How long is the flight from Chicago to Washington, D.C. Dulles Intl Airport?

For as low as $177, United Airlines can have you in Washington, D.C. Dulles Intl Airport from Chicago in 2h 06m. The distance between Chicago and Washington, D.C. Dulles Intl Airport is about 587 mi. This flight may include one or multiple stops.

What are the cheapest airlines flying from Chicago to Washington, D.C. Dulles Intl Airport round-trip?

Flying on Frontier is currently your cheapest option to Washington, D.C. Dulles Intl Airport, with prices starting at $80. Another option worth looking into is United Airlines, starting at $217 round trip. Frontier is 77% cheaper than the average price of flights available within the next 90 days to this destination.

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.

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).

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

Looking at all options, your cheapest flight can be booked for $128. While the most popular route (Chicago O'Hare Intl - Washington, D.C. Dulles Intl) can be booked for $175 on average, our data indicates $1,680 when flying from Chicago to Washington, D.C. Dulles Intl Airport.

Most accurate provider : When it comes to deals on Chicago-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Chicago-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Chicago-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Chicago-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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

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

How can I find direct flights from Chicago to Dulles Intl?

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

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

Yes. Cheapflights offers flight deals from Chicago 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.

$89+ Cheap Flights from Chicago to Washington, D.C. Dulles Intl Airport

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Cheapflights Tip: The best prices from Chicago to Washington, D.C. Dulles Intl are usually found in September or May, booked 65 days in advance, depart on a Friday or Monday and return on a Thursday

Cheap flight deals from Chicago to Dulles Intl

Cheapest

Best

Last-minute

One-way

Cheapest flights from Chicago to Dulles Intl
Explore the most affordable flight options available from Chicago to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 29, 2026.

Thu 10/16:25 am -

1 stop9h 53m

Tue 10/67:50 am -

1 stop10h 56m

Deal found 8/28

$177

Wed 9/2310:50 am -

Nonstop2h 05m

Sat 9/261:10 pm -

Nonstop2h 16m

Deal found 8/25

$177

Thu 10/16:25 am -

1 stop9h 53m

Mon 10/57:50 am -

1 stop11h 01m

Deal found 8/27

$178

Tue 10/136:00 am -

1 stop10h 13m

Mon 10/1912:30 pm -

1 stop13h 01m

Deal found 8/27

$178

Sat 10/109:45 pm -

Nonstop2h 05m

Sat 10/1711:12 am -

1 stop21h 19m

Deal found 8/26

$183

Sat 10/178:04 am -

1 stop11h 07m

Mon 10/1912:30 pm -

1 stop13h 01m

Deal found 8/27

$184

Sat 10/178:04 am -

1 stop11h 07m

Thu 10/2212:30 pm -

1 stop12h 56m

Deal found 8/28

$185

Fri 9/186:25 am -

1 stop9h 53m

Sat 9/197:50 am -

1 stop11h 01m

Deal found 8/27

$187

Fri 9/257:11 am -

1 stop11h 58m

Thu 10/112:30 pm -

1 stop8h 05m

Deal found 8/26

$187

Sat 9/266:25 am -

1 stop9h 53m

Mon 9/287:50 am -

1 stop11h 01m

Deal found 8/29

$188

Tue 10/66:00 am -

1 stop8h 34m

Mon 10/1211:12 am -

1 stop21h 39m

Deal found 8/28

$188

Tue 9/156:25 am -

1 stop9h 53m

Thu 9/177:50 am -

1 stop10h 56m

Deal found 8/27

$189

Best flights from Chicago to Dulles Intl
Discover carefully curated flight deals from Chicago to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 29, 2026.

Thu 9/2412:55 pm -

Nonstop2h 06m

Thu 10/16:10 am -

Nonstop2h 15m

Deal found 8/25

$177

Tue 10/136:44 pm -

1 stop3h 32m

Wed 10/146:00 am -

1 stop5h 03m

Deal found 8/24

$197

Thu 10/296:04 am -

1 stop4h 28m

Sat 10/3111:10 am -

1 stop5h 07m

Deal found 8/24

$197

Sat 10/176:44 pm -

1 stop3h 32m

Wed 10/216:00 am -

1 stop6h 54m

Deal found 8/26

$197

Wed 10/216:44 pm -

1 stop3h 32m

Sat 10/246:12 pm -

1 stop5h 21m

Deal found 8/27

$197

Wed 10/217:47 pm -

Nonstop2h 05m

Sat 10/241:10 pm -

Nonstop2h 16m

Deal found 8/27

$257

Sat 10/39:29 am -

1 stop6h 01m

Wed 10/76:05 am -

1 stop4h 12m

Deal found 8/24

$197

Sat 10/106:06 pm -

Nonstop2h 05m

Thu 10/156:10 am -

Nonstop2h 15m

Deal found 8/24

$257

Thu 11/56:44 pm -

1 stop3h 32m

Mon 11/95:00 pm -

1 stop6h 54m

Deal found 8/26

$197

Sat 10/105:29 pm -

1 stop4h 47m

Tue 10/135:13 pm -

1 stop4h 17m

Deal found 8/24

$197

Thu 10/18:50 am -

Nonstop2h 05m

Sun 10/43:47 pm -

Nonstop2h 18m

Deal found 8/25

$283

Wed 12/239:35 pm -

Nonstop2h 03m

Sun 12/2712:35 pm -

1 stop3h 36m

Deal found 8/26

$293

Fri 11/66:44 pm -

1 stop3h 32m

Mon 11/95:00 pm -

1 stop6h 54m

Deal found 8/27

$236

Fri 11/65:27 am -

1 stop7h 42m

Mon 11/98:00 am -

1 stop7h 49m

Deal found 8/25

$236

Wed 9/238:05 am -

1 stop5h 06m

Fri 9/255:15 pm -

1 stop4h 15m

Deal found 8/27

$236

Tue 11/246:49 am -

1 stop6h 05m

Tue 12/111:30 am -

1 stop5h 47m

Deal found 8/24

$268

Wed 9/96:05 am -

1 stop7h 06m

Tue 9/1512:26 pm -

1 stop4h 49m

Deal found 8/24

$291

Wed 9/96:40 am -

1 stop6h 31m

Tue 9/153:15 pm -

1 stop6h 41m

Deal found 8/24

$291

Wed 12/95:05 pm -

1 stop5h 18m

Fri 12/113:00 pm -

1 stop5h 05m

Deal found 8/27

$311

Thu 9/249:29 am -

1 stop6h 01m

Mon 10/266:05 am -

1 stop4h 12m

Deal found 8/25

$318

Thu 10/86:44 pm -

1 stop3h 32m

Mon 10/126:05 am -

1 stop4h 12m

Deal found 8/27

$318

Fri 11/139:30 am -

1 stop5h 56m

Sun 11/156:00 am -

1 stop5h 24m

Deal found 8/24

$332

Last-minute flights from Chicago to Dulles Intl
Discover last-minute flight deals from Chicago to Dulles Intl. Data last updated August 29, 2026 and is based on user searches.

Tue 9/156:25 am -

1 stop9h 53m

Thu 9/177:50 am -

1 stop10h 56m

Deal found 8/27

$189

Tue 9/151:21 pm -

1 stop15h 59m

Thu 9/1711:12 am -

1 stop12h 47m

Deal found 8/27

$189

Thu 9/176:25 am -

1 stop9h 53m

Mon 9/217:50 am -

1 stop11h 01m

Deal found 8/27

$177

Thu 9/176:00 am -

1 stop4h 45m

Mon 9/215:15 pm -

1 stop4h 15m

Deal found 8/27

$197

Fri 9/186:25 am -

1 stop9h 53m

Sat 9/197:50 am -

1 stop11h 01m

Deal found 8/27

$187

Sat 9/199:29 am -

1 stop6h 01m

Mon 9/216:10 am -

1 stop3h 57m

Deal found 8/26

$197

Mon 9/218:55 pm -

1 stop32h 25m

Mon 9/286:13 pm -

1 stop22h 07m

Deal found 8/25

$194

Tue 9/226:00 am -

1 stop8h 34m

Fri 9/2512:30 pm -

1 stop13h 15m

Deal found 8/28

$193

Wed 9/2310:50 am -

Nonstop2h 05m

Sat 9/261:10 pm -

Nonstop2h 16m

Deal found 8/25

$177

Wed 9/236:25 am -

1 stop9h 53m

Sat 9/267:50 am -

1 stop11h 01m

Deal found 8/28

$195

Fri 9/257:11 am -

1 stop11h 58m

Thu 10/112:30 pm -

1 stop8h 05m

Deal found 8/26

$187

Sat 9/266:25 am -

1 stop9h 53m

Mon 9/287:50 am -

1 stop11h 01m

Deal found 8/29

$188

One-way flights from Chicago to Dulles Intl
Search for one-way flight options from Chicago to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated August 29, 2026.

Thu 9/2412:55 pm -

Nonstop2h 06m

Deal found 8/27

$89

Tue 9/296:25 am -

1 stop9h 53m

Deal found 8/28

$95

Mon 11/237:53 pm -

1 stop12h 23m

Deal found 8/24

$96

Thu 11/128:00 am -

1 stop11h 11m

Deal found 8/24

$98

Thu 10/156:44 pm -

1 stop3h 32m

Deal found 8/25

$99

Thu 9/176:00 am -

1 stop4h 45m

Deal found 8/27

$99

Sat 9/511:45 am -

1 stop10h 07m

Deal found 8/27

$104

Tue 10/279:53 am -

1 stop6h 19m

Deal found 8/29

$105

Wed 9/167:11 am -

1 stop11h 58m

Deal found 8/27

$105

Fri 9/1810:26 am -

1 stop5h 52m

Deal found 8/24

$107

Fri 11/610:26 am -

1 stop5h 46m

Deal found 8/27

$108

Mon 9/2110:26 am -

1 stop5h 52m

Deal found 8/29

$109

Find flight deals from Chicago to Dulles Intl

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$177 (Trip.com)
One-way from	$89 (United Airlines)
Popular in	January
Cheapest in	September
Average price	$426
Good round-trip deal	$339 or less
Good one-way deal	$271 or less

Provider with most accurate pricing for Chicago (CHI)-Washington, D.C. Dulles Intl flight deals.

Search Deals

Provider most trusted by Cheapflights users for Chicago (CHI)-Washington, D.C. Dulles Intl flights.

Search Deals

From Chicago (CHI) to Washington, D.C. Dulles Intl

Search Deals

One-way flight from Chicago (CHI) to Washington, D.C. Dulles Intl

Search Deals

Highest demand for flights based on searches. 3% potential increase in price ($13 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 2026

Search Deals

Price to beat on a round-trip flight from Chicago (CHI) to Washington, D.C. Dulles Intl.

Search Deals

Price to beat on a one-way flight from Chicago (CHI) to Washington, D.C. Dulles Intl.

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Chicago to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoWashington, D.C.

ORD Chicago O'Hare Intl - IAD Washington, D.C. Dulles Intl

ORDIAD

Chicago O'Hare Intl

Thu 9/24

12:55 pm-4:01 pm

Nonstop2h 06m

Washington, D.C. Dulles Intl

Thu 10/1

6:10 am-7:25 am

Nonstop2h 15m

$177

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Tue 10/13

6:44 pm-11:16 pm

1 stop3h 32m

Washington, D.C. Dulles Intl

Wed 10/14

6:00 am-10:03 am

1 stop5h 03m

$197

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Thu 10/29

6:04 am-11:32 am

1 stop4h 28m

Washington, D.C. Dulles Intl

Sat 10/31

11:10 am-3:17 pm

1 stop5h 07m

$197

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Sat 10/17

6:44 pm-11:16 pm

1 stop3h 32m

Washington, D.C. Dulles Intl

Wed 10/21

6:00 am-11:54 am

1 stop6h 54m

$197

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Wed 10/21

6:44 pm-11:16 pm

1 stop3h 32m

Washington, D.C. Dulles Intl

Sat 10/24

6:12 pm-10:33 pm

1 stop5h 21m

$197

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Sat 10/3

9:29 am-4:30 pm

1 stop6h 01m

Washington, D.C. Dulles Intl

Wed 10/7

6:05 am-9:17 am

1 stop4h 12m

$197

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Thu 11/5

6:44 pm-11:16 pm

1 stop3h 32m

Washington, D.C. Dulles Intl

Mon 11/9

5:00 pm-10:54 pm

1 stop6h 54m

$197

ChicagoWashington, D.C.

ORD Chicago O'Hare Intl - IAD Washington, D.C. Dulles Intl

ORDIAD

Chicago O'Hare Intl

Sat 10/10

5:29 pm-11:16 pm

1 stop4h 47m

Washington, D.C. Dulles Intl

Tue 10/13

5:13 pm-8:30 pm

1 stop4h 17m

$197

ChicagoWashington, D.C.

MDW Chicago Midway - IAD Washington, D.C. Dulles Intl

MDWIAD

Chicago Midway

Fri 11/6

6:44 pm-11:16 pm

1 stop3h 32m

Washington, D.C. Dulles Intl

Mon 11/9

5:00 pm-10:54 pm

1 stop6h 54m

$236

ChicagoWashington, D.C.

ORD Chicago O'Hare Intl - IAD Washington, D.C. Dulles Intl

ORDIAD

Chicago O'Hare Intl

Fri 11/6

5:27 am-2:09 pm

1 stop7h 42m

Washington, D.C. Dulles Intl

Mon 11/9

8:00 am-2:49 pm

1 stop7h 49m

$236

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/25

Showing 1-10 of 43 resultsSorted by cheapest first

...

Compare providers for flights from Chicago to Dulles Intl

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Chicago to Dulles Intl in August.

Provider	Price Accuracy	Trust Score*
Expedia	Price Accuracy1 star	Trust Score*3 stars
FlightHub	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Chicago-Washington, D.C. Dulles Intl Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Chicago-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Chicago-Washington, D.C. Dulles Intl Airport flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Chicago-Washington, D.C. Dulles Intl Airport flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago-Washington, D.C. Dulles Intl Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Chicago to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Chicago with our price prediction graph.

CHI-IAD

ORD-IAD

MDW-IAD

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 Chicago to Washington, D.C. Dulles Intl Airport

CHI-IAD

ORD-IAD

MDW-IAD

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

Currently, September is the cheapest month in which you can book a flight from Chicago to Washington, D.C. Dulles Intl Airport (average of $302). Flying from Chicago to Washington, D.C. Dulles Intl Airport in August is currently the most expensive (average of $409). 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 CHI to IAD?

A simple way to save on the total cost of your ticket is to fly from Chicago to Washington, D.C. Dulles Intl Airport in the morning. If you’re flexible enough to do this you can expect to save up to 37% on your trip compared to booking a flight at noon.

Weekly flight availability from Chicago to Washington, D.C. Dulles Intl Airport

The most flights from CHI to IAD are scheduled on a Friday (34 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (18 on average).

How much does it cost to fly round-trip from Chicago to Washington, D.C. Dulles Intl Airport?

Airfare is below average for this route at the moment.

Chicago to Washington, D.C. Dulles Intl Airport flights typically cost between $179 and $358 in October.
The cheapest round-trip price found within the last 5 days was $177 on Frontier (Oct 1-Oct 6).

How often are flights from Chicago to Washington, D.C. delayed?

About 18% of weekly flights between Chicago and Washington, D.C. have experienced delays in the past year, with the average delay time being 132 minutes.

What is the most punctual flight time for Chicago to Washington, D.C. flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Monday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Chicago to Washington, D.C. flights?

Over the last year, United Airlines have had the lowest number of delays on this route, with just 17% of flights being delayed.

How far ahead should I book a flight from Chicago to Washington, D.C. Dulles Intl Airport?

The best time to book flights from Chicago to Washington, D.C. Dulles Intl Airport is 41 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest day to fly from Chicago to Washington, D.C. Dulles Intl Airport?

Travelers seeking maximum savings on their Chicago to Washington, D.C. Dulles Intl Airport flight should consider departing on Thursday evenings when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Chicago to Washington, D.C. Dulles Intl Airport flights

Cheapflights partnered with top experts to bring you the best recommendations for your Chicago to Washington, D.C. Dulles Intl Airport trip

Our travel experts

Paul Rubio

Expert on Ethiopian Air

Travel journalist and photographer Paul Rubio is a Miami native (and current resident), who has lived in nine countries and traveled to 137. He is an expert in luxury travel, eco-travel, loyalty programs, hotels, airports and airlines. He is a contributing editor at AFAR, Condé Nast Traveler, LUXURY Magazine, and Palm Beach Illustrated.

Harriet Baskas

Expert on United Airlines

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Ramsey Qubein

Expert on ORD and IAD

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read through reviews of airlines operating flights from Chicago to Washington, D.C. Dulles Intl Airport, such as United Airlines and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

United Airlines

7.4

Good

10,135 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

United Airlines

7.4

Good

10,135 reviews

United Airlines

7.4

Good

10,135 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Frontier

5.6

Fair

2,640 reviews

United Airlines

7.4

Good

10,135 reviews

Reviews

1 / 20

10.0

Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

How long is the flight from Chicago to Washington, D.C. Dulles Intl Airport?
For as low as $177, United Airlines can have you in Washington, D.C. Dulles Intl Airport from Chicago in 2h 06m. The distance between Chicago and Washington, D.C. Dulles Intl Airport is about 587 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from Chicago to Washington, D.C. Dulles Intl Airport round-trip?
Flying on Frontier is currently your cheapest option to Washington, D.C. Dulles Intl Airport, with prices starting at $80. Another option worth looking into is United Airlines, starting at $217 round trip. Frontier is 77% cheaper than the average price of flights available within the next 90 days to this destination.
What are the most reliable airlines from Chicago to Washington, D.C. Dulles Intl Airport?
The top 3 most reliable airlines when flying from Chicago to Washington, D.C. Dulles Intl Airport are Egyptair (96%), Air China (94%) and ITA Airways (92%).
What are the cheapest flights from Chicago to Washington, D.C. Dulles Intl Airport?
Looking at all options, your cheapest flight can be booked for $128. While the most popular route (Chicago O'Hare Intl - Washington, D.C. Dulles Intl) can be booked for $175 on average, our data indicates $1,680 when flying from Chicago to Washington, D.C. Dulles Intl Airport.
Can I find deals for flights from Chicago to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Chicago to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Chicago to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to Dulles Intl.
Can I find deals for business class flights from Chicago to Dulles Intl?
Yes. Cheapflights offers flight deals from Chicago 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 Chicago to Washington, D.C. Dulles Intl Airport?
Currently, September is the cheapest month in which you can book a flight from Chicago to Washington, D.C. Dulles Intl Airport (average of $302). Flying from Chicago to Washington, D.C. Dulles Intl Airport in August is currently the most expensive (average of $409). 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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Top 2 airlines flying from Chicago to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$80	Average$187	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$217	Average$362	FlexibilityNo cancel fee	On-time69%

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$89+ Cheap flights from Chicago (CHI) 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 10/1. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from Chicago to Dulles Intl

Cheapest flights from Chicago to Dulles IntlExplore the most affordable flight options available from Chicago to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 29, 2026.

Explore the most affordable flight options available from Chicago to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 29, 2026.

Best flights from Chicago to Dulles IntlDiscover carefully curated flight deals from Chicago to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 29, 2026.

Discover carefully curated flight deals from Chicago to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 29, 2026.

Last-minute flights from Chicago to Dulles IntlDiscover last-minute flight deals from Chicago to Dulles Intl. Data last updated August 29, 2026 and is based on user searches.

Discover last-minute flight deals from Chicago to Dulles Intl. Data last updated August 29, 2026 and is based on user searches.

One-way flights from Chicago to Dulles IntlSearch for one-way flight options from Chicago to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated August 29, 2026.

Search for one-way flight options from Chicago to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated August 29, 2026.

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Use the filters below to find and compare flights from Chicago to Washington, D.C. Dulles Intl Airport that are best for you.

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Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

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Best time to book a flight from Chicago to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Chicago with our price prediction graph.

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

What is the cheapest time of day to fly from CHI to IAD?

Find hourly flight availability from Chicago 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 August 29, 2026.

A simple way to save on the total cost of your ticket is to fly from Chicago to Washington, D.C. Dulles Intl Airport in the morning. If you’re flexible enough to do this you can expect to save up to 37% on your trip compared to booking a flight at noon.

Weekly flight availability from Chicago to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Chicago to Dulles Intl. 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 August 29, 2026.

The most flights from CHI to IAD are scheduled on a Friday (34 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (18 on average).

How much does it cost to fly round-trip from Chicago to Washington, D.C. Dulles Intl Airport?

Airfare is below average for this route at the moment.

Chicago to Washington, D.C. Dulles Intl Airport flights typically cost between $179 and $358 in October.The cheapest round-trip price found within the last 5 days was $177 on Frontier (Oct 1-Oct 6).

How often are flights from Chicago to Washington, D.C. delayed?

About 18% of weekly flights between Chicago and Washington, D.C. have experienced delays in the past year, with the average delay time being 132 minutes.

What is the most punctual flight time for Chicago to Washington, D.C. flights?

Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Monday tends to have the lowest number of delays on this route, whereas Sunday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on Chicago to Washington, D.C. flights?

Over the last year, United Airlines have had the lowest number of delays on this route, with just 17% of flights being delayed.

How far ahead should I book a flight from Chicago to Washington, D.C. Dulles Intl Airport?

The best time to book flights from Chicago to Washington, D.C. Dulles Intl Airport is 41 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest day to fly from Chicago to Washington, D.C. Dulles Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from Chicago to Dulles Intl. Price data was last updated on August 29, 2026.

Travelers seeking maximum savings on their Chicago to Washington, D.C. Dulles Intl Airport flight should consider departing on Thursday evenings when fares are most often at their lowest. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

The best insider tips for Chicago to Washington, D.C. Dulles Intl Airport flights

AI-powered summary based on content written by travel experts. AI can make mistakes.

Cheapflights partnered with top experts to bring you the best recommendations for your Chicago to Washington, D.C. Dulles Intl Airport trip

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Reviews of airlines servicing Dulles Intl

Read through reviews of airlines operating flights from Chicago to Washington, D.C. Dulles Intl Airport, such as United Airlines and Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

How long is the flight from Chicago to Washington, D.C. Dulles Intl Airport?

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

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Alternative routes for Chicago to Dulles Intl

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Complete your trip

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Other flights to Dulles Intl

Explore flights to Dulles Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 29, 2026.

Cheapest flights from Chicago to Dulles Intl
Explore the most affordable flight options available from Chicago to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 29, 2026.

Best flights from Chicago to Dulles Intl
Discover carefully curated flight deals from Chicago to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 29, 2026.

Last-minute flights from Chicago to Dulles Intl
Discover last-minute flight deals from Chicago to Dulles Intl. Data last updated August 29, 2026 and is based on user searches.

One-way flights from Chicago to Dulles Intl
Search for one-way flight options from Chicago to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated August 29, 2026.

Chicago to Washington, D.C. Dulles Intl Airport flights typically cost between $179 and $358 in October.
The cheapest round-trip price found within the last 5 days was $177 on Frontier (Oct 1-Oct 6).