HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$90+ 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 2/15. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ORD
Jan 22 — Jan 291
Wed 1/22
Wed 1/29
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.

Cheap flight deals from Dulles Intl to Illinois

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Illinois (USIL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 17, 2025.

Round-trip from

$179
(United Airlines)

One-way from

$90
(United Airlines)
From Washington, D.C. Dulles Intl to Illinois
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Illinois
Search Deals

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 January 17, 2025.

This United Airlines deal was found by Cheapflights users on 1/16. 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 2/1512:38 pmIAD - ORD
Nonstop2h 18mUnited Airlines
Sat 2/156:14 pmORD - IAD
Nonstop1h 55mUnited Airlines
Deal found 1/16$179
This Frontier deal was found by Cheapflights users on 1/15. 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 4/183:25 pmIAD - MDW
1 stop9h 25mFrontier
Tue 4/2912:46 pmMDW - IAD
1 stop6h 45mFrontier
Deal found 1/15$179
This Trip.com deal was found by Cheapflights users on 1/16. 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.
Sun 3/210:25 pmIAD - ORD
1 stop14h 46mFrontier
Sun 3/98:00 amORD - IAD
1 stop5h 14mFrontier
Deal found 1/16$183
This Delta deal was found by Cheapflights users on 1/16. 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 2/116:15 pmIAD - MLI
1 stop5h 23mDelta
Wed 2/125:05 pmMLI - IAD
1 stop6h 15mDelta
Deal found 1/16$199
This American Airlines deal was found by Cheapflights users on 1/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/156:31 pmIAD - PIA
1 stop4h 38mAmerican Airlines
Sat 2/224:23 pmPIA - IAD
1 stop6h 30mAmerican Airlines
Deal found 1/16$199
This Delta deal was found by Cheapflights users on 1/16. 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 2/156:00 amIAD - ORD
1 stop4h 16mDelta
Sat 2/154:15 pmORD - IAD
1 stop6h 21mDelta
Deal found 1/16$217
This Delta deal was found by Cheapflights users on 1/16. 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 2/156:00 amIAD - MDW
1 stop3h 51mDelta
Sat 2/225:05 pmMDW - IAD
1 stop5h 08mDelta
Deal found 1/16$217
This eDestinos deal was found by Cheapflights users on 1/16. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/218:46 pmIAD - ORD
1 stop13h 58mMultiple Airlines
Mon 3/247:07 pmORD - IAD
1 stop13h 02mMultiple Airlines
Deal found 1/16$222
This Booking.com deal was found by Cheapflights users on 1/14. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/77:19 pmIAD - STL
1 stop29h 12mFrontier
Wed 2/125:20 pmSTL - IAD
1 stop22h 43mFrontier
Deal found 1/14$230
This United Airlines deal was found by Cheapflights users on 1/16. 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.
Thu 2/278:35 amIAD - STL
Nonstop2h 30mUnited Airlines
Sun 3/25:36 pmSTL - IAD
1 stop5h 21mUnited Airlines
Deal found 1/16$234
This Delta deal was found by Cheapflights users on 1/16. 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.
Thu 3/66:00 amIAD - STL
1 stop4h 20mDelta
Mon 3/1010:30 amSTL - IAD
1 stop4h 53mDelta
Deal found 1/16$248
This American Airlines deal was found by Cheapflights users on 1/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/119:11 amIAD - MLI
2 stops13h 18mAmerican Airlines
Wed 2/125:00 amMLI - IAD
1 stop7h 22mAmerican Airlines
Deal found 1/16$254

Find flights from Dulles Intl to Illinois within your budget

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 17, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Sat 2/15

12:38 pm-1:56 pm

Nonstop2h 18m

Chicago O'Hare Intl

Sat 2/15

6:14 pm-9:09 pm

Nonstop1h 55m

$179

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Fri 4/18

3:25 pm-11:50 pm

1 stop9h 25m

Chicago Midway

Tue 4/29

12:46 pm-8:31 pm

1 stop6h 45m

$179

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Sun 3/2

10:25 pm-12:11 pm

1 stop14h 46m

Chicago O'Hare Intl

Sun 3/9

8:00 am-2:14 pm

1 stop5h 14m

$183

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Tue 2/11

6:15 pm-10:38 pm

1 stop5h 23m

Moline Quad-City

Wed 2/12

5:05 pm-12:20 am

1 stop6h 15m

$199

Washington, D.C.Peoria

IAD - PIA

IADPIA

Washington, D.C. Dulles Intl

Sat 2/15

6:31 pm-10:09 pm

1 stop4h 38m

Greater Peoria

Sat 2/22

4:23 pm-11:53 pm

1 stop6h 30m

$199

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Sat 2/15

6:00 am-9:16 am

1 stop4h 16m

Chicago O'Hare Intl

Sat 2/15

4:15 pm-11:36 pm

1 stop6h 21m

$217

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Sat 2/15

6:00 am-8:51 am

1 stop3h 51m

Chicago Midway

Sat 2/22

5:05 pm-11:13 pm

1 stop5h 08m

$217

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Fri 3/21

8:46 pm-9:44 am

1 stop13h 58m

Chicago O'Hare Intl

Mon 3/24

7:07 pm-9:09 am

1 stop13h 02m

$222

Washington, D.C.Moline

IAD - MLI

IADMLI

Washington, D.C. Dulles Intl

Tue 4/22

9:10 am-3:56 pm

1 stop7h 46m

Moline Quad-City

Sat 4/26

3:24 pm-10:43 pm

1 stop6h 19m

$224

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Fri 2/7

7:19 pm-11:31 pm

1 stop29h 12m

Lambert-St Louis

Wed 2/12

5:20 pm-5:03 pm

1 stop22h 43m

$230

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/16

Showing 1-10 of 48 results
1
2
3
...
5

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.

Travel insights for flights from Dulles Intl to Illinois

Get recent, data-driven insights about flights from Dulles Intl to Illinois including ideal travel times, pricing trends, and more.

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

Currently, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $245). Flying from Washington, D.C. Dulles Intl Airport to Illinois in March is currently the most expensive (average of $320). 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 17, 2025.

When flying from Washington, D.C. Dulles Intl Airport to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 17, 2025.
Peruse reviews from past customers who have flown with Delta, American Airlines and United Airlines from Washington, D.C. to Illinois to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Overall

8.1

Crew

8.7

Comfort

8.1

Boarding

8.2

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Overall

8.1

Crew

8.7

Comfort

8.1

Boarding

8.2

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,511 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Overall

8.1

Crew

8.7

Comfort

8.1

Boarding

8.2

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,964 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Overall

8.1

Crew

8.7

Comfort

8.1

Boarding

8.2

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Overall

8.1

Crew

8.7

Comfort

8.1

Boarding

8.2

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Sun Country Air
7.0
Good
384 reviews
Southwest
8.1
Very good
4,659 reviews

Entertainment

7.7

Overall

8.1

Crew

8.7

Comfort

8.1

Boarding

8.2

Food

7.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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.

  • 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 United Airlines. According to our data, you can fly for as low as $90. Users have also found prices from $90 and $109 on Frontier 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: Ethiopian Air (87%), ANA (82%), United Airlines (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 $1,108, our data indicates the cheapest price to be $130. The most popular route (Washington, D.C. Dulles Intl - Chicago O'Hare Intl), is priced around $161.

  • 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, August is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Illinois (average of $245). Flying from Washington, D.C. Dulles Intl Airport to Illinois in March is currently the most expensive (average of $320). 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.
Reagan-National to Miami flights
Baltimore to Fort Lauderdale flights
Dulles Intl to Orlando flights
Dulles Intl to Miami flights
Baltimore to Dallas/Fort Worth flights
Baltimore to Orlando flights
Reagan-National to Orlando flights
Baltimore to Miami flights
Dulles Intl to Dallas/Fort Worth flights
Dulles Intl to Las Vegas flights
Baltimore to Las Vegas flights
Dulles Intl to Fort Lauderdale flights
Dulles Intl to Atlanta flights
Reagan-National to Dallas/Fort Worth flights
Reagan-National to Fort Lauderdale flights
Baltimore to New Orleans flights
Baltimore to Hobby flights
Reagan-National to Los Angeles flights
Dulles Intl to Tampa flights
Baltimore to Detroit flights
Reagan-National to Las Vegas flights
Dulles Intl to New Orleans flights
Baltimore to Los Angeles flights
Dulles Intl to Denver flights
Baltimore to Denver flights
Baltimore to Tampa flights
Reagan-National to Hobby flights
Dulles Intl to Los Angeles flights
Reagan-National to Seattle flights
Dulles Intl to Seattle flights
Dulles Intl to Sky Harbor Intl flights
Dulles Intl to Detroit flights
Reagan-National to Denver flights
Dulles Intl to West Palm Beach flights
Dulles Intl to Hobby flights
Dulles Intl to San Francisco flights
Reagan-National to Detroit flights
Reagan-National to Atlanta flights
Reagan-National to Tampa flights
Reagan-National to San Francisco flights
Dulles Intl to O'Hare Intl flights
Dulles Intl to Salt Lake City flights
Reagan-National to O'Hare Intl flights
Baltimore to O'Hare Intl flights
Baltimore to Atlanta flights
Reagan-National to New Orleans flights
Reagan-National to Boston flights
Reagan-National to Sky Harbor Intl flights
Dulles Intl to George Bush Intcntl flights
Baltimore to Seattle flights

Top 4 airlines flying from Dulles Intl to Illinois

Discover the top 4 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 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$63Average$101FlexibilityNo cancel feeOn-time62%
DeltaCheapest$175Average$292FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$187Average$407FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$338Average$450FlexibilityNo cancel feeOn-time71%
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.