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$62+ 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 1/16. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ORD
Jan 15 — Jan 221
Thu 1/15
Thu 1/22
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 December 16, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/14. 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 12/316:05 amIAD - MDW
1 stop17h 07mFrontier
Wed 1/73:01 pmMDW - IAD
1 stop21h 00mFrontier
Deal found 12/14$191
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 12/316:05 amIAD - MDW
1 stop17h 07mFrontier
Fri 1/93:01 pmMDW - IAD
1 stop21h 15mFrontier
Deal found 12/14$203
This Frontier deal was found by Cheapflights users on 12/13. 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 12/169:00 amIAD - ORD
1 stop10h 46mFrontier
Sat 1/108:27 pmORD - IAD
1 stop10h 13mFrontier
Deal found 12/13$213
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 12/316:05 amIAD - MDW
1 stop17h 07mFrontier
Mon 1/126:10 amMDW - IAD
1 stop8h 17mFrontier
Deal found 12/14$213
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 12/316:05 amIAD - MDW
1 stop17h 07mFrontier
Sun 1/114:21 pmMDW - IAD
1 stop14h 19mFrontier
Deal found 12/14$214
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 12/316:05 amIAD - MDW
1 stop17h 07mFrontier
Thu 1/812:41 pmMDW - IAD
2 stops18h 14mFrontier
Deal found 12/14$220
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 12/308:15 pmIAD - MDW
2 stops19h 22mFrontier
Wed 1/73:01 pmMDW - IAD
1 stop21h 00mFrontier
Deal found 12/14$221
This United Airlines deal was found by Cheapflights users on 12/14. 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.
Wed 12/245:31 pmIAD - ORD
Nonstop2h 21mUnited Airlines
Wed 12/312:30 pmORD - IAD
Nonstop2h 00mUnited Airlines
Deal found 12/14$223
This Kiwi.com deal was found by Cheapflights users on 12/14. 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 12/308:15 pmIAD - MDW
2 stops19h 22mFrontier
Fri 1/93:01 pmMDW - IAD
1 stop21h 15mFrontier
Deal found 12/14$233
This Frontier deal was found by Cheapflights users on 12/14. 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 12/299:58 pmIAD - ORD
1 stop12h 04mFrontier
Mon 1/56:00 amORD - IAD
1 stop11h 16mFrontier
Deal found 12/14$234
This Expedia deal was found by Cheapflights users on 12/14. 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 12/299:58 pmIAD - MDW
1 stop25h 00mFrontier
Mon 1/56:12 amMDW - IAD
1 stop11h 04mFrontier
Deal found 12/14$234
This CheapOair deal was found by Cheapflights users on 12/14. 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.
Tue 12/309:58 pmIAD - ORD
1 stop13h 20mFrontier
Mon 1/56:00 amORD - IAD
1 stop11h 16mFrontier
Deal found 12/14$235

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 December 16, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$142
(Kiwi.com)

One-way from

$62
(Trip.com)

Popular in

November

Cheapest in

September

Average price

$269

Good round-trip deal

$353 or less

Good one-way deal

$208 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. 4% potential increase in price ($12 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 December 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 December 16, 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

Thu 3/5

11:22 am-10:29 pm

1 stop12h 07m

Chicago Midway

Wed 3/11

11:19 am-7:24 am

1 stop19h 05m

$162

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Fri 1/16

10:08 pm-7:27 am

1 stop10h 19m

Chicago Midway

Mon 1/19

8:28 am-9:13 pm

1 stop11h 45m

$205

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Fri 2/6

5:33 pm-10:19 pm

1 stop5h 46m

Chicago Midway

Sun 2/8

5:01 pm-4:28 pm

1 stop22h 27m

$211

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Fri 1/23

9:35 am-7:52 pm

1 stop11h 17m

Chicago Midway

Sun 1/25

6:20 am-4:33 pm

1 stop9h 13m

$232

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 2/12

10:30 pm-11:43 pm

Nonstop2h 13m

Chicago O'Hare Intl

Sat 2/14

8:50 am-11:49 am

Nonstop1h 59m

$246

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Tue 1/6

6:00 am-9:41 am

1 stop4h 41m

Chicago O'Hare Intl

Sat 1/10

5:59 pm-11:37 pm

1 stop4h 38m

$251

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Wed 1/28

5:26 pm-9:05 pm

1 stop4h 39m

Chicago O'Hare Intl

Wed 2/4

6:50 am-11:52 am

1 stop4h 02m

$251

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Wed 1/7

6:00 am-8:52 am

1 stop3h 52m

Chicago Midway

Sat 1/10

9:32 am-4:46 pm

1 stop6h 14m

$251

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Tue 2/17

6:00 am-11:59 am

1 stop6h 59m

Chicago Midway

Sat 2/21

9:34 am-4:28 pm

1 stop5h 54m

$251

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Wed 1/28

6:00 am-8:52 am

1 stop3h 52m

Chicago Midway

Wed 2/4

6:35 pm-11:06 pm

1 stop3h 31m

$251

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

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 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 December 16, 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 39% 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. Sunday 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 December 16, 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
8,010 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Comfort

7.9

Food

7.3

Boarding

8.1

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
8,010 reviews
Delta
7.9
Good
8,010 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Comfort

7.9

Food

7.3

Boarding

8.1

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
9,094 reviews
Delta
7.9
Good
8,010 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Comfort

7.9

Food

7.3

Boarding

8.1

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
5.8
Fair
3,082 reviews
Delta
7.9
Good
8,010 reviews

Crew

8.5

Entertainment

7.9

Overall

7.9

Comfort

7.9

Food

7.3

Boarding

8.1

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 $246, 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: Air China (91%), Egyptair (89%), ANA (84%).

  • 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 $949, our data indicates the cheapest price to be $115. The most popular route (Washington, D.C. Dulles Intl - Chicago O'Hare Intl), is priced around $212.

  • 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 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.
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Reagan-National to Salt Lake City flights
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Reagan-National to Tampa flights
Dulles Intl to Denver flights
Reagan-National to San Francisco flights
Baltimore to San Francisco flights
Reagan-National to Atlanta flights
Baltimore to Seattle flights
Baltimore to Sky Harbor Intl flights
Reagan-National to West Palm Beach flights
Baltimore to O'Hare Intl flights
Reagan-National to O'Hare Intl flights
Dulles Intl to George Bush Intcntl flights
Reagan-National to George Bush Intcntl flights
Reagan-National to Sky Harbor Intl flights
Reagan-National to New Orleans flights
Baltimore to Salt Lake City flights
Dulles Intl to Honolulu 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 December 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$122Average$196FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$206Average$368FlexibilityNo cancel feeOn-time69%
DeltaCheapest$234Average$327FlexibilityNo cancel feeOn-timeN/A

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