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$99+ 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 7/14. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ORD
Jul 22 — Jul 291
Wed 7/22
Wed 7/29
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 June 22, 2026.

This Kiwi.com deal was found by Cheapflights users on 6/19. 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.
Tue 6/308:57 pm
IAD
-
ORD
1 stop12h 06m
Frontier
Tue 7/78:05 am
ORD
-
IAD
1 stop10h 33m
Frontier
Deal found 6/19$248
This Expedia deal was found by Cheapflights users on 6/21. 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.
Mon 7/137:18 pm
IAD
-
ORD
1 stop28h 52m
Frontier
Wed 7/155:13 pm
ORD
-
IAD
1 stop18h 34m
Frontier
Deal found 6/21$249
This Frontier deal was found by Cheapflights users on 6/21. 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.
Tue 7/78:33 pm
IAD
-
ORD
1 stop12h 20m
Frontier
Tue 7/141:50 pm
ORD
-
IAD
1 stop8h 05m
Frontier
Deal found 6/21$250
This Orbitz deal was found by Cheapflights users on 6/21. 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 9/36:20 am
IAD
-
MDW
1 stop5h 35m
Frontier
Sat 9/511:45 am
MDW
-
IAD
1 stop10h 07m
Frontier
Deal found 6/21$250
This Kiwi.com deal was found by Cheapflights users on 6/17. 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.
Wed 7/87:49 am
IAD
-
MDW
1 stop15h 14m
Frontier
Wed 7/1512:11 pm
MDW
-
IAD
1 stop9h 44m
Frontier
Deal found 6/17$251
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 8/67:48 am
IAD
-
ORD
1 stop13h 05m
Frontier
Mon 8/108:05 am
ORD
-
IAD
1 stop10h 33m
Frontier
Deal found 6/17$252
This Trip.com deal was found by Cheapflights users on 6/21. 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 7/186:49 am
IAD
-
MDW
1 stop5h 18m
Frontier
Tue 7/216:05 am
MDW
-
IAD
1 stop9h 35m
Frontier
Deal found 6/21$252
This United Airlines deal was found by Cheapflights users on 6/19. 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 8/188:20 am
IAD
-
ORD
Nonstop2h 18m
United Airlines
Wed 8/196:30 am
ORD
-
IAD
Nonstop1h 58m
United Airlines
Deal found 6/19$253
This Delta deal was found by Cheapflights users on 6/17. 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 8/188:28 am
IAD
-
MDW
1 stop4h 23m
Delta
Tue 8/186:42 pm
MDW
-
IAD
1 stop3h 44m
Delta
Deal found 6/17$253
This United Airlines deal was found by Cheapflights users on 6/21. 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.
Sat 8/110:20 pm
IAD
-
ORD
Nonstop2h 11m
United Airlines
Mon 8/39:40 pm
ORD
-
IAD
Nonstop2h 05m
United Airlines
Deal found 6/21$254
This Super.com deal was found by Cheapflights users on 6/20. 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 7/235:40 pm
IAD
-
ORD
1 stop19h 35m
Frontier
Wed 7/291:50 pm
ORD
-
IAD
1 stop8h 05m
Frontier
Deal found 6/20$255
This Kissandfly.com deal was found by Cheapflights users on 6/21. 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.
Sat 8/810:20 pm
IAD
-
ORD
Nonstop2h 11m
Frontier
Mon 8/101:50 pm
ORD
-
IAD
1 stop8h 05m
Frontier
Deal found 6/21$256

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 June 22, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$248
(Kiwi.com)

One-way from

$99
(Delta)

Popular in

June

Cheapest in

September

Average price

$354

Good round-trip deal

$358 or less

Good one-way deal

$250 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. 14% potential increase in price ($47 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 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 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 June 22, 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

Sun 9/6

1:10 pm-2:27 pm

Nonstop2h 17m

Chicago O'Hare Intl

Fri 9/11

6:25 am-9:23 am

Nonstop1h 58m

$257

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Tue 7/21

6:00 am-10:12 am

1 stop5h 12m

Moline Quad-City

Tue 7/28

5:05 pm-12:41 am

1 stop6h 36m

$261

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Wed 7/22

10:31 am-1:56 pm

1 stop4h 25m

Moline Quad-City

Sat 7/25

1:15 pm-7:02 pm

1 stop4h 47m

$261

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Mon 10/5

10:15 am-2:29 pm

1 stop5h 14m

Chicago O'Hare Intl

Thu 10/8

5:45 pm-11:02 pm

1 stop4h 17m

$265

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Tue 7/14

10:20 pm-11:31 pm

Nonstop2h 11m

Chicago O'Hare Intl

Sun 7/19

6:29 am-9:23 am

Nonstop1h 54m

$268

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Thu 8/6

6:00 am-9:54 am

1 stop4h 54m

Lambert-St Louis

Mon 8/10

12:52 pm-8:55 pm

1 stop7h 03m

$271

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 7/16

10:20 pm-11:31 pm

Nonstop2h 11m

Chicago O'Hare Intl

Sat 7/18

3:53 pm-7:02 pm

Nonstop2h 09m

$273

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Mon 8/10

10:20 pm-11:31 pm

Nonstop2h 11m

Chicago O'Hare Intl

Fri 8/14

10:50 am-1:55 pm

Nonstop2h 05m

$277

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Sat 7/18

10:58 am-4:25 pm

1 stop6h 27m

Moline Quad-City

Mon 7/20

5:05 pm-12:41 am

1 stop6h 36m

$285

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Wed 7/22

6:00 am-10:12 am

1 stop5h 12m

Moline Quad-City

Thu 7/30

5:05 pm-12:41 am

1 stop6h 36m

$285

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/18

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

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 June 22, 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 afternoon, which is usually more expensive.

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 June 22, 2026.

The most flights from IAD to USIL are scheduled on a Sunday (32 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (6 on average).

How much does it cost to fly round-trip 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 44 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 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 June 20, 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.

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 June 22, 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
7.8
Good
8,421 reviews

Comfort

7.8

Crew

8.5

Overall

7.8

Boarding

8.1

Food

7.2

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Delta
7.8
Good
8,421 reviews
Delta
7.8
Good
8,421 reviews

Comfort

7.8

Crew

8.5

Overall

7.8

Boarding

8.1

Food

7.2

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
United Airlines
7.4
Good
9,875 reviews
Delta
7.8
Good
8,421 reviews

Comfort

7.8

Crew

8.5

Overall

7.8

Boarding

8.1

Food

7.2

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional
Frontier
5.6
Fair
2,871 reviews
Delta
7.8
Good
8,421 reviews

Comfort

7.8

Crew

8.5

Overall

7.8

Boarding

8.1

Food

7.2

Entertainment

7.8

Reviews

1 / 20
10.0
Excellent

Anonymous,May 2026

SEA - KOA

The snacks were not very good, not everyone was very friendly and professional

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 $257, 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: Egyptair (88%), Air China (82%), Ethiopian Air (80%).

  • 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 $852, our data indicates the cheapest price to be $154. 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.

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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
Reagan-National to Seattle flights
Baltimore to Seattle flights
Dulles Intl to Dallas/Fort Worth flights
Dulles Intl to Las Vegas flights
Baltimore to O'Hare Intl flights
Dulles Intl to Miami flights
Reagan-National to O'Hare Intl flights
Dulles Intl to Los Angeles flights
Baltimore to Dallas/Fort Worth flights
Baltimore to Hobby flights
Dulles Intl to Orlando flights
Baltimore to Los Angeles flights
Reagan-National to Los Angeles flights
Dulles Intl to Denver flights
Dulles Intl to Atlanta flights
Baltimore to Denver flights
Reagan-National to Miami flights
Dulles Intl to O'Hare Intl flights
Baltimore to Las Vegas flights
Reagan-National to Las Vegas flights
Reagan-National to Dallas/Fort Worth flights
Baltimore to Miami flights
Dulles Intl to Boston flights
Reagan-National to Boston flights
Baltimore to Boston flights
Reagan-National to Hobby flights
Reagan-National to San Francisco flights
Baltimore to Atlanta flights
Dulles Intl to Hobby flights
Baltimore to Orlando flights
Reagan-National to Atlanta flights
Baltimore to San Francisco flights
Reagan-National to Orlando flights
Dulles Intl to San Francisco flights
Dulles Intl to Tampa flights
Baltimore to George Bush Intcntl flights
Reagan-National to Denver flights
Baltimore to Fort Lauderdale flights
Dulles Intl to George Bush Intcntl flights
Baltimore to Tampa flights
Dulles Intl to Fort Lauderdale flights
Dulles Intl to Midway flights
Reagan-National to Fort Lauderdale flights
Reagan-National to Nashville flights
Reagan-National to George Bush Intcntl flights
Reagan-National to Tampa flights
Dulles Intl to New Orleans flights
Reagan-National to Minneapolis flights
Baltimore to Midway 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 June 22, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$98Average$201FlexibilityNo cancel feeOn-time62%
DeltaCheapest$149Average$342FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$228Average$373FlexibilityNo cancel feeOn-time69%

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