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Dulles Intl

$87+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — IAD
May 4 — May 111
Sun 5/4
Sun 5/11
1 adult, Economy
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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”

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3. Compare prices and book

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Cheapflights Tip: The best prices from Chicago to Washington, D.C. Dulles Intl are usually found in August or July, booked 69 days in advance, depart on a Friday or Thursday and return on a Friday

Cheap flight deals from Chicago to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to Dulles Intl (IAD). 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 April 29, 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

December

Cheapest in

August

Average price

$308

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. Dulles Intl flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-Washington, D.C. Dulles Intl flights.
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From Chicago (CHI) to Washington, D.C. Dulles Intl
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One-way flight from Chicago (CHI) to Washington, D.C. Dulles Intl
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Highest demand for flights based on searches. 6% potential increase in price ($19 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($7 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 Chicago (CHI) to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from Chicago (CHI) to Washington, D.C. Dulles Intl.
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Find flight deals from Chicago to Dulles Intl

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 April 29, 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.
Mon 5/128:30 amMDW - IAD
1 stop4h 53mFrontier
Thu 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.
Thu 5/156:00 amORD - IAD
1 stop7h 23mFrontier
Mon 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.
Sat 5/249:31 pmORD - IAD
Nonstop1h 59mUnited Airlines
Mon 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.
Sat 5/244:15 pmMDW - IAD
1 stop6h 20mDelta
Sun 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.
Sat 5/244:25 pmORD - IAD
1 stop6h 10mDelta
Sun 5/256:00 amIAD - ORD
1 stop5h 03mDelta
Deal found 4/29$197
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.
Wed 6/255:38 pmORD - IAD
1 stop5h 26mMultiple Airlines
Mon 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.
Sat 6/219:22 amORD - IAD
1 stop6h 49mAmerican Airlines
Wed 6/258:14 pmIAD - ORD
1 stop4h 43mAmerican 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.
Fri 6/138:36 pmMDW - IAD
2 stops23h 17mAllegiant Air
Sun 6/153:58 pmIAD - MDW
1 stop16h 17mAllegiant Air
Deal found 4/29$256
This Sun Country Air 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/298:05 pmORD - IAD
1 stop14h 48mSun Country Air
Thu 7/176:05 amIAD - ORD
1 stop12h 10mSun Country Air
Deal found 4/29$315
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.
Mon 5/199:42 amMDW - IAD
3 stops24h 44mMultiple Airlines
Thu 5/228:22 pmIAD - MDW
1 stop17h 03mMultiple Airlines
Deal found 4/29$357
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/38:00 amORD - IAD
1 stop14h 59mAlaska Airlines
Wed 6/46:15 pmIAD - ORD
1 stop12h 25mAlaska Airlines
Deal found 4/29$394

Cheapflights Fare Finder

Customize your flight search to find flights from Chicago 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 April 29, 2025.
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

Chicago

Fly to

Dulles Intl

Route

Depart

Return

Price

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Mon 5/12

8:30 am-2:23 pm

1 stop4h 53m

Washington, D.C. Dulles Intl

Thu 5/15

3:32 pm-11:39 pm

1 stop9h 07m

$180

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Thu 5/15

6:00 am-2:23 pm

1 stop7h 23m

Washington, D.C. Dulles Intl

Mon 5/19

3:32 pm-11:11 pm

1 stop8h 39m

$180

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Sat 5/24

9:31 pm-12:30 am

Nonstop1h 59m

Washington, D.C. Dulles Intl

Mon 5/26

6:48 am-8:02 am

Nonstop2h 14m

$195

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Sat 5/24

4:15 pm-11:35 pm

1 stop6h 20m

Washington, D.C. Dulles Intl

Sun 5/25

6:00 am-11:53 am

1 stop6h 53m

$197

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Sat 5/24

5:15 pm-10:54 pm

1 stop4h 39m

Washington, D.C. Dulles Intl

Sun 5/25

6:00 am-9:18 am

1 stop4h 18m

$197

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Wed 6/25

5:38 pm-12:04 am

1 stop5h 26m

Washington, D.C. Dulles Intl

Mon 6/30

12:28 pm-5:15 pm

1 stop5h 47m

$239

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Sat 6/21

9:22 am-5:11 pm

1 stop6h 49m

Washington, D.C. Dulles Intl

Wed 6/25

8:14 pm-11:57 pm

1 stop4h 43m

$251

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Fri 6/13

8:36 pm-8:53 pm

2 stops23h 17m

Washington, D.C. Dulles Intl

Sun 6/15

3:58 pm-7:15 am

1 stop16h 17m

$256

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

Thu 6/12

8:10 pm-12:25 pm

1 stop15h 15m

Washington, D.C. Dulles Intl

Sun 6/15

7:45 am-7:11 pm

1 stop12h 26m

$295

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

Mon 5/19

9:42 am-11:26 am

3 stops24h 44m

Washington, D.C. Dulles Intl

Thu 5/22

8:22 pm-12:25 pm

1 stop17h 03m

$357

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/29

Showing 1-10 of 22 results
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Compare providers for flights from Chicago to Dulles Intl

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.
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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-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 eDreams the most. eDreams 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.

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

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Chicago to Washington, D.C. Dulles Intl Airport trip
Airlines
Ethiopian Air

Economy Class offers a 32-inch pitch and 17-inch width, with personal entertainment monitors on most aircraft.


Cloud 9 passengers enjoy real Champagne and Ethiopian dishes like doro wot on long-haul flights.

Read more about Ethiopian Airby Paul Rubio
United Airlines

Basic Economy allows a personal item only; no carry-on bags unless you're a MileagePlus member.


Economy Plus offers extra legroom seats at the front of the economy cabin for MileagePlus Premier members.

Read more about United Airlinesby Harriet Baskas
Airports
ORD

For a quick departure, use the free shuttle train between terminals at ORD to avoid long walks.

Read more about ORDby Ramsey Qubein
IAD

Use the Washington Metro Silver line for a cost-effective trip to downtown D.C. from IAD, taking less than 40 minutes.

Read more about IADby Ramsey Qubein
Our travel experts
Paul Rubio

Paul Rubio

Expert on Ethiopian Air

Paul Rubio

Paul Rubio

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.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet Baskas

Harriet Baskas

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.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on ORD and IAD

Ramsey Qubein

Ramsey Qubein

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 more

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.
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

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

Use this chart to determine the optimal time to book a round-trip flight from Chicago to Dulles Intl. Price data was last updated on April 25, 2025.

The best time to book flights from Chicago to Washington, D.C. Dulles Intl Airport is 27 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 month to book a flight from Chicago to Washington, D.C. Dulles Intl Airport?

Currently, August is the cheapest month in which you can book a flight from Chicago to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Chicago 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 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 April 29, 2025.

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 60% on your trip compared to booking a flight at noon.

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 December 16, 2024.

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. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 April 29, 2025.
Read reviews from past customers who have flown Delta, Avelo Airlines and United Airlines from Chicago to Washington, D.C.. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,936 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
7,936 reviews
Delta
8.0
Very good
7,936 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
7,936 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
7,936 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
7,936 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
7,936 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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 Chicago 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 flying from Chicago to Washington, D.C. Dulles Intl Airport round-trip?

    Flying on United Airlines is currently your cheapest option to Washington, D.C. Dulles Intl Airport, with prices starting at $179. Additional round-trip tickets that might be worth considering are offered by Frontier and Delta, with the lowest prices starting at $180 and $197, respectively. United Airlines is 41% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from Chicago to Washington, D.C. Dulles Intl Airport one-way?

    $87 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and Delta, with prices starting from $90 and $99, respectively.

  • 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 Air China (89%), Ethiopian Air (86%) and Austrian Airlines (84%).

  • 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 $114. While the most popular route (Chicago O'Hare Intl - Washington, D.C. Dulles Intl) can be booked for $179 on average our data indicates $1,008 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, August is the cheapest month in which you can book a flight from Chicago to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Chicago 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 Chicago?

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Alternative routes for Chicago to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Top 4 airlines flying from Chicago to Dulles Intl

Discover the top 4 airlines that operate flights from Chicago 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 April 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$191FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$109Average$332FlexibilityNo cancel feeOn-time71%
DeltaCheapest$176Average$340FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$180Average$305FlexibilityNo cancel feeOn-time69%

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