Illinois

$87+ 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 9/17. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — ORD
Jul 16 — Jul 231
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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 July 11, 2025.

Round-trip from

$143
(United Airlines)

One-way from

$89
(Mytrip)

Popular in

April

Cheapest in

September

Average price

$263

Good round-trip deal

$301 or less

Good one-way deal

$168 or less
From Washington, D.C. Dulles Intl to Illinois
One-way flight from Washington, D.C. Dulles Intl to Illinois
Highest demand for flights based on searches. 6% potential increase in price ($17 potential increase over avg. RT price).
Cheapest flight prices on average. 0% potential price decrease ($2 potential savings vs. average RT price).
Average for round-trip flights in July 2025
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Illinois.
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Illinois.

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 July 11, 2025.

This United Airlines deal was found by Cheapflights users on 7/10. 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 9/1110:10 pmIAD - ORD
Nonstop2h 05mUnited Airlines
Sun 9/148:50 amORD - IAD
Nonstop2h 05mUnited Airlines
Deal found 7/10$143
This Frontier deal was found by Cheapflights users on 7/10. 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.
Thu 8/216:10 amIAD - ORD
1 stop5h 29mFrontier
Sat 8/236:00 amORD - IAD
1 stop9h 30mFrontier
Deal found 7/10$154
This Frontier deal was found by Cheapflights users on 7/10. 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.
Thu 8/215:18 pmIAD - MDW
1 stop6h 50mFrontier
Mon 8/256:15 amMDW - IAD
1 stop9h 15mFrontier
Deal found 7/10$154
This Mytrip deal was found by Cheapflights users on 7/8. 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.
Mon 8/181:22 pmIAD - MDW
1 stop5h 55mAllegiant Air
Mon 8/259:32 amMDW - IAD
1 stop4h 51mAllegiant Air
Deal found 7/8$180
This Booking.com deal was found by Cheapflights users on 7/10. 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.
Sat 8/236:10 amIAD - STL
1 stop8h 23mFrontier
Sun 8/2410:17 amSTL - IAD
1 stop22h 10mFrontier
Deal found 7/10$190
This United Airlines deal was found by Cheapflights users on 7/9. 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 8/238:40 amIAD - STL
Nonstop2h 22mUnited Airlines
Mon 8/259:17 amSTL - IAD
1 stop5h 35mUnited Airlines
Deal found 7/9$194
This Delta deal was found by Cheapflights users on 7/10. 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 8/126:00 amIAD - STL
1 stop4h 57mDelta
Fri 8/156:00 pmSTL - IAD
1 stop3h 55mDelta
Deal found 7/10$197
This Delta deal was found by Cheapflights users on 7/10. 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 8/55:20 pmIAD - ORD
1 stop7h 49mDelta
Fri 8/87:10 amORD - IAD
1 stop3h 22mDelta
Deal found 7/10$197
This Delta deal was found by Cheapflights users on 7/10. 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 8/56:00 amIAD - MDW
1 stop3h 44mDelta
Wed 8/136:04 amMDW - IAD
1 stop4h 40mDelta
Deal found 7/10$197
This Mytrip deal was found by Cheapflights users on 7/10. 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.
Thu 8/214:56 pmIAD - ORD
2 stops24h 14mMultiple Airlines
Sat 8/2311:36 amORD - IAD
2 stops22h 08mMultiple Airlines
Deal found 7/10$203
This eDestinos deal was found by Cheapflights users on 7/7. 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 8/151:22 pmIAD - MDW
1 stop5h 55mMultiple Airlines
Tue 8/199:16 amMDW - IAD
1 stop11h 18mMultiple Airlines
Deal found 7/7$222
This Delta deal was found by Cheapflights users on 7/10. 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 8/2312:39 pmIAD - MLI
1 stop4h 40mDelta
Sat 9/66:00 amMLI - IAD
1 stop4h 23mDelta
Deal found 7/10$249

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 July 11, 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

Thu 9/11

10:10 pm-11:15 pm

Nonstop2h 05m

Chicago O'Hare Intl

Sun 9/14

8:50 am-11:55 am

Nonstop2h 05m

$143

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 8/21

6:10 am-10:39 am

1 stop5h 29m

Chicago O'Hare Intl

Sat 8/23

6:00 am-4:30 pm

1 stop9h 30m

$154

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Thu 8/21

5:18 pm-11:08 pm

1 stop6h 50m

Chicago Midway

Mon 8/25

6:15 am-4:30 pm

1 stop9h 15m

$154

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Mon 8/18

1:22 pm-6:17 pm

1 stop5h 55m

Chicago Midway

Mon 8/25

9:32 am-3:23 pm

1 stop4h 51m

$180

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 8/23

6:10 am-1:33 pm

1 stop8h 23m

Lambert-St Louis

Sun 8/24

10:17 am-9:27 am

1 stop22h 10m

$190

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Sat 8/23

8:40 am-10:02 am

Nonstop2h 22m

Lambert-St Louis

Mon 8/25

9:17 am-3:52 pm

1 stop5h 35m

$194

Washington, D.C.St. Louis

IAD - STL

IADSTL

Washington, D.C. Dulles Intl

Tue 8/12

6:00 am-9:57 am

1 stop4h 57m

Lambert-St Louis

Fri 8/15

6:00 pm-10:55 pm

1 stop3h 55m

$197

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Tue 8/5

5:23 pm-8:15 pm

1 stop3h 52m

Chicago O'Hare Intl

Wed 8/13

7:15 am-11:32 am

1 stop3h 17m

$197

Washington, D.C.Chicago

IAD - MDW

IADMDW

Washington, D.C. Dulles Intl

Tue 8/5

6:00 am-8:44 am

1 stop3h 44m

Chicago Midway

Wed 8/13

6:04 am-11:44 am

1 stop4h 40m

$197

Washington, D.C.Chicago

IAD - ORD

IADORD

Washington, D.C. Dulles Intl

Thu 8/21

4:56 pm-4:10 pm

2 stops24h 14m

Chicago O'Hare Intl

Sat 8/23

11:36 am-10:44 am

2 stops22h 08m

$203

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/10

Showing 1-10 of 49 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 $321). 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 July 11, 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.

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 July 11, 2025.

The most flights from IAD to USIL are scheduled on a Thursday (30 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (20 on average).

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 July 11, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines 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.

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.
8.0
Very good

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Comfort

8.0

Food

7.0

Crew

8.6

Boarding

8.1

Overall

8.0

Entertainment

7.6

Reviews

1 / 20
8.0
Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

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 Allegiant Air. According to our data, you can fly for as low as $89. Users have also found prices from $91 and $94 on Frontier and United Airlines, respectively.

  • What are the most popular routes from Washington, D.C. Dulles Intl Airport to Illinois?

  • 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%), Ethiopian Air (80%), Air China (79%).

  • 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 $1,584, 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 $93.

  • 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 $321). 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.

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 July 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$87Average$191FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$161Average$414FlexibilityNo cancel feeOn-time69%
DeltaCheapest$176Average$368FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$304Average$407FlexibilityNo cancel feeOn-time71%

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