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Dulles Intl

$148+ Cheap flights from Denver (DEN) to Dulles Intl (IAD)

DEN — IAD
Nov 29 — Dec 61
Sun 11/29
Sun 12/6
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

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Cheapflights Tip: The best prices from Denver Intl to Washington, D.C. Dulles Intl are usually found in February or January, booked 76 days in advance, depart on a Friday or Thursday and return on a Wednesday

Cheap flight deals from Denver to Dulles Intl

Cheapest flights from Denver to Dulles Intl

Wed 11/256:58 pm -
1 stop16h 27m
Fri 11/271:09 pm -
1 stop13h 45m
Deal found 10/25$293
Thu 12/38:46 pm -
2 stops16h 03m
Mon 12/78:55 pm -
1 stop13h 55m
Deal found 10/25$294
Sat 11/217:50 pm -
1 stop7h 20m
Fri 11/271:09 pm -
1 stop13h 45m
Deal found 10/25$295
Wed 11/1810:39 am -
2 stops11h 04m
Fri 11/2010:47 pm -
2 stops22h 25m
Deal found 10/26$296
Sat 11/217:50 pm -
2 stops14h 24m
Mon 11/2310:47 pm -
1 stop9h 49m
Deal found 10/29$297
Wed 11/117:10 pm -
1 stop13h 11m
Sat 11/1411:16 am -
1 stop10h 44m
Deal found 10/29$298
Fri 11/204:17 pm -
2 stops17h 57m
Thu 11/2610:47 pm -
1 stop9h 49m
Deal found 10/27$299
Wed 11/49:20 pm -
1 stop12h 16m
Sat 11/1412:33 pm -
1 stop11h 01m
Deal found 10/28$300
Mon 11/2311:59 pm -
2 stops10h 15m
Mon 11/3010:47 pm -
2 stops18h 58m
Deal found 10/27$301
Wed 11/189:10 pm -
1 stop12h 36m
Fri 11/209:35 pm -
1 stop14h 38m
Deal found 10/28$302
Sun 12/206:25 am -
1 stop11h 06m
Sun 1/310:59 pm -
1 stop9h 30m
Deal found 10/28$304

Find flight deals from Denver to Dulles Intl

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$293
(Cheapflightsfares)

One-way from

$148
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$497

Good round-trip deal

$537 or less

Good one-way deal

$332 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. 13% potential increase in price ($70 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).
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Average for round-trip flights in October 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

DenverWashington, D.C.

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

DENIAD

Denver Intl

Tue 11/10

12:12 pm-5:44 am

1 stop15h 32m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$235

DenverWashington, D.C.

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

DENIAD

Denver Intl

Wed 11/25

7:24 am-5:36 pm

1 stop8h 12m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$252

DenverWashington, D.C.

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

DENIAD

Denver Intl

Wed 11/11

3:08 pm-11:30 pm

1 stop6h 22m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$259

DenverWashington, D.C.

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

DENIAD

Denver Intl

Sat 3/13

11:50 pm-5:08 am

Nonstop3h 18m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$279

DenverWashington, D.C.

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

DENIAD

Denver Intl

Thu 1/7

4:07 pm-9:28 pm

Nonstop3h 21m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$279

DenverWashington, D.C.

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

DENIAD

Denver Intl

Fri 3/19

12:35 pm-5:57 pm

Nonstop3h 22m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$319

DenverWashington, D.C.

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

DENIAD

Denver Intl

Mon 1/25

11:45 am-5:10 pm

Nonstop3h 25m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$319

DenverWashington, D.C.

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

DENIAD

Denver Intl

Mon 12/21

6:00 am-11:21 am

Nonstop3h 21m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$319

DenverWashington, D.C.

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

DENIAD

Denver Intl

Sat 12/19

12:50 pm-6:11 pm

Nonstop3h 21m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$319
Quickest round-trip

DenverWashington, D.C.

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

DENIAD

Denver Intl

Mon 12/14

7:40 am-12:57 pm

Nonstop3h 17m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$319

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/26

Showing 1-10 of 24 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 October.
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
JustAirTicketPrice Accuracy-Trust Score*1 star

*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 75 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 $336). 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 29% 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 at noon 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 $397 and $563 in November.
The cheapest round-trip price found within the last 5 days was $293 on Frontier (Nov 25-Nov 27).

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
7.9
Good
4,218 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.4

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Courtney,Sep 2026

DEN - STL

I still think the aircraft should load from the back and window seats first for all passengers. It's so much easier and efficient to board when you do not have to worry about hitting Anyone already seated.
Southwest
7.9
Good
4,218 reviews
Southwest
7.9
Good
4,218 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.4

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Courtney,Sep 2026

DEN - STL

I still think the aircraft should load from the back and window seats first for all passengers. It's so much easier and efficient to board when you do not have to worry about hitting Anyone already seated.
United Airlines
7.3
Good
10,448 reviews
Southwest
7.9
Good
4,218 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.4

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Courtney,Sep 2026

DEN - STL

I still think the aircraft should load from the back and window seats first for all passengers. It's so much easier and efficient to board when you do not have to worry about hitting Anyone already seated.
Frontier
5.5
Fair
2,515 reviews
Southwest
7.9
Good
4,218 reviews

Comfort

8.0

Boarding

8.1

Crew

8.6

Food

7.0

Entertainment

7.4

Overall

7.9

Reviews

1 / 20
10.0
Excellent

Courtney,Sep 2026

DEN - STL

I still think the aircraft should load from the back and window seats first for all passengers. It's so much easier and efficient to board when you do not have to worry about hitting Anyone already seated.

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 7 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 13m. 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 $145 on this airline. Additional options worth looking into are Southwest and United Airlines, starting at $216 and $269 round-trip. Users have found that Frontier is 68% 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 $108 while deals on United Airlines start at $158 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 Ethiopian Air (98%), ITA Airways (98%) or Avianca (97%) 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 $1,004, our data shows the cheapest flight currently is $213. When looking at the most popular route, (Denver Intl - Washington, D.C. Dulles Intl), you can expect to pay $236 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 $336). 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
Chantilly
Woodbridge
Arlington
Owings Mills
Sterling
Lanham
Reston
Herndon
Hyattsville
Rockville
Springfield
Fredericksburg
Tysons
Falls Church
Towson
Silver Spring
Oxon Hill
Laurel
Clinton

Browse thousands of different options on Cheapflights for your next trip

Top 3 airlines flying from Denver to Dulles Intl

AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$145Average$308FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$216Average$387FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$269Average$504FlexibilityNo cancel feeOn-time69%

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