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Dulles Intl

$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 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — IAD
jun. 17 — jun. 241
mar. 6/17
mar. 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Chicago to Washington, D.C. Dulles Intl are usually found in August or May, booked 23 days in advance, depart on a Friday or Wednesday 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 junio 12, 2025.

Round-trip from

$157
(United Airlines)

One-way from

$89
(Frontier)

Popular in

December

Cheapest in

August

Average price

$333

Good round-trip deal

$441 or less

Good one-way deal

$149 or less
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. 8% potential increase in price ($27 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in June 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 junio 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/11. 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. 8/149:31 pmORD - IAD
Nonstop1h 59mUnited Airlines
lun. 8/1810:19 pmIAD - ORD
Nonstop2h 11mUnited Airlines
Deal found 6/11$157
This CheapOair deal was found by Cheapflights users on 6/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 9/205:45 pmORD - IAD
1 stop5h 10mFrontier
jue. 9/258:06 pmIAD - ORD
1 stop17h 51mFrontier
Deal found 6/10$171
This Mytrip deal was found by Cheapflights users on 6/10. 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.
vie. 8/225:50 pmORD - IAD
1 stop18h 14mMultiple Airlines
dom. 8/244:56 pmIAD - ORD
1 stop24h 52mMultiple Airlines
Deal found 6/10$178
This Delta deal was found by Cheapflights users on 6/10. 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.
mar. 8/56:20 pmMDW - IAD
1 stop3h 35mDelta
mié. 8/139:50 amIAD - MDW
1 stop3h 38mDelta
Deal found 6/10$197
This Delta deal was found by Cheapflights users on 6/10. 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.
mié. 9/246:00 amORD - IAD
1 stop4h 57mDelta
mar. 9/306:00 amIAD - ORD
1 stop5h 03mDelta
Deal found 6/10$197
This Mytrip deal was found by Cheapflights users on 6/11. 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. 7/119:12 amMDW - IAD
1 stop27h 43mAllegiant Air
dom. 7/203:53 pmIAD - MDW
1 stop16h 20mAllegiant Air
Deal found 6/11$204
This KAYAK deal was found by Cheapflights users on 6/12. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 7/196:20 amMDW - IAD
1 stop7h 56mFrontier
mié. 7/236:10 amIAD - MDW
1 stop5h 30mFrontier
Deal found 6/12$211
This Sun Country Air deal was found by Cheapflights users on 6/10. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/811:50 amORD - IAD
1 stop22h 53mSun Country Air
sáb. 7/1212:40 pmIAD - ORD
1 stop5h 29mSun Country Air
Deal found 6/10$245
This American Airlines deal was found by Cheapflights users on 6/11. 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.
mié. 8/67:35 amORD - IAD
1 stop6h 44mAmerican Airlines
sáb. 8/99:14 amIAD - ORD
1 stop5h 55mAmerican Airlines
Deal found 6/11$251
This eDestinos deal was found by Cheapflights users on 6/10. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 6/2511:39 amMDW - IAD
1 stop11h 25mMultiple Airlines
dom. 6/293:58 pmIAD - MDW
1 stop16h 17mMultiple Airlines
Deal found 6/10$272
This KAYAK deal was found by Cheapflights users on 6/11. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 7/157:45 amMDW - IAD
2 stops9h 40mSouthwest
sáb. 7/196:30 amIAD - MDW
2 stops9h 35mSouthwest
Deal found 6/11$370

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 junio 12, 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.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

jue. 8/14

9:31 pm-12:30 am

Nonstop1h 59m

Washington, D.C. Dulles Intl

lun. 8/18

10:19 pm-11:30 pm

Nonstop2h 11m

$157

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

vie. 8/22

5:50 pm-1:04 pm

1 stop18h 14m

Washington, D.C. Dulles Intl

dom. 8/24

4:56 pm-4:48 pm

1 stop24h 52m

$178

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

mar. 8/5

6:20 pm-10:55 pm

1 stop3h 35m

Washington, D.C. Dulles Intl

mié. 8/13

9:50 am-12:28 pm

1 stop3h 38m

$197

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

mié. 8/6

7:10 am-11:32 am

1 stop3h 22m

Washington, D.C. Dulles Intl

mar. 8/12

7:22 am-12:16 pm

1 stop5h 54m

$197

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

vie. 7/11

9:12 am-1:55 pm

1 stop27h 43m

Washington, D.C. Dulles Intl

dom. 7/20

3:53 pm-7:13 am

1 stop16h 20m

$204

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

sáb. 7/19

6:20 am-3:16 pm

1 stop7h 56m

Washington, D.C. Dulles Intl

mié. 7/23

6:10 am-10:40 am

1 stop5h 30m

$211

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

mar. 7/8

11:50 am-11:43 am

1 stop22h 53m

Washington, D.C. Dulles Intl

sáb. 7/12

12:40 pm-5:09 pm

1 stop5h 29m

$245

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

mar. 7/8

5:38 pm-12:12 am

1 stop5h 34m

Washington, D.C. Dulles Intl

mar. 7/15

6:10 am-10:25 am

1 stop5h 15m

$247

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

mié. 8/6

7:35 am-3:19 pm

1 stop6h 44m

Washington, D.C. Dulles Intl

sáb. 8/9

9:14 am-2:09 pm

1 stop5h 55m

$251

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

mié. 6/25

11:39 am-12:04 am

1 stop11h 25m

Washington, D.C. Dulles Intl

dom. 6/29

3:58 pm-7:15 am

1 stop16h 17m

$272

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

Showing 1-10 of 21 results
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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, especially during busy weekday mornings.

Read more about ORDby Ramsey Qubein
IAD

Take the Washington Metro Silver line from IAD to the city in under 40 minutes, a cost-effective option for arrivals.

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 June 9, 2025.

The best time to book flights from Chicago to Washington, D.C. Dulles Intl Airport is 23 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 July is currently the most expensive (average of $349). 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 junio 12, 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 57% 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.

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 junio 12, 2025.

The most flights from CHI to IAD are scheduled on a Tuesday (29 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (20 on average).

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 junio 12, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Chicago to Washington, D.C.. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Allegiant Air
7.3
Good
725 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Overall

8.0

Food

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 $157. Additional round-trip tickets that might be worth considering are offered by Delta and Allegiant Air, with the lowest prices starting at $197 and $204, respectively. United Airlines is 48% 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?

    $89 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 Allegiant Air, with prices starting from $90 and $96, 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 Austrian Airlines (95%), Air China (94%) and Avianca (89%).

  • 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 $145 on average our data indicates $2,079 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 July is currently the most expensive (average of $349). 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 3 airlines flying from Chicago to Dulles Intl

Discover the top 3 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 junio 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$191FlexibilityNo cancel feeOn-time62%
DeltaCheapest$176Average$340FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$179Average$300FlexibilityNo cancel feeOn-time69%

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