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Dulles Intl

$67+ 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 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — IAD
Sep 5 — Sep 121
Sat 9/5
Sat 9/12
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 August 6, 2026.

This Booking.com deal was found by Cheapflights users on 8/5. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/31:59 pm -
1 stop7h 53m
Mon 9/79:44 pm -
1 stop26h 24m
Deal found 8/5$182
This Jettzy deal was found by Cheapflights users on 8/5. 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 Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/21:59 pm -
1 stop7h 53m
Tue 9/86:09 pm -
1 stop22h 11m
Deal found 8/5$183
This Trip.com deal was found by Cheapflights users on 8/5. 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.
Mon 9/1410:26 am -
1 stop5h 52m
Mon 9/2112:30 pm -
1 stop8h 05m
Deal found 8/5$184
This Trip.com deal was found by Cheapflights users on 8/2. 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.
Wed 9/21:59 pm -
1 stop7h 53m
Sat 9/54:52 pm -
1 stop7h 16m
Deal found 8/2$185
This CheapOair deal was found by Cheapflights users on 8/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2711:50 am -
1 stop10h 02m
Mon 8/316:20 am -
1 stop5h 35m
Deal found 8/1$186
This CheapOair deal was found by Cheapflights users on 8/2. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/271:59 pm -
1 stop7h 53m
Mon 8/318:39 pm -
1 stop12h 14m
Deal found 8/2$186
This Trip.com deal was found by Cheapflights users on 8/3. 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.
Sat 9/51:59 pm -
1 stop7h 53m
Mon 9/79:44 pm -
1 stop26h 24m
Deal found 8/3$187
This Expedia deal was found by Cheapflights users on 8/6. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/277:25 am -
1 stop9h 11m
Sat 10/317:00 am -
1 stop4h 58m
Deal found 8/6$188
This Trip.com deal was found by Cheapflights users on 8/1. 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 10/229:20 am -
1 stop7h 16m
Mon 10/268:00 pm -
1 stop28h 50m
Deal found 8/1$188
This CheapOair deal was found by Cheapflights users on 8/1. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/219:20 am -
1 stop7h 16m
Sat 10/249:16 pm -
1 stop11h 59m
Deal found 8/1$189
This Kissandfly.com deal was found by Cheapflights users on 8/3. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/36:05 am -
1 stop10h 09m
Sun 9/66:00 am -
1 stop5h 10m
Deal found 8/3$191
This Trip.com deal was found by Cheapflights users on 8/1. 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.
Tue 9/156:00 am -
1 stop8h 34m
Tue 9/227:50 am -
1 stop11h 33m
Deal found 8/1$191

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 August 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$182
(Booking.com)

One-way from

$67
(Trip.com)

Popular in

June

Cheapest in

September

Average price

$239

Good round-trip deal

$429 or less

Good one-way deal

$235 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.
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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. 19% potential increase in price ($67 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($9 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 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 August 6, 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.

ORD Chicago O'Hare Intl - IAD Washington, D.C. Dulles Intl

ORDIAD

Chicago O'Hare Intl

Sat 9/5

1:50 pm-8:05 pm

1 stop5h 15m

Washington, D.C. Dulles Intl

Sun 9/6

6:10 am-10:42 am

1 stop5h 32m

$199

ChicagoWashington, D.C.

ORD Chicago O'Hare Intl - IAD Washington, D.C. Dulles Intl

ORDIAD

Chicago O'Hare Intl

Tue 9/1

6:15 pm-9:20 pm

Nonstop2h 05m

Washington, D.C. Dulles Intl

Sat 9/5

5:15 pm-6:37 pm

Nonstop2h 22m

$216

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Thu 9/3

6:42 pm-11:26 pm

1 stop3h 44m

Washington, D.C. Dulles Intl

Sun 9/6

6:10 am-9:17 am

1 stop4h 07m

$236
Quickest round-trip

ChicagoWashington, D.C.

ORD Chicago O'Hare Intl - IAD Washington, D.C. Dulles Intl

ORDIAD

Chicago O'Hare Intl

Tue 10/27

9:41 pm-12:30 am

Nonstop1h 49m

Washington, D.C. Dulles Intl

Sat 10/31

8:23 am-9:45 am

Nonstop2h 22m

$255

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Fri 9/4

5:10 pm-12:34 am

1 stop6h 24m

Washington, D.C. Dulles Intl

Sun 9/6

6:10 am-9:17 am

1 stop4h 07m

$265

ChicagoWashington, D.C.

ORD Chicago O'Hare Intl - IAD Washington, D.C. Dulles Intl

ORDIAD

Chicago O'Hare Intl

Fri 9/4

11:22 am-4:38 pm

1 stop4h 16m

Washington, D.C. Dulles Intl

Sun 9/6

6:00 am-12:40 pm

1 stop7h 40m

$265

MolineWashington, D.C.

MLI Moline Quad-City - IAD Washington, D.C. Dulles Intl

MLIIAD

Moline Quad-City

Wed 9/23

11:19 am-5:11 pm

1 stop4h 52m

Washington, D.C. Dulles Intl

Tue 9/29

12:26 pm-4:22 pm

1 stop4h 56m

$271

MolineWashington, D.C.

MLI Moline Quad-City - IAD Washington, D.C. Dulles Intl

MLIIAD

Moline Quad-City

Tue 10/13

5:04 pm-12:42 am

1 stop6h 38m

Washington, D.C. Dulles Intl

Tue 10/20

10:14 am-4:22 pm

1 stop7h 08m

$271

MolineWashington, D.C.

MLI Moline Quad-City - IAD Washington, D.C. Dulles Intl

MLIIAD

Moline Quad-City

Wed 9/30

6:00 am-2:11 pm

1 stop7h 11m

Washington, D.C. Dulles Intl

Sat 10/3

6:07 pm-10:30 pm

1 stop5h 23m

$271

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Tue 10/13

6:44 pm-11:16 pm

1 stop3h 32m

Washington, D.C. Dulles Intl

Wed 10/14

6:00 am-10:03 am

1 stop5h 03m

$275

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/1

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, September is the cheapest month in which you can book a flight from Illinois to Washington, D.C. Dulles Intl Airport (average of $298). Flying from Illinois to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $403). 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 August 6, 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.

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

Airfare is below average for this route at the moment.
Illinois to Washington, D.C. Dulles Intl Airport flights typically cost between $251 and $537 in September.
The cheapest round-trip price found within the last 5 days was $182 on Frontier (Sep 3-Sep 7).

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 41 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 August 1, 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. Monday evenings 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, United Airlines, and American 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 4h 48m. 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 Egyptair (96%), ITA Airways (94%) and Air China (94%).

  • 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 $128. On average you can expect to pay $1,906. The most popular route, (Chicago O'Hare Intl - Washington, D.C. Dulles Intl), can usually be booked for $187.

  • 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, September is the cheapest month in which you can book a flight from Illinois to Washington, D.C. Dulles Intl Airport (average of $298). Flying from Illinois to Washington, D.C. Dulles Intl Airport in March is currently the most expensive (average of $403). 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
Owings Mills
Arlington
Tysons
Springfield
Lanham
Reston
Herndon
Rockville
Chantilly
Hyattsville
Fredericksburg
Falls Church
Hanover
Laurel
Sterling
Clinton
Oxon Hill
Hunt Valley
Woodbridge

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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
Dallas/Fort Worth to Reagan-National flights
Atlanta to Dulles Intl flights
Los Angeles to Reagan-National flights
Boston to Baltimore flights
Atlanta to Reagan-National flights
Seattle to Reagan-National flights
O'Hare Intl to Reagan-National flights
Los Angeles to Baltimore flights
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Atlanta to Baltimore flights
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San Francisco to Reagan-National flights
Fort Lauderdale to Baltimore flights
O'Hare Intl to Baltimore flights
Tampa to Dulles Intl flights
Boston to Reagan-National flights
Hobby to Reagan-National flights
San Francisco to Baltimore flights
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Minneapolis to Dulles Intl flights
Los Angeles to Dulles Intl flights
Orlando to Dulles Intl flights
Tampa to Reagan-National flights
Denver to Baltimore flights
Orlando to Baltimore flights
Tampa to Baltimore flights
Orlando to Reagan-National flights
John F Kennedy Intl to Dulles Intl flights
Denver to Dulles Intl flights
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Miami to Reagan-National flights
Minneapolis to Reagan-National flights
Boston to Dulles Intl flights
George Bush Intcntl to Dulles Intl flights
George Bush Intcntl to Reagan-National flights
Seattle to Baltimore flights
Minneapolis to Baltimore flights
Austin to Dulles Intl flights
Fort Lauderdale to Dulles Intl flights
Detroit to Baltimore flights
Miami to Dulles Intl flights
Charlotte to Dulles Intl flights
Charlotte to Baltimore flights
Ontario to Dulles Intl flights
Midway to Dulles Intl flights
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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 August 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$99Average$195FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$230Average$360FlexibilityNo cancel feeOn-time69%
DeltaCheapest$296Average$407FlexibilityNo cancel feeOn-timeN/A

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