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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 3/26. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — IAD
févr. 25 — mars 41
mar. 2/25
mar. 3/4
1 adult, Economy
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The best prices from Chicago to Washington, D.C. Dulles Intl are usually found in August or April, 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 février 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$175
(Frontier)

One-way from

$89
(United Airlines)

Popular in

December

Cheapest in

August

Average price

$369

Good round-trip deal

$429 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. 3% potential increase in price ($10 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in February 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 février 20, 2025.

This Frontier deal was found by Cheapflights users on 2/19. 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.
mar. 4/1511:00 amMDW - IAD
1 stop7h 44mFrontier
lun. 4/2112:58 pmIAD - MDW
1 stop7h 48mFrontier
Deal found 2/19$175
This Mytrip deal was found by Cheapflights users on 2/19. 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.
ven. 4/49:54 amORD - IAD
1 stop6h 11mFrontier
dim. 4/611:45 amIAD - ORD
1 stop21h 05mFrontier
Deal found 2/19$177
This United Airlines deal was found by Cheapflights users on 2/20. 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.
lun. 3/249:07 pmORD - IAD
Nonstop1h 52mUnited Airlines
mer. 3/268:20 amIAD - ORD
Nonstop2h 18mUnited Airlines
Deal found 2/20$178
This KAYAK deal was found by Cheapflights users on 2/20. 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. 3/255:30 pmORD - IAD
1 stop6h 01mDelta
mer. 3/267:35 amIAD - ORD
1 stop7h 10mDelta
Deal found 2/20$194
This Delta deal was found by Cheapflights users on 2/20. 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.
jeu. 3/66:00 amMDW - IAD
1 stop4h 57mDelta
lun. 3/106:00 amIAD - MDW
1 stop3h 45mDelta
Deal found 2/20$197
This American Airlines deal was found by Cheapflights users on 2/19. 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.
jeu. 3/65:00 amORD - IAD
1 stop7h 31mAmerican Airlines
lun. 3/101:52 pmIAD - ORD
1 stop6h 39mAmerican Airlines
Deal found 2/19$267
This Mytrip deal was found by Cheapflights users on 2/20. 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.
mer. 3/125:22 pmORD - IAD
3 stops17h 04mMultiple Airlines
ven. 3/145:40 pmIAD - ORD
3 stops31h 16mMultiple Airlines
Deal found 2/20$280

Find flights from Chicago to Dulles Intl within your budget

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 février 20, 2025.

Fly from

Chicago

Fly to

Dulles Intl

Route

Depart

Return

Price

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

mar. 4/15

11:00 am-7:44 pm

1 stop7h 44m

Washington, D.C. Dulles Intl

lun. 4/21

12:58 pm-7:46 pm

1 stop7h 48m

$175

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

ven. 4/4

9:54 am-5:05 pm

1 stop6h 11m

Washington, D.C. Dulles Intl

dim. 4/6

11:45 am-7:50 am

1 stop21h 05m

$177

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

lun. 3/24

9:07 pm-11:59 pm

Nonstop1h 52m

Washington, D.C. Dulles Intl

mer. 3/26

8:20 am-9:38 am

Nonstop2h 18m

$178

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

mar. 3/25

5:30 pm-12:31 am

1 stop6h 01m

Washington, D.C. Dulles Intl

mer. 3/26

7:35 am-1:45 pm

1 stop7h 10m

$194

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

jeu. 3/6

6:28 pm-11:13 pm

1 stop3h 45m

Washington, D.C. Dulles Intl

jeu. 3/13

6:00 am-8:45 am

1 stop3h 45m

$197

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

jeu. 3/6

5:00 am-1:31 pm

1 stop7h 31m

Washington, D.C. Dulles Intl

lun. 3/10

1:52 pm-7:31 pm

1 stop6h 39m

$267

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

mer. 3/12

5:22 pm-11:26 am

3 stops17h 04m

Washington, D.C. Dulles Intl

ven. 3/14

5:40 pm-11:56 pm

3 stops31h 16m

$280

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

mer. 3/26

6:18 pm-9:13 pm

Nonstop1h 55m

$89

ChicagoWashington, D.C.

MDW - IAD

MDWIAD

Chicago Midway

mer. 5/28

9:12 pm-4:23 pm

1 stop18h 11m

$90

ChicagoWashington, D.C.

ORD - IAD

ORDIAD

Chicago O'Hare Intl

dim. 3/9

8:10 am-9:25 pm

1 stop12h 15m

$91

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 17 results
1
2

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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust 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.
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.

Travel insights for flights from Chicago to Dulles Intl

Get recent, data-driven insights about flights from Chicago to Dulles Intl including ideal travel times, pricing trends, and more.

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 February 14, 2025.

The best time to book flights from Chicago to Washington, D.C. Dulles Intl Airport is 69 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 $389). 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 février 20, 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 59% 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 March 10, 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 février 20, 2025.

The most flights from CHI to IAD are scheduled on a Thursday (20 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (8 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 février 20, 2025.
Read reviews from past customers who have flown Delta, United Airlines and Allegiant Air 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
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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
8,220 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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
8,766 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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
765 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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

Sun Country Air
7.0
Good
374 reviews
Delta
8.0
Very good
8,220 reviews

Comfort

8.0

Food

7.3

Entertainment

7.9

Overall

8.0

Crew

8.5

Boarding

8.2

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 Frontier is currently your cheapest option to Washington, D.C. Dulles Intl Airport, with prices starting at $175. Additional round-trip tickets that might be worth considering are offered by United Airlines and Delta, with the lowest prices starting at $178 and $194, respectively. Frontier is 44% 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 United Airlines. You may also be able to find cheap deals on Frontier and Allegiant Air, with prices starting from $90 and $95, 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 (94%), Avianca (92%) and Austrian Airlines (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 $141 on average our data indicates $843 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 $389). 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 février 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$54Average$164FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$109Average$332FlexibilityNo cancel feeOn-time71%
DeltaCheapest$176Average$342FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$177Average$306FlexibilityNo cancel feeOn-time69%
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