it cost to fly round-trip from Illinois to Washington, D.C. Dulles Intl Airport?

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

The price you pay for your flight from Illinois to Washington, D.C. Dulles Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 48 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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 June 8, 2026.

Travelers seeking maximum savings on their Illinois to Washington, D.C. Dulles Intl Airport flight should consider departing on Thursday evenings 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.

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?

    Delta, American Airlines, and United Airlines can get you from Illinois to Washington, D.C. Dulles Intl Airport in just under 2h 05m. Your travel time can differ by up to 9h 22m. 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 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 Sun Country Air (100%), Egyptair (100%) and Avianca (90%).

  • 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 $138. On average you can expect to pay $672. The most popular route, (Chicago O'Hare Intl - Washington, D.C. Dulles Intl), can usually be booked for $181.

  • 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 $80). Flying from Illinois to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $161). 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
Tysons
Owings Mills
Springfield
Arlington
Reston
Rockville
Herndon
Fredericksburg
Laurel
Hyattsville
Manassas
Hanover
Chantilly
Lanham
Falls Church
Waldorf
Silver Spring
Largo
Clinton

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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.
Dallas/Fort Worth to Dulles Intl flights
Dallas/Fort Worth to Baltimore flights
Hobby to Baltimore flights
Dallas/Fort Worth to Reagan-National flights
Los Angeles to Reagan-National flights
Atlanta to Dulles Intl flights
Los Angeles to Dulles Intl flights
Los Angeles to Baltimore flights
Hobby to Reagan-National flights
Boston to Baltimore flights
Seattle to Dulles Intl flights
Atlanta to Baltimore flights
O'Hare Intl to Baltimore flights
San Francisco to Dulles Intl flights
Denver to Dulles Intl flights
O'Hare Intl to Reagan-National flights
Atlanta to Reagan-National flights
George Bush Intcntl to Baltimore flights
San Francisco to Reagan-National flights
Boston to Reagan-National flights
Boston to Dulles Intl flights
Seattle to Reagan-National flights
O'Hare Intl to Dulles Intl flights
San Francisco to Baltimore flights
Hobby to Dulles Intl flights
Seattle to Baltimore flights
George Bush Intcntl to Reagan-National flights
Denver to Baltimore flights
George Bush Intcntl to Dulles Intl flights
Tampa to Dulles Intl flights
Tampa to Baltimore flights
Fort Lauderdale to Dulles Intl flights
Orlando to Baltimore flights
Orlando to Dulles Intl flights
Ontario to Dulles Intl flights
Sky Harbor Intl to Dulles Intl flights
Minneapolis to Dulles Intl flights
Austin to Dulles Intl flights
Midway to Baltimore flights
Miami to Baltimore flights
Miami to Dulles Intl flights
San Diego to Dulles Intl flights
Orlando to Reagan-National flights
Denver to Reagan-National flights
Newark to Reagan-National flights
Austin to Reagan-National flights
Minneapolis to Reagan-National flights
Miami to Reagan-National flights
Detroit to Reagan-National flights
Newark to Dulles Intl flights

Top 2 airlines flying from Illinois to Dulles Intl

Discover the top 2 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 June 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$100Average$208FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$214Average$337FlexibilityNo cancel feeOn-time69%

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