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$89+ 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 4/24. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ORD
mars 31 — avr. 71
lun. 3/31
lun. 4/7
1 adult, Economy
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Cheap 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 mars 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$177
(United Airlines)

One-way from

$89
(United Airlines)

Popular in

March

Cheapest in

September

Average price

$289

Good round-trip deal

$300 or less

Good one-way deal

$161 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Chicago (CHI) flights.
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From Washington, D.C. Dulles Intl to Illinois
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One-way flight from Washington, D.C. Dulles Intl to Illinois
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 1% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Illinois.
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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Illinois.
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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 mars 26, 2025.

This United Airlines deal was found by Cheapflights users on 3/25. 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.
mar. 4/223:30 pmIAD - ORD
Nonstop2h 14mUnited Airlines
mar. 4/299:05 pmORD - IAD
Nonstop1h 54mUnited Airlines
Deal found 3/25$177
This Delta deal was found by Cheapflights users on 3/24. 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.
jeu. 4/246:00 amIAD - ORD
1 stop4h 21mDelta
lun. 4/286:15 pmORD - IAD
1 stop3h 52mDelta
Deal found 3/24$197
This Delta deal was found by Cheapflights users on 3/25. 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.
jeu. 4/246:00 amIAD - MDW
1 stop3h 40mDelta
lun. 4/286:45 pmMDW - IAD
1 stop4h 43mDelta
Deal found 3/25$197
This Frontier deal was found by Cheapflights users on 3/25. 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.
mar. 4/88:34 pmIAD - ORD
1 stop12h 11mFrontier
dim. 4/139:25 amORD - IAD
1 stop6h 37mFrontier
Deal found 3/25$198
This Frontier deal was found by Cheapflights users on 3/25. 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.
lun. 4/73:28 pmIAD - MDW
1 stop9h 22mFrontier
lun. 4/147:05 amMDW - IAD
1 stop6h 33mFrontier
Deal found 3/25$198
This United Airlines deal was found by Cheapflights users on 3/25. 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.
ven. 4/258:35 amIAD - STL
Nonstop2h 23mUnited Airlines
lun. 4/285:35 pmSTL - IAD
1 stop5h 24mUnited Airlines
Deal found 3/25$207
This Delta deal was found by Cheapflights users on 3/24. 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.
ven. 4/2512:29 pmIAD - STL
1 stop4h 57mDelta
lun. 4/285:32 pmSTL - IAD
1 stop5h 56mDelta
Deal found 3/24$217
This Mytrip deal was found by Cheapflights users on 3/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/158:34 pmIAD - ORD
1 stop12h 11mMultiple Airlines
jeu. 4/177:10 pmORD - IAD
1 stop15h 13mMultiple Airlines
Deal found 3/25$225
This CheapOair deal was found by Cheapflights users on 3/25. 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.
lun. 4/75:54 pmIAD - STL
1 stop6h 52mFrontier
jeu. 4/104:57 pmSTL - IAD
1 stop16h 03mFrontier
Deal found 3/25$240
This Sun Country Air deal was found by Cheapflights users on 3/24. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 5/412:49 pmIAD - ORD
1 stop7h 20mSun Country Air
jeu. 5/88:05 pmORD - IAD
1 stop15h 18mSun Country Air
Deal found 3/24$255
This American Airlines deal was found by Cheapflights users on 3/25. 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.
mer. 5/75:02 amIAD - ORD
1 stop4h 59mAmerican Airlines
dim. 5/115:00 amORD - IAD
1 stop7h 22mAmerican Airlines
Deal found 3/25$292
This American Airlines deal was found by Cheapflights users on 3/25. 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.
mar. 5/61:59 pmIAD - STL
2 stops10h 52mAmerican Airlines
mer. 5/71:59 pmSTL - IAD
1 stop4h 33mAmerican Airlines
Deal found 3/25$305

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 mars 26, 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 - ORD

IADORD

Washington, D.C. Dulles Intl

mar. 4/22

8:35 am-9:46 am

Nonstop2h 11m

Chicago O'Hare Intl

mer. 4/23

1:28 pm-4:30 pm

Nonstop2h 02m

$177

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

jeu. 4/24

6:00 am-9:21 am

1 stop4h 21m

Chicago O'Hare Intl

lun. 4/28

6:15 pm-11:07 pm

1 stop3h 52m

$197

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

jeu. 4/24

6:00 am-8:40 am

1 stop3h 40m

Chicago Midway

lun. 4/28

6:45 pm-12:28 am

1 stop4h 43m

$197

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

mar. 4/8

8:34 pm-7:45 am

1 stop12h 11m

Chicago O'Hare Intl

dim. 4/13

9:25 am-5:02 pm

1 stop6h 37m

$198

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

lun. 4/7

3:28 pm-11:50 pm

1 stop9h 22m

Chicago Midway

lun. 4/14

7:05 am-2:38 pm

1 stop6h 33m

$198

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

ven. 4/25

8:35 am-9:58 am

Nonstop2h 23m

Lambert-St Louis

lun. 4/28

5:35 pm-11:59 pm

1 stop5h 24m

$207

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

ven. 4/25

12:29 pm-4:26 pm

1 stop4h 57m

Lambert-St Louis

lun. 4/28

5:32 pm-12:28 am

1 stop5h 56m

$217

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

mar. 4/15

8:34 pm-7:45 am

1 stop12h 11m

Chicago O'Hare Intl

jeu. 4/17

7:10 pm-11:23 am

1 stop15h 13m

$225

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

lun. 4/7

5:54 pm-11:46 pm

1 stop6h 52m

Lambert-St Louis

jeu. 4/10

4:57 pm-10:00 am

1 stop16h 03m

$240

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

dim. 5/4

12:49 pm-7:09 pm

1 stop7h 20m

Chicago O'Hare Intl

jeu. 5/8

8:05 pm-12:23 pm

1 stop15h 18m

$255

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 50 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, 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 $323). 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 mars 26, 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 mars 26, 2025.
Peruse reviews from past customers who have flown with Southwest, Alaska Airlines and Delta 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
4,273 reviews

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Southwest
8.1
Very good
4,273 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Alaska Airlines
8.0
Very good
9,789 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
Delta
8.0
Very good
7,891 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
United Airlines
7.4
Good
8,608 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,273 reviews

Boarding

8.2

Comfort

8.1

Overall

8.1

Crew

8.6

Entertainment

7.6

Food

7.1

Reviews

1 / 20
8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 $89. Users have also found prices from $97 and $99 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: Sun Country Air (100%), Emirates (100%), Austrian Airlines (88%).

  • 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 $1,800, our data indicates the cheapest price to be $114. 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, 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 $323). 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 Dallas/Fort Worth flights
Dulles Intl to Miami flights
Baltimore to Dallas/Fort Worth flights
Dulles Intl to Las Vegas flights
Reagan-National to Miami flights
Reagan-National to Los Angeles flights
Dulles Intl to Orlando flights
Reagan-National to Dallas/Fort Worth flights
Baltimore to Fort Lauderdale flights
Dulles Intl to Seattle flights
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Reagan-National to Las Vegas flights
Baltimore to Miami flights
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Reagan-National to Seattle flights
Dulles Intl to Hobby flights
Baltimore to Hobby flights
Reagan-National to San Francisco flights
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Reagan-National to Boston flights
Dulles Intl to O'Hare Intl flights
Dulles Intl to San Francisco flights
Baltimore to Las Vegas flights
Dulles Intl to Tampa flights
Baltimore to O'Hare Intl flights
Dulles Intl to Denver flights
Baltimore to Seattle flights
Dulles Intl to Boston flights
Baltimore to Denver flights
Reagan-National to O'Hare Intl flights
Baltimore to Los Angeles flights
Reagan-National to Hobby flights
Baltimore to Orlando flights
Baltimore to San Francisco flights
Dulles Intl to George Bush Intcntl flights
Reagan-National to Orlando flights
Baltimore to Boston flights
Dulles Intl to Sky Harbor Intl flights
Reagan-National to Denver flights
Dulles Intl to New Orleans flights
Baltimore to Atlanta flights
Reagan-National to Atlanta flights
Dulles Intl to Austin flights
Dulles Intl to Nashville flights
Dulles Intl to Charleston flights
Baltimore to George Bush Intcntl flights
Reagan-National to Fort Lauderdale flights
Reagan-National to Nashville flights
Reagan-National to Tampa flights
Baltimore to Tampa 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 mars 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$63Average$118FlexibilityNo cancel feeOn-time62%
DeltaCheapest$176Average$280FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$188Average$423FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$328Average$418FlexibilityNo cancel feeOn-time71%
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