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 $212 and $388 in September. The cheapest round-trip price found within the last 3 days was $142 on Frontier (Sep 11-Sep 15).

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

For as low as $142, Frontier can have you in Washington, D.C. Dulles Intl Airport from Chicago in 5h 35m. The distance between Chicago and Washington, D.C. Dulles Intl Airport is about 576 mi.

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 $122. Additional round-trip tickets that might be worth considering are offered by Delta and United Airlines, with the lowest prices starting at $176 and $186, respectively. Frontier is 59% cheaper than the average price of flights available within the next 90 days to this destination.

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 45 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, July is the cheapest month in which you can book a flight from Chicago to Washington, D.C. Dulles Intl Airport (average of $303). Flying from Chicago to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 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. 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

The most flights from CHI to IAD are scheduled on a Tuesday (29 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 on average).

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 $149. While the most popular route (Chicago O'Hare Intl - Washington, D.C. Dulles Intl) can be booked for $143 on average our data indicates $1,670 when flying from Chicago to Washington, D.C. Dulles Intl Airport.

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 Avianca (80%), Air China (78%) and Austrian Airlines (77%).

What are the most popular airlines that fly from Chicago to Washington, D.C. Dulles Intl Airport?

Delta, Frontier and United Airlines are the most popular airlines when flying from Chicago to Washington, D.C. Dulles Intl Airport.

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

Thursday is generally a great day to depart. Flying on this day could help you save up to 42%.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 42 days in advance, which can save you up to 82% on flights from Chicago to Washington, D.C. Dulles Intl Airport compared to booking the week you need them. Waiting 42 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $176. For sooner than that we have options available in the next 3 days from $364.

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

Flights from Chicago to Washington, D.C. Dulles Intl Airport lean towards being more expensive in January. Prices are generally better when you fly from Chicago to Washington, D.C. Dulles Intl Airport in August, with the cheapest ticket starting at $93.

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 53% on your trip compared to booking a flight at noon.

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.

$79+ Flights from Chicago to Washington, D.C. Dulles Intl Airport

Round-trip from	$142 (Gotogate)
One-way from	$79 (FlightHub)
Popular in	December
Cheapest in	August
Average price	$235
Good round-trip deal	$284 or less
Good one-way deal	$265 or less

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.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$122	Average$225	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$176	Average$340	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$186	Average$305	FlexibilityNo cancel fee	On-time69%

$79+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Chicago to Dulles Intl with Cheapflights

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Cheapflights Tip: The best prices from Chicago to Washington, D.C. Dulles Intl are usually found in August or April, booked 45 days in advance, depart on a Friday or Wednesday and return on a Friday

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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 agosto 20, 2025.

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 agosto 20, 2025.

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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

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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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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 August 8, 2025.

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 agosto 20, 2025.

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.

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 agosto 20, 2025.

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

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

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.

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

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

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

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

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

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

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

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

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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 agosto 20, 2025.