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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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ORD
Jun 4 — Jun 111
Thu 6/4
Thu 6/11
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 May 5, 2026.

This Expedia deal was found by Cheapflights users on 5/3. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/111:17 am
IAD
-
ORD
1 stop9h 33m
Frontier
Sat 8/151:50 pm
ORD
-
IAD
1 stop8h 23m
Frontier
Deal found 5/3$224
This Frontier deal was found by Cheapflights users on 4/30. 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.
Sat 7/116:49 am
IAD
-
MDW
1 stop5h 18m
Frontier
Mon 7/206:00 am
MDW
-
IAD
1 stop10h 25m
Frontier
Deal found 4/30$224
This Frontier deal was found by Cheapflights users on 5/1. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/2411:07 am
IAD
-
ORD
1 stop9h 34m
Frontier
Thu 6/46:55 am
ORD
-
IAD
1 stop8h 26m
Frontier
Deal found 5/1$225
This Frontier deal was found by Cheapflights users on 5/4. 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 5/2911:07 am
IAD
-
MDW
1 stop11h 55m
Frontier
Mon 6/16:00 am
MDW
-
IAD
1 stop10h 27m
Frontier
Deal found 5/4$225
This Kiwi.com deal was found by Cheapflights users on 5/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/2811:07 am
IAD
-
ORD
1 stop9h 34m
Frontier
Fri 6/54:05 pm
ORD
-
IAD
2 stops17h 07m
Frontier
Deal found 5/1$226
This Frontier deal was found by Cheapflights users on 4/30. 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 5/1811:12 am
IAD
-
MDW
1 stop11h 50m
Frontier
Thu 5/216:00 am
MDW
-
IAD
1 stop5h 01m
Frontier
Deal found 4/30$226
This Delta deal was found by Cheapflights users on 4/30. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/234:24 pm
IAD
-
ORD
1 stop5h 00m
Delta
Tue 5/266:07 am
ORD
-
IAD
1 stop5h 11m
Delta
Deal found 4/30$228
This Delta deal was found by Cheapflights users on 5/1. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:08 am
IAD
-
MDW
1 stop4h 52m
Delta
Thu 5/286:36 pm
MDW
-
IAD
1 stop3h 20m
Delta
Deal found 5/1$228
This Kiwi.com deal was found by Cheapflights users on 5/1. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/2411:07 am
IAD
-
ORD
2 stops13h 06m
Frontier
Wed 6/31:29 pm
ORD
-
IAD
1 stop8h 40m
Frontier
Deal found 5/1$229
This Kiwi.com deal was found by Cheapflights users on 5/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/66:49 am
IAD
-
MDW
2 stops10h 53m
Frontier
Wed 6/106:00 am
MDW
-
IAD
1 stop10h 31m
Frontier
Deal found 5/3$229
This Priceline deal was found by Cheapflights users on 5/5. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1011:17 am
IAD
-
ORD
1 stop9h 36m
Frontier
Mon 7/137:05 am
ORD
-
IAD
1 stop9h 20m
Frontier
Deal found 5/5$230
This Travelocity deal was found by Cheapflights users on 5/5. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/1011:17 am
IAD
-
MDW
1 stop11h 51m
Frontier
Sun 7/126:00 am
MDW
-
IAD
1 stop9h 11m
Frontier
Deal found 5/5$230

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 May 5, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$224
(Expedia)

One-way from

$59
(Trip.com)

Popular in

April

Cheapest in

September

Average price

$293

Good round-trip deal

$359 or less

Good one-way deal

$253 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. 15% potential increase in price ($47 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in May 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 May 5, 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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 6/11

6:10 am-7:27 am

Nonstop2h 17m

Chicago O'Hare Intl

Tue 6/16

6:30 am-9:24 am

Nonstop1h 54m

$233

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Wed 6/3

10:11 am-4:37 pm

1 stop7h 26m

Moline Quad-City

Sat 6/6

5:17 pm-12:51 am

1 stop6h 34m

$261

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 7/2

6:00 am-9:14 am

1 stop4h 14m

Chicago Midway

Wed 7/8

9:19 am-4:41 pm

1 stop6h 22m

$263

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 5/28

6:08 am-12:20 pm

1 stop7h 12m

Lambert-St Louis

Tue 6/2

1:27 pm-6:43 pm

1 stop4h 16m

$271

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 5/23

4:24 pm-9:38 pm

1 stop6h 14m

Lambert-St Louis

Tue 5/26

6:04 pm-10:56 pm

1 stop3h 52m

$271

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 6/4

8:15 am-9:36 am

Nonstop2h 21m

Chicago O'Hare Intl

Thu 6/11

1:30 pm-4:30 pm

Nonstop2h 00m

$283

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 6/25

6:10 am-12:11 pm

1 stop7h 01m

Lambert-St Louis

Wed 7/1

12:55 pm-4:07 pm

Nonstop2h 12m

$286

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Sat 6/20

10:15 pm-11:26 pm

Nonstop2h 11m

Chicago O'Hare Intl

Mon 6/22

9:55 pm-12:59 am

Nonstop2h 04m

$289
Quickest round-trip

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Sat 8/1

5:42 pm-6:50 pm

Nonstop2h 08m

Chicago O'Hare Intl

Sat 8/8

6:30 am-9:24 am

Nonstop1h 54m

$289

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Thu 10/15

6:00 am-10:26 am

1 stop5h 26m

Moline Quad-City

Sun 10/18

5:00 pm-12:05 am

1 stop6h 05m

$291

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 60 resultsSorted by cheapest first
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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

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

Booking 81 days in advance of your planned departure date is, on average, the best time to get cheap flights from Washington, D.C. Dulles Intl Airport to Illinois. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Washington, D.C. Dulles Intl Airport to Illinois?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $38). Flying from Washington, D.C. Dulles Intl Airport to Illinois in March is currently the most expensive (average of $197). 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 May 5, 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 8% on the flight price compared to flying in the afternoon, 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 May 2, 2026.

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 May 5, 2026.

The most flights from IAD to USIL are scheduled on a Saturday (39 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (25 on average).

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 May 5, 2026.
See what other customers who have flown with Delta,United Airlines, andFrontier 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
8,459 reviews

Entertainment

7.8

Boarding

8.1

Food

7.2

Overall

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
4.0
Okay

Joel,May 2026

ATL - JAX

The flight was delivered 50 minutes and taxing took what felt like 20 minutes to takeoff.
Delta
7.9
Good
8,459 reviews
Delta
7.9
Good
8,459 reviews

Entertainment

7.8

Boarding

8.1

Food

7.2

Overall

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
4.0
Okay

Joel,May 2026

ATL - JAX

The flight was delivered 50 minutes and taxing took what felt like 20 minutes to takeoff.
United Airlines
7.4
Good
9,683 reviews
Delta
7.9
Good
8,459 reviews

Entertainment

7.8

Boarding

8.1

Food

7.2

Overall

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
4.0
Okay

Joel,May 2026

ATL - JAX

The flight was delivered 50 minutes and taxing took what felt like 20 minutes to takeoff.
Frontier
5.6
Fair
2,965 reviews
Delta
7.9
Good
8,459 reviews

Entertainment

7.8

Boarding

8.1

Food

7.2

Overall

7.9

Crew

8.5

Comfort

7.9

Reviews

1 / 20
4.0
Okay

Joel,May 2026

ATL - JAX

The flight was delivered 50 minutes and taxing took what felt like 20 minutes to takeoff.

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 $233, United Airlines can have you in Illinois from Washington, D.C. Dulles Intl Airport in 2h 17m. 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: ANA (88%), Ethiopian Air (80%), Copa Airlines (78%).

  • 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 $728, our data indicates the cheapest price to be $140. The most popular route (Washington, D.C. Dulles Intl - Chicago O'Hare Intl), is priced around $177.

  • 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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $38). Flying from Washington, D.C. Dulles Intl Airport to Illinois in March is currently the most expensive (average of $197). 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 Seattle flights
Dulles Intl to Dallas/Fort Worth flights
Baltimore to Dallas/Fort Worth flights
Dulles Intl to Las Vegas flights
Dulles Intl to Orlando flights
Reagan-National to Seattle flights
Baltimore to Miami flights
Baltimore to Hobby flights
Dulles Intl to Los Angeles flights
Reagan-National to Miami flights
Baltimore to Seattle flights
Dulles Intl to Miami flights
Baltimore to Fort Lauderdale flights
Reagan-National to Los Angeles flights
Reagan-National to Orlando flights
Baltimore to Atlanta flights
Baltimore to Las Vegas flights
Baltimore to Los Angeles flights
Reagan-National to Dallas/Fort Worth flights
Dulles Intl to Denver flights
Baltimore to O'Hare Intl flights
Baltimore to Orlando flights
Reagan-National to O'Hare Intl flights
Reagan-National to Las Vegas flights
Dulles Intl to O'Hare Intl flights
Baltimore to Denver flights
Dulles Intl to Hobby flights
Dulles Intl to San Francisco flights
Dulles Intl to Fort Lauderdale flights
Reagan-National to Hobby flights
Baltimore to George Bush Intcntl flights
Baltimore to Boston flights
Dulles Intl to Atlanta flights
Dulles Intl to Boston flights
Baltimore to San Francisco flights
Reagan-National to San Francisco flights
Dulles Intl to Tampa flights
Reagan-National to Boston flights
Reagan-National to Atlanta flights
Dulles Intl to George Bush Intcntl flights
Dulles Intl to San Diego flights
Dulles Intl to Midway flights
Reagan-National to Fort Lauderdale flights
Baltimore to Midway flights
Reagan-National to George Bush Intcntl flights
Dulles Intl to New Orleans flights
Baltimore to Tampa flights
Baltimore to Detroit flights
Dulles Intl to Sky Harbor Intl flights
Reagan-National to Nashville 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 May 5, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$90Average$198FlexibilityNo cancel feeOn-time62%
DeltaCheapest$149Average$342FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$207Average$354FlexibilityNo cancel feeOn-time69%

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