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Dulles Intl

$117+ Cheap flights from Denver (DEN) to Dulles Intl (IAD)

DEN — IAD
Sep 30 — Oct 71
Wed 9/30
Wed 10/7
1 adult, Economy
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Find cheap flights from Denver to Dulles Intl with Cheapflights

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”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.
Cheapflights Tip: The best prices from Denver Intl to Washington, D.C. Dulles Intl are usually found in February or October, booked 81 days in advance, depart on a Thursday or Friday and return on a Wednesday

Cheap flight deals from Denver to Dulles Intl

Cheapest flights from Denver to Dulles Intl

Sat 9/2610:38 am -
2 stops17h 42m
Sat 10/37:50 am -
1 stop15h 34m
Deal found 8/26$226
Mon 10/128:45 pm -
1 stop7h 35m
Tue 10/139:06 pm -
1 stop13h 00m
Deal found 8/26$228
Wed 10/146:57 pm -
1 stop20h 16m
Fri 10/166:00 am -
1 stop8h 18m
Deal found 8/26$229
Thu 9/246:38 pm -
1 stop9h 42m
Wed 9/307:50 am -
2 stops15h 49m
Deal found 8/26$231
Tue 10/136:57 pm -
1 stop20h 16m
Thu 10/1512:30 pm -
1 stop11h 19m
Deal found 8/26$233
Mon 9/217:12 pm -
1 stop13h 05m
Mon 9/289:04 pm -
1 stop13h 00m
Deal found 8/27$235
Thu 9/179:19 pm -
1 stop12h 14m
Wed 9/237:50 am -
2 stops15h 49m
Deal found 8/27$236
Sat 10/176:42 pm -
1 stop9h 38m
Mon 10/199:06 pm -
1 stop13h 00m
Deal found 8/29$237
Fri 10/910:45 pm -
1 stop29h 35m
Mon 10/129:06 pm -
1 stop13h 00m
Deal found 8/27$238

Find flight deals from Denver to Dulles Intl

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$226
(Kiwi.com)

One-way from

$117
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$490

Good round-trip deal

$429 or less

Good one-way deal

$305 or less
Provider with most accurate pricing for Denver Intl-Washington, D.C. Dulles Intl flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Washington, D.C. Dulles Intl flights.
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From Denver Intl to Washington, D.C. Dulles Intl
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One-way flight from Denver Intl to Washington, D.C. Dulles Intl
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Highest demand for flights based on searches. 19% potential increase in price ($98 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
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Average for round-trip flights in August 2026
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Price to beat on a round-trip flight from Denver Intl to Washington, D.C. Dulles Intl.
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Price to beat on a one-way flight from Denver Intl to Washington, D.C. Dulles Intl.
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Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Wed 9/23

11:59 pm-5:25 am

Nonstop3h 26m

Washington, D.C. Dulles Intl

Sun 9/27

8:15 am-10:09 am

Nonstop3h 54m

$369

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Thu 10/15

6:00 am-11:25 am

Nonstop3h 25m

Washington, D.C. Dulles Intl

Mon 10/19

10:34 pm-12:30 am

Nonstop3h 56m

$429

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Wed 10/21

11:52 pm-5:17 am

Nonstop3h 25m

Washington, D.C. Dulles Intl

Sun 10/25

10:10 pm-12:19 am

Nonstop4h 09m

$429

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Thu 10/22

6:00 am-11:25 am

Nonstop3h 25m

Washington, D.C. Dulles Intl

Mon 10/26

10:10 pm-12:19 am

Nonstop4h 09m

$429

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Thu 10/29

12:35 pm-5:55 pm

Nonstop3h 20m

Washington, D.C. Dulles Intl

Sun 11/1

10:00 am-12:09 pm

Nonstop4h 09m

$429

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Fri 10/30

2:10 pm-7:30 pm

Nonstop3h 20m

Washington, D.C. Dulles Intl

Sun 11/1

10:00 am-12:09 pm

Nonstop4h 09m

$429

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Fri 10/30

3:30 pm-5:40 am

1 stop12h 10m

Washington, D.C. Dulles Intl

Sun 11/1

7:05 am-10:50 pm

2 stops17h 45m

$476

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Thu 9/3

2:54 pm-12:34 am

1 stop7h 40m

Washington, D.C. Dulles Intl

Mon 9/7

6:00 am-9:59 am

1 stop5h 59m

$489

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Thu 10/1

3:04 pm-5:40 am

1 stop12h 36m

Washington, D.C. Dulles Intl

Mon 10/5

7:02 am-11:59 pm

2 stops18h 57m

$551

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Sun 10/25

11:59 pm-5:19 am

Nonstop3h 20m

Washington, D.C. Dulles Intl

Fri 10/30

5:55 pm-6:57 am

1 stop15h 02m

$571

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/31

Showing 1-10 of 21 resultsSorted by cheapest first
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Compare providers for flights from Denver to Dulles Intl

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Denver to Dulles Intl in August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*1 star
Super.comPrice 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 Denver-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 Denver-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Denver-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 Denver-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 Denver-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 Denver to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Denver with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from Denver to Washington, D.C. Dulles Intl Airport

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

The price you pay for your flight from Denver to Washington, D.C. Dulles Intl Airport may vary depending on when you book. For the best chance of a lower fare, look to book 80 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, February is the cheapest month in which you can book a flight from Denver to Washington, D.C. Dulles Intl Airport (average of $322). Flying from Denver to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $557). 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 DEN to IAD?

It’s optimal to fly from Denver to Washington, D.C. Dulles Intl Airport in the morning. By choosing this option you can save up to 28% on the cost of your flight, compared to a flight in the evening.

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

Travelers seeking maximum savings on their Denver to Washington, D.C. Dulles Intl Airport flight should consider departing on Thursday afternoons 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.

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

Airfare is below average for this route at the moment.

Denver to Washington, D.C. Dulles Intl Airport flights typically cost between $309 and $542 in September.
The cheapest round-trip price found within the last 5 days was $226 on Frontier (Sep 26-Oct 3).

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

Cheapflights partnered with top experts to bring you the best recommendations for your Denver to Washington, D.C. Dulles Intl Airport trip
Our travel experts
Emily Zemler

Emily Zemler

Expert on DEN

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on 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 more

Reviews of airlines servicing Dulles Intl

Read reviews from past customers who have flown Southwest,United Airlines, andFrontier from Denver to Washington, D.C. Dulles Intl Airport. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,199 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
Southwest
8.0
Very good
4,199 reviews
Southwest
8.0
Very good
4,199 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
United Airlines
7.4
Good
10,148 reviews
Southwest
8.0
Very good
4,199 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.
Frontier
5.6
Fair
2,635 reviews
Southwest
8.0
Very good
4,199 reviews

Comfort

8.0

Entertainment

7.5

Food

7.0

Boarding

8.1

Crew

8.6

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Feb 2026

DEN - BDL

Weird they cancelled a direct and rerouted me on a connecting flight to get in 10 hours later. What was the point? Crew and flight were great, but not sure what's going on with Southwest.

Related info for your journey

  • What airport do you fly from for flights from Denver to Washington, D.C. Dulles Intl?

    Most people fly from Denver Intl (DEN) if they book a flight from Denver to Washington, D.C. Dulles Intl. On average, Denver Intl has 19 outbound flights to Washington, D.C. Dulles Intl per day from 3 airlines. Denver Intl is conveniently located just 18.5 mi from Denver’s city center.

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

    United Airlines can get you from Denver to Washington, D.C. Dulles Intl Airport in just under 3h 26m. Your travel time will be generally consistent. Airlines will cover a distance of 1448 mi. All flights are typically nonstop.

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

    Our cheapest airline available from Denver to Washington, D.C. Dulles Intl Airport is Frontier. Our recent data shows that you can find tickets from as low as $137 on this airline. Additional options worth looking into are Southwest and United Airlines, starting at $188 and $218 round-trip. Users have found that Frontier is 67% cheaper than the other options available to this destination.

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

    To fly one-way, consider booking your trip with Frontier, which is currently one of the cheapest options available, starting at $76. Southwest flights start at $88 while deals on United Airlines start at $128 one-way.

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

    No one likes to see their flight delayed. When booking a flight from Denver to Washington, D.C. Dulles Intl Airport consider choosing Avianca (93%), ITA Airways (92%) or Brussels Airlines (84%) as they are the most reliable in getting you off to your destination on time.

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

    While on average a flight from Denver to Washington, D.C. Dulles Intl Airport is generally $1,182, our data shows the cheapest flight currently is $193. When looking at the most popular route, (Denver Intl - Washington, D.C. Dulles Intl), you can expect to pay $249 for that flight.

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

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

  • How can I find direct flights from Denver to Dulles Intl?

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

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

    Yes. Cheapflights offers flight deals from Denver 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 Denver to Washington, D.C. Dulles Intl Airport?

    Currently, February is the cheapest month in which you can book a flight from Denver to Washington, D.C. Dulles Intl Airport (average of $322). Flying from Denver to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $557). 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 Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Alexandria
Owings Mills
Arlington
Tysons
Lanham
Reston
Herndon
Rockville
Chantilly
Hyattsville
Fredericksburg
Woodbridge
Falls Church
Sterling
Hanover
Laurel
Oxon Hill
Clinton
Hunt Valley
Silver Spring

Browse thousands of different options on Cheapflights for your next trip

Top 3 airlines flying from Denver to Dulles Intl

AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$137Average$301FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$188Average$352FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$218Average$474FlexibilityNo cancel feeOn-time69%

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