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Dulles Intl

$87+ Cheap flights from Illinois to Dulles Intl (IAD)

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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — IAD
may. 5 — may. 121
lun. 5/5
lun. 5/12
1 adult, Economy
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Cheap flight deals from Illinois to Dulles Intl

Keep the following information in mind while searching for Illinois to Dulles Intl flight deals. Data was last updated abril 30, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$179
(United Airlines)

One-way from

$87
(Kiwi.com)

Popular in

June

Cheapest in

September

Average price

$257

Good round-trip deal

$358 or less

Good one-way deal

$149 or less
Provider with most accurate pricing for Chicago (CHI)-Washington, D.C. (WAS) flight deals.
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From Illinois to Washington, D.C. Dulles Intl
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One-way flight from Illinois to Washington, D.C. Dulles Intl
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Highest demand for flights based on searches. 3% potential increase in price ($7 potential increase over avg. RT price).
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Cheapest flight prices on average. 0% potential price decrease ($3 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Illinois to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from Illinois to Washington, D.C. Dulles Intl.
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Find flight deals from Illinois to Dulles Intl

Cheapest flights from Illinois to Dulles Intl
Explore the most affordable flight options available from Illinois to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 30, 2025.

This Frontier deal was found by Cheapflights users on 4/28. 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. 5/128:30 amMDW - IAD
1 stop4h 53mFrontier
jue. 5/153:32 pmIAD - MDW
1 stop9h 07mFrontier
Deal found 4/28$180
This Frontier deal was found by Cheapflights users on 4/29. 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.
jue. 5/156:00 amORD - IAD
1 stop7h 23mFrontier
lun. 5/193:32 pmIAD - ORD
1 stop8h 39mFrontier
Deal found 4/29$180
This United Airlines deal was found by Cheapflights users on 4/29. 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.
sáb. 5/249:31 pmORD - IAD
Nonstop1h 59mUnited Airlines
lun. 5/266:48 amIAD - ORD
Nonstop2h 14mUnited Airlines
Deal found 4/29$195
This Delta deal was found by Cheapflights users on 4/29. 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.
sáb. 5/244:15 pmMDW - IAD
1 stop6h 20mDelta
dom. 5/256:00 amIAD - MDW
1 stop6h 53mDelta
Deal found 4/29$197
This Delta deal was found by Cheapflights users on 4/29. 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.
sáb. 5/244:25 pmORD - IAD
1 stop6h 10mDelta
dom. 5/256:00 amIAD - ORD
1 stop5h 03mDelta
Deal found 4/29$197
This United Airlines deal was found by Cheapflights users on 4/29. 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.
jue. 5/295:00 amSTL - IAD
1 stop5h 55mUnited Airlines
sáb. 5/318:40 amIAD - STL
Nonstop2h 16mUnited Airlines
Deal found 4/29$204
This Booking.com deal was found by Cheapflights users on 4/28. 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.
mié. 5/215:45 pmSTL - IAD
1 stop17h 47mFrontier
sáb. 5/2411:02 amIAD - STL
1 stop13h 42mFrontier
Deal found 4/28$208
This Delta deal was found by Cheapflights users on 4/28. 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.
sáb. 5/245:40 pmSTL - IAD
1 stop4h 55mDelta
lun. 5/266:00 amIAD - STL
1 stop4h 00mDelta
Deal found 4/28$224
This Gotogate deal was found by Cheapflights users on 4/29. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 6/255:38 pmORD - IAD
1 stop5h 26mMultiple Airlines
lun. 6/3012:28 pmIAD - ORD
1 stop5h 47mMultiple Airlines
Deal found 4/29$239
This American Airlines deal was found by Cheapflights users on 4/29. 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.
sáb. 6/219:22 amORD - IAD
1 stop6h 49mAmerican Airlines
mié. 6/258:14 pmIAD - ORD
1 stop4h 43mAmerican Airlines
Deal found 4/29$251
This American Airlines deal was found by Cheapflights users on 4/29. 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.
sáb. 5/316:47 pmSTL - IAD
1 stop4h 15mAmerican Airlines
mar. 6/31:59 pmIAD - STL
1 stop6h 24mAmerican Airlines
Deal found 4/29$251
This Mytrip deal was found by Cheapflights users on 4/29. 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.
vie. 6/138:36 pmMDW - IAD
2 stops23h 17mAllegiant Air
dom. 6/153:58 pmIAD - MDW
1 stop16h 17mAllegiant Air
Deal found 4/29$256

Cheapflights Fare Finder

Customize your flight search to find flights from Illinois to Dulles Intl 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 abril 30, 2025.
Use the filters below to find and compare flights from Illinois to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Illinois

Fly to

Dulles Intl

Route

Depart

Return

Price

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

lun. 5/12

8:30 am-2:23 pm

1 stop4h 53m

Washington, D.C. Dulles Intl

jue. 5/15

3:32 pm-11:39 pm

1 stop9h 07m

$180

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

jue. 5/15

6:00 am-2:23 pm

1 stop7h 23m

Washington, D.C. Dulles Intl

lun. 5/19

3:32 pm-11:11 pm

1 stop8h 39m

$180

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

sáb. 5/24

9:31 pm-12:30 am

Nonstop1h 59m

Washington, D.C. Dulles Intl

lun. 5/26

6:48 am-8:02 am

Nonstop2h 14m

$195

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

sáb. 5/24

4:15 pm-11:35 pm

1 stop6h 20m

Washington, D.C. Dulles Intl

dom. 5/25

6:00 am-11:53 am

1 stop6h 53m

$197

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

sáb. 5/24

5:15 pm-10:54 pm

1 stop4h 39m

Washington, D.C. Dulles Intl

dom. 5/25

6:00 am-9:18 am

1 stop4h 18m

$197

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

jue. 5/29

5:00 am-11:55 am

1 stop5h 55m

Washington, D.C. Dulles Intl

sáb. 5/31

8:40 am-9:56 am

Nonstop2h 16m

$204

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

mié. 5/21

5:45 pm-12:32 pm

1 stop17h 47m

Washington, D.C. Dulles Intl

sáb. 5/24

11:02 am-11:44 pm

1 stop13h 42m

$208

St. LouisWashington, D.C.

STL - IAD

STLIAD

Lambert-St Louis

sáb. 5/24

5:40 pm-11:35 pm

1 stop4h 55m

Washington, D.C. Dulles Intl

lun. 5/26

6:00 am-9:00 am

1 stop4h 00m

$224

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

mié. 6/25

5:38 pm-12:04 am

1 stop5h 26m

Washington, D.C. Dulles Intl

lun. 6/30

12:28 pm-5:15 pm

1 stop5h 47m

$239

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

sáb. 6/21

9:22 am-5:11 pm

1 stop6h 49m

Washington, D.C. Dulles Intl

mié. 6/25

8:14 pm-11:57 pm

1 stop4h 43m

$251

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 54 results
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Best time to book a flight from Illinois to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Illinois 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 Illinois to Washington, D.C. Dulles Intl Airport

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

Currently, August is the cheapest month in which you can book a flight from Illinois to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Illinois to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $373). 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 IL to IAD?

Find hourly flight availability from Illinois to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated abril 30, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Washington, D.C. Dulles Intl Airport as you normally would.

Rainfall in Dulles Intl by month

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

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

Temperature in Dulles Intl by month

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

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated abril 30, 2025.
See what other customers who have flown with Delta, Avelo Airlines and United Airlines from Illinois to Washington, D.C. have to say. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,929 reviews

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,929 reviews
Delta
8.0
Very good
7,929 reviews

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Avelo Airlines
7.5
Good
Delta
8.0
Very good
7,929 reviews

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,696 reviews
Delta
8.0
Very good
7,929 reviews

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Allegiant Air
7.3
Good
734 reviews
Delta
8.0
Very good
7,929 reviews

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,929 reviews

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Crew

8.5

Entertainment

7.9

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

Find useful and relevant information for your journey from Illinois to Dulles Intl. 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 Illinois to Washington, D.C. Dulles Intl Airport one-way?

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $87. United Airlines flights start at $90 while deals on Delta start at $99 one-way.

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

    The most popular flight routes from Illinois to Washington, D.C. Dulles Intl Airport are Chicago O'Hare Intl - Washington, D.C. Dulles Intl, Chicago Midway - Washington, D.C. Dulles Intl and Lambert-St Louis - Washington, D.C. Dulles Intl.

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

    The top 3 most reliable airlines when flying from Illinois to Washington, D.C. Dulles Intl Airport are Air China (89%), Ethiopian Air (86%) and Austrian Airlines (84%).

  • What are the cheapest flights from Illinois to Washington, D.C. Dulles Intl Airport?

    The cheapest flight price from Illinois to Washington, D.C. Dulles Intl Airport is $114. On average you can expect to pay $1,008. The most popular route, (Chicago O'Hare Intl - Washington, D.C. Dulles Intl), can usually be booked for $179.

  • Can I find deals for flights from Illinois to Dulles Intl that include hotel bookings?

    Yes. In addition to deals on Illinois to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Dulles Intl.

  • Can I find deals for business class flights from Illinois to Dulles Intl?

    Yes. Cheapflights offers flight deals from Illinois to Dulles Intl 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 Illinois to Washington, D.C. Dulles Intl Airport?

    Currently, August is the cheapest month in which you can book a flight from Illinois to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Illinois to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $373). 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

Traveling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
Alexandria
Arlington
Woodbridge
Tysons
Fairfax
Springfield
Rockville
Fredericksburg
Silver Spring
Gaithersburg
Linthicum Heights
Falls Church
Laurel
Easton
Towson
Herndon
Sterling
Bowie
National Harbor
Oxon Hill

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Alternative routes for Illinois to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Los Angeles to Reagan-National flights
Dallas/Fort Worth to Dulles Intl flights
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Hobby to Reagan-National flights
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Orlando to Reagan-National flights
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San Diego to Reagan-National flights
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Fort Lauderdale to Baltimore flights
Midway to Baltimore flights
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Minneapolis to Dulles Intl flights
Denver to Dulles Intl flights
John F Kennedy Intl to Reagan-National flights
Hobby to Dulles Intl flights
LaGuardia to Reagan-National flights
Salt Lake City to Dulles Intl flights
George Bush Intcntl to Baltimore flights
Sky Harbor Intl to Dulles Intl flights
Midway to Dulles Intl flights
Portland to Reagan-National flights
Sky Harbor Intl to Reagan-National flights
Miami to Baltimore flights
Burbank to Baltimore flights
Minneapolis to Reagan-National flights

Top 4 airlines flying from Illinois to Dulles Intl

Discover the top 4 airlines that operate flights from Illinois to Dulles Intl. 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 abril 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$191FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$109Average$318FlexibilityNo cancel feeOn-time71%
DeltaCheapest$176Average$385FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$180Average$383FlexibilityNo cancel feeOn-time69%

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