HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$55+ 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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ORD
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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.

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 October 30, 2025.

This Frontier deal was found by Cheapflights users on 10/30. 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.
Fri 12/55:45 amIAD - ORD
1 stop9h 55mFrontier
Sun 12/76:11 amORD - IAD
1 stop9h 13mFrontier
Deal found 10/30$141
This Frontier deal was found by Cheapflights users on 10/30. 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.
Fri 12/55:19 pmIAD - MDW
1 stop5h 53mFrontier
Sun 12/76:15 amMDW - IAD
1 stop9h 09mFrontier
Deal found 10/30$141
This Booking.com deal was found by Cheapflights users on 10/30. 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.
Fri 12/125:19 pmIAD - MDW
1 stop5h 53mFrontier
Sun 12/142:59 pmMDW - IAD
1 stop23h 06mFrontier
Deal found 10/30$142
This CheapOair deal was found by Cheapflights users on 10/27. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/146:00 amIAD - ORD
1 stop11h 56mFrontier
Mon 11/175:05 amORD - IAD
1 stop10h 53mFrontier
Deal found 10/27$143
This Priceline deal was found by Cheapflights users on 10/29. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/145:34 pmIAD - MDW
1 stop5h 34mFrontier
Sat 11/151:37 pmMDW - IAD
1 stop9h 18mFrontier
Deal found 10/29$143
This Booking.com deal was found by Cheapflights users on 10/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/55:19 pmIAD - MDW
1 stop5h 53mFrontier
Sat 12/62:59 pmMDW - IAD
1 stop19h 10mFrontier
Deal found 10/29$145
This Booking.com deal was found by Cheapflights users on 10/29. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/125:19 pmIAD - ORD
1 stop6h 05mFrontier
Sun 12/148:45 amORD - IAD
1 stop22h 46mFrontier
Deal found 10/29$146
This Kiwi.com deal was found by Cheapflights users on 10/30. 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 11/246:46 pmIAD - ORD
1 stop6h 22mFrontier
Thu 11/276:00 amORD - IAD
1 stop10h 46mFrontier
Deal found 10/30$147
This Frontier deal was found by Cheapflights users on 10/30. 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 11/106:00 amIAD - ORD
1 stop5h 41mFrontier
Tue 11/1812:37 pmORD - IAD
1 stop6h 43mFrontier
Deal found 10/30$150
This Frontier deal was found by Cheapflights users on 10/30. 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 11/105:44 pmIAD - MDW
1 stop5h 27mFrontier
Tue 11/181:56 pmMDW - IAD
1 stop5h 24mFrontier
Deal found 10/30$150
This Mytrip deal was found by Cheapflights users on 10/30. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/88:36 pmIAD - MDW
1 stop13h 36mFrontier
Thu 12/42:16 pmMDW - IAD
1 stop23h 49mFrontier
Deal found 10/30$151
This Kiwi.com deal was found by Cheapflights users on 10/29. 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.
Sun 12/75:26 pmIAD - ORD
1 stop5h 58mFrontier
Tue 12/94:22 pmORD - IAD
1 stop21h 07mFrontier
Deal found 10/29$155

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 October 30, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$141
(Kiwi.com)

One-way from

$55
(Frontier)

Popular in

April

Cheapest in

September

Average price

$252

Good round-trip deal

$291 or less

Good one-way deal

$201 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Chicago (CHI) flights.
Search Deals
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. 7% potential increase in price ($21 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Illinois 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 October 30, 2025.
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

Dulles Intl

Fly to

Illinois

Route

Depart

Return

Price

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Wed 11/12

8:40 am-12:41 pm

1 stop5h 01m

Chicago Midway

Fri 11/14

1:37 pm-12:11 am

1 stop9h 34m

$167

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 11/13

6:00 am-2:33 pm

2 stops9h 33m

Chicago Midway

Mon 11/17

9:27 am-7:52 pm

1 stop9h 25m

$195

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 11/20

6:55 am-2:29 pm

1 stop8h 34m

Lambert-St Louis

Sun 11/23

3:14 pm-11:59 pm

1 stop7h 45m

$230

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 11/20

6:55 am-2:29 pm

1 stop8h 34m

Lambert-St Louis

Sun 11/23

11:08 am-11:59 pm

2 stops35h 51m

$237

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Wed 12/17

5:15 pm-6:31 pm

Nonstop2h 16m

Chicago O'Hare Intl

Tue 1/6

8:52 am-11:46 am

Nonstop1h 54m

$237

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Fri 11/28

6:30 am-11:50 am

1 stop6h 20m

Moline Quad-City

Fri 12/5

10:50 am-5:30 pm

1 stop5h 40m

$249

Washington, D.C.Peoria

IAD - PIA

IADPIA

Washington, D.C. Dulles Intl

Sat 1/24

5:17 pm-9:39 pm

1 stop5h 22m

Greater Peoria

Mon 1/26

1:24 pm-9:17 pm

1 stop6h 53m

$249

Washington, D.C.Peoria

IAD - PIA

IADPIA

Washington, D.C. Dulles Intl

Sat 2/21

8:15 am-12:43 pm

1 stop5h 28m

Greater Peoria

Mon 2/23

1:25 pm-9:23 pm

1 stop6h 58m

$249

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Wed 12/10

12:30 pm-4:48 pm

1 stop5h 18m

Chicago O'Hare Intl

Tue 12/16

11:15 am-5:00 pm

1 stop4h 45m

$257

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Tue 12/9

5:59 pm-10:43 pm

1 stop5h 44m

Chicago O'Hare Intl

Tue 12/16

11:15 am-6:21 pm

1 stop6h 06m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

Showing 1-10 of 60 results
1
2
3
...
6

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, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $122). Flying from Washington, D.C. Dulles Intl Airport to Illinois in January is currently the most expensive (average of $208). 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?

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 October 30, 2025.

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Illinois in the evening. Doing so could potentially save you 42% on the flight price compared to flying in the morning, which is usually more expensive.

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

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Illinois. Price data was last updated on December 16, 2024.

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

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

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated October 30, 2025.
See what other customers who have flown with Delta, United Airlines, and Frontier 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.
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Crew

8.5

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Delta
7.9
Good
7,996 reviews
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Crew

8.5

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
United Airlines
7.4
Good
8,998 reviews
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Crew

8.5

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.
Frontier
5.8
Fair
3,123 reviews
Delta
7.9
Good
7,996 reviews

Comfort

7.9

Entertainment

7.9

Food

7.3

Overall

7.9

Crew

8.5

Boarding

8.2

Reviews

1 / 20
8.0
Excellent

Matthew,Oct 2025

GSP - ATL

This is always a full flight since it is the connecting route to primary destinations through Atlanta. That said, the crew handles the full load well. Not much more to say, it is a short flight with no in-flight services due to the length.

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.

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

    For as low as $237, Frontier can have you in Illinois from Washington, D.C. Dulles Intl Airport in 2h 16m. Washington, D.C. Dulles Intl Airport and Illinois are separated by a distance of 587 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 Frontier. According to our data, you can fly for as low as $87. Users have also found prices from $110 and $120 on United Airlines and Delta, 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: Air China (97%), Egyptair (96%), Ethiopian Air (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 $1,032, our data indicates the cheapest price to be $128. The most popular route (Washington, D.C. Dulles Intl - Chicago O'Hare Intl), is priced around $110.

  • 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, February is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $122). Flying from Washington, D.C. Dulles Intl Airport to Illinois in January is currently the most expensive (average of $208). 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

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.
Dulles Intl to Dallas/Fort Worth flights
Baltimore to Dallas/Fort Worth flights
Dulles Intl to Miami flights
Reagan-National to Miami flights
Dulles Intl to Las Vegas flights
Reagan-National to Dallas/Fort Worth flights
Baltimore to Fort Lauderdale flights
Dulles Intl to Orlando flights
Dulles Intl to Atlanta flights
Dulles Intl to Los Angeles flights
Reagan-National to Los Angeles flights
Reagan-National to Orlando flights
Baltimore to Orlando flights
Baltimore to Las Vegas flights
Dulles Intl to Fort Lauderdale flights
Baltimore to Los Angeles flights
Baltimore to Boston flights
Reagan-National to O'Hare Intl flights
Reagan-National to Atlanta flights
Baltimore to O'Hare Intl flights
Reagan-National to Las Vegas flights
Dulles Intl to O'Hare Intl flights
Reagan-National to Hobby flights
Baltimore to Miami flights
Dulles Intl to Seattle flights
Baltimore to Hobby flights
Reagan-National to San Francisco flights
Dulles Intl to Hobby flights
Reagan-National to Seattle flights
Dulles Intl to New Orleans flights
Dulles Intl to San Francisco flights
Dulles Intl to Sky Harbor Intl flights
Reagan-National to Boston flights
Dulles Intl to Tampa flights
Baltimore to San Francisco flights
Dulles Intl to Boston flights
Baltimore to Atlanta flights
Reagan-National to Fort Lauderdale flights
Dulles Intl to George Bush Intcntl flights
Baltimore to Midway flights
Baltimore to Sky Harbor Intl flights
Dulles Intl to John F Kennedy Intl flights
Dulles Intl to Denver flights
Reagan-National to Tampa flights
Reagan-National to New Orleans flights
Dulles Intl to Austin flights
Baltimore to Denver flights
Baltimore to New Orleans flights
Reagan-National to Sky Harbor Intl flights
Reagan-National to George Bush Intcntl flights

Top 3 airlines flying from Dulles Intl to Illinois

Discover the top 3 airlines that operate flights from Dulles Intl to Illinois. 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$107Average$195FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$201Average$415FlexibilityNo cancel feeOn-time69%
DeltaCheapest$234Average$327FlexibilityNo cancel feeOn-timeN/A

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.