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$59+ 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 3/11. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ORD
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheap 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 January 29, 2026.

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.
Mon 2/2311:41 am
IAD
-
ORD
1 stop11h 58m
Frontier
Fri 2/274:42 pm
ORD
-
IAD
1 stop15h 52m
Frontier
Deal found 1/27$148
This Priceline 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/2311:41 am
IAD
-
MDW
1 stop9h 06m
Frontier
Mon 3/26:00 am
MDW
-
IAD
1 stop9h 08m
Frontier
Deal found 1/27$148
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.
Mon 2/235:22 pm
IAD
-
ORD
1 stop6h 17m
Frontier
Mon 3/25:05 am
ORD
-
IAD
1 stop10h 03m
Frontier
Deal found 1/27$149
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2611:22 am
IAD
-
MDW
1 stop5h 54m
Frontier
Mon 3/26:00 am
MDW
-
IAD
1 stop9h 08m
Frontier
Deal found 1/28$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.
Mon 2/235:22 pm
IAD
-
ORD
1 stop6h 17m
Multiple Airlines
Thu 2/267:23 pm
ORD
-
IAD
1 stop21h 44m
Multiple Airlines
Deal found 1/27$151
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.
Sat 2/2110:29 am
IAD
-
ORD
1 stop13h 10m
Multiple Airlines
Wed 2/258:16 pm
ORD
-
IAD
2 stops19h 27m
Multiple Airlines
Deal found 1/28$152
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.
Mon 2/235:22 pm
IAD
-
ORD
1 stop18h 29m
Frontier
Sat 2/284:42 pm
ORD
-
IAD
1 stop16h 48m
Frontier
Deal found 1/27$156
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 2/2611:22 am
IAD
-
MDW
1 stop5h 54m
Frontier
Thu 3/57:30 am
MDW
-
IAD
1 stop8h 13m
Frontier
Deal found 1/28$156
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2611:22 am
IAD
-
ORD
1 stop12h 17m
Frontier
Wed 3/48:30 am
ORD
-
IAD
1 stop23h 55m
Frontier
Deal found 1/27$159
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.
Mon 2/2311:41 am
IAD
-
ORD
1 stop11h 58m
Multiple Airlines
Wed 2/257:23 pm
ORD
-
IAD
2 stops20h 20m
Multiple Airlines
Deal found 1/28$160
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.
Fri 2/275:37 pm
IAD
-
MDW
1 stop6h 00m
Frontier
Thu 3/57:30 am
MDW
-
IAD
1 stop8h 13m
Frontier
Deal found 1/28$160
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 2/2611:22 am
IAD
-
ORD
1 stop12h 17m
Multiple Airlines
Thu 3/512:44 pm
ORD
-
IAD
1 stop17h 40m
Multiple Airlines
Deal found 1/26$161

Find 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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$148
(Kiwi.com)

One-way from

$59
(WAYA)

Popular in

December

Cheapest in

September

Average price

$253

Good round-trip deal

$342 or less

Good one-way deal

$246 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 ($4 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 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 January 29, 2026.
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

Thu 2/12

5:37 pm-10:34 pm

1 stop5h 57m

Chicago Midway

Mon 2/23

6:00 am-4:08 pm

1 stop9h 08m

$193

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Sat 2/21

10:30 pm-11:43 pm

Nonstop2h 13m

Chicago O'Hare Intl

Tue 2/24

1:02 pm-4:05 pm

Nonstop2h 03m

$214

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 2/26

11:22 am-10:29 pm

1 stop12h 07m

Chicago Midway

Thu 3/5

5:16 pm-7:24 am

2 stops13h 08m

$214

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 4/30

8:09 am-8:04 am

1 stop24h 55m

Chicago Midway

Sun 5/3

9:14 am-7:27 am

1 stop21h 13m

$215

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Wed 2/25

6:00 am-8:54 am

1 stop3h 54m

Chicago Midway

Wed 3/4

6:20 pm-11:09 pm

1 stop3h 49m

$217

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 2/12

5:37 pm-10:34 pm

1 stop5h 57m

Chicago Midway

Sat 2/21

6:00 am-10:15 am

1 stop27h 15m

$220

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Sat 3/21

10:31 pm-11:44 pm

Nonstop2h 13m

Chicago O'Hare Intl

Tue 3/24

1:06 pm-4:09 pm

Nonstop2h 03m

$237

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Sat 3/14

8:09 am-9:45 pm

1 stop14h 36m

Chicago Midway

Sun 3/22

6:20 am-12:31 am

1 stop17h 11m

$237

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Sat 2/21

5:17 pm-6:41 pm

Nonstop2h 24m

Chicago O'Hare Intl

Mon 2/23

6:20 pm-9:18 pm

Nonstop1h 58m

$238

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Wed 3/4

7:35 pm-11:56 pm

1 stop5h 21m

Chicago O'Hare Intl

Sat 3/7

5:25 am-11:35 am

1 stop5h 10m

$241

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

Showing 1-10 of 60 results
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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 $115). Flying from Washington, D.C. Dulles Intl Airport to Illinois in January is currently the most expensive (average of $225). 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 January 29, 2026.

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 13% 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 February 16, 2025.

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

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

Explore weekly flight availability from Dulles Intl to Illinois. 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 IAD to USIL are scheduled on a Tuesday (20 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 on average).

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 January 29, 2026.
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
8,127 reviews

Overall

7.9

Food

7.2

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Delta
7.9
Good
8,127 reviews
Delta
7.9
Good
8,127 reviews

Overall

7.9

Food

7.2

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
United Airlines
7.4
Good
9,215 reviews
Delta
7.9
Good
8,127 reviews

Overall

7.9

Food

7.2

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.
Frontier
5.7
Fair
3,056 reviews
Delta
7.9
Good
8,127 reviews

Overall

7.9

Food

7.2

Boarding

8.1

Comfort

7.9

Crew

8.5

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Jim,Nov 2025

AVL - ATL

The exit row seats without a seat in front are great for leg room but don’t have a fold out entertainment console so you’re forced to use the screen several feet in front of you (there is, at least, a remote). Best to bring a tablet loaded with entertainment or a book.

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 $214, Frontier can have you in Illinois from Washington, D.C. Dulles Intl Airport in 2h 13m. 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 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: Ethiopian Air (87%), Air China (86%), Egyptair (85%).

  • 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 $588, our data indicates the cheapest price to be $156. The most popular route (Washington, D.C. Dulles Intl - Chicago O'Hare Intl), is priced around $197.

  • 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 $115). Flying from Washington, D.C. Dulles Intl Airport to Illinois in January is currently the most expensive (average of $225). 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

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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 Miami flights
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Baltimore to Miami flights
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Baltimore to Fort Lauderdale flights
Reagan-National to Orlando flights
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Baltimore to Las Vegas flights
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Reagan-National to Seattle flights
Reagan-National to Dallas/Fort Worth flights
Reagan-National to San Francisco flights
Baltimore to Tampa flights
Baltimore to Dallas/Fort Worth flights
Baltimore to Atlanta flights
Dulles Intl to Denver flights
Dulles Intl to Hobby flights
Reagan-National to O'Hare Intl flights
Baltimore to Denver flights
Dulles Intl to New Orleans flights
Reagan-National to Tampa flights
Baltimore to O'Hare Intl flights
Dulles Intl to San Francisco flights
Dulles Intl to O'Hare Intl flights
Baltimore to San Francisco flights
Baltimore to Sky Harbor Intl flights
Baltimore to Hobby flights
Dulles Intl to Salt Lake City flights
Reagan-National to Atlanta flights
Baltimore to Boston flights
Reagan-National to George Bush Intcntl flights
Reagan-National to Denver flights
Dulles Intl to George Bush Intcntl flights
Baltimore to New Orleans flights
Reagan-National to West Palm Beach flights
Baltimore to Seattle flights
Dulles Intl to Fort Myers flights
Dulles Intl to Austin 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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$106Average$195FlexibilityNo cancel feeOn-time62%
DeltaCheapest$194Average$327FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$203Average$369FlexibilityNo cancel feeOn-time69%

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