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Dulles Intl

$69+ Cheap flights from Denver (DEN) 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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — IAD
Jan 17 — Jan 241
Sat 1/17
Sat 1/24
1 adult, Economy
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1. Tell us where you want to go

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Cheapflights Tip: The best prices from Denver Intl to Washington, D.C. Dulles Intl are usually found in August or January, booked 87 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
Explore the most affordable flight options available from Denver to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 18, 2025.

This Frontier deal was found by Cheapflights users on 12/16. 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.
Mon 12/2912:14 amDEN - IAD
1 stop9h 24mFrontier
Mon 1/124:22 pmIAD - DEN
1 stop7h 16mFrontier
Deal found 12/16$253
This Super.com deal was found by Cheapflights users on 12/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2011:59 pmDEN - IAD
1 stop13h 54mFrontier
Mon 1/510:43 amIAD - DEN
1 stop24h 57mFrontier
Deal found 12/16$264
This Mytrip deal was found by Cheapflights users on 12/15. 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.
Mon 12/2912:14 amDEN - IAD
1 stop9h 24mFrontier
Mon 1/510:43 amIAD - DEN
1 stop24h 57mFrontier
Deal found 12/15$268
This Super.com deal was found by Cheapflights users on 12/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2511:59 pmDEN - IAD
1 stop7h 49mFrontier
Tue 1/66:00 amIAD - DEN
1 stop8h 21mFrontier
Deal found 12/16$278
This CheapOair deal was found by Cheapflights users on 12/16. 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.
Thu 12/256:00 amDEN - IAD
1 stop25h 48mFrontier
Mon 12/292:09 pmIAD - DEN
1 stop20h 39mFrontier
Deal found 12/16$285
This Priceline deal was found by Cheapflights users on 12/16. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1811:59 pmDEN - IAD
1 stop7h 49mFrontier
Tue 1/66:00 amIAD - DEN
1 stop8h 21mFrontier
Deal found 12/16$298
This Orbitz deal was found by Cheapflights users on 12/16. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/2011:59 pmDEN - IAD
1 stop13h 54mFrontier
Mon 12/292:09 pmIAD - DEN
1 stop20h 39mFrontier
Deal found 12/16$304
This Kiwi.com deal was found by Cheapflights users on 12/15. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:06 amDEN - IAD
1 stop24h 39mMultiple Airlines
Mon 1/57:06 pmIAD - DEN
2 stops24h 57mMultiple Airlines
Deal found 12/15$305
This Orbitz deal was found by Cheapflights users on 12/15. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/196:00 amDEN - IAD
1 stop24h 51mFrontier
Tue 1/66:00 amIAD - DEN
1 stop8h 21mFrontier
Deal found 12/15$312
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3011:06 amDEN - IAD
1 stop24h 39mMultiple Airlines
Sat 1/34:57 pmIAD - DEN
1 stop16h 46mMultiple Airlines
Deal found 12/16$319
This American Airlines deal was found by Cheapflights users on 12/16. 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.
Thu 12/2510:30 amDEN - IAD
1 stop10h 03mAmerican Airlines
Tue 1/611:34 amIAD - DEN
2 stops11h 19mAmerican Airlines
Deal found 12/16$323
This Kiwi.com deal was found by Cheapflights users on 12/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/296:05 amDEN - IAD
2 stops36h 58mMultiple Airlines
Sat 1/34:57 pmIAD - DEN
1 stop16h 46mMultiple Airlines
Deal found 12/16$325

Find flight deals from Denver to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Denver (DEN) 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 December 18, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$146
(Kiwi.com)

One-way from

$69
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$407

Good round-trip deal

$386 or less

Good one-way deal

$209 or less
Provider with most accurate pricing for Denver Intl-Washington, D.C. Dulles Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Washington, D.C. Dulles Intl flights.
Search Deals
From Denver Intl to Washington, D.C. Dulles Intl
Search Deals
One-way flight from Denver Intl to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals
Price to beat on a round-trip flight from Denver Intl to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Denver Intl to Washington, D.C. Dulles Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Denver 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 December 18, 2025.
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

Denver

Fly to

Dulles Intl

Route

Depart

Return

Price

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Tue 2/3

9:50 am-3:12 pm

Nonstop3h 22m

Washington, D.C. Dulles Intl

Tue 2/3

5:15 pm-7:26 pm

Nonstop4h 11m

$172

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sat 1/24

5:00 pm-10:10 pm

Nonstop3h 10m

Washington, D.C. Dulles Intl

Tue 1/27

5:30 pm-7:35 pm

Nonstop4h 05m

$177

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sat 2/7

7:45 am-1:12 pm

Nonstop3h 27m

Washington, D.C. Dulles Intl

Tue 2/10

5:15 pm-7:26 pm

Nonstop4h 11m

$177

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 1/15

11:59 pm-5:21 am

Nonstop3h 22m

Washington, D.C. Dulles Intl

Wed 1/21

8:15 am-10:27 am

Nonstop4h 12m

$197

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sun 1/18

7:50 am-1:17 pm

Nonstop3h 27m

Washington, D.C. Dulles Intl

Sat 1/24

5:15 pm-7:26 pm

Nonstop4h 11m

$197

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 2/18

11:59 pm-5:18 am

Nonstop3h 19m

Washington, D.C. Dulles Intl

Mon 2/23

10:25 pm-12:30 am

Nonstop4h 05m

$197

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Fri 1/16

5:25 pm-10:40 pm

Nonstop3h 15m

Washington, D.C. Dulles Intl

Fri 1/23

5:30 pm-7:35 pm

Nonstop4h 05m

$217

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 2/11

10:35 am-3:50 pm

Nonstop3h 15m

Washington, D.C. Dulles Intl

Mon 2/16

5:10 am-7:10 am

Nonstop4h 00m

$217

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sat 1/10

5:00 pm-10:10 pm

Nonstop3h 10m

Washington, D.C. Dulles Intl

Sat 1/17

3:45 pm-5:50 pm

Nonstop4h 05m

$217

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 2/19

10:20 am-3:44 pm

Nonstop3h 24m

Washington, D.C. Dulles Intl

Fri 2/20

7:42 pm-9:47 pm

Nonstop4h 05m

$217

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/16

Showing 1-10 of 23 results
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Compare providers for flights from Denver 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 Denver to Dulles Intl in December.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
CheapOairPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy1 starTrust Score*3 stars
CheapfaremartPrice 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 CheapOair to be most consistent on Cheapflights vs. CheapOair Users can find the same prices on Denver-Washington, D.C. Dulles Intl Airport flight deals on Cheapflights vs. CheapOair >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 CheapOair the most. CheapOair 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
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 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?

Use this chart to determine the optimal time to book a round-trip flight from Denver to Dulles Intl. Price data was last updated on December 12, 2025.

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 87 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, March is the cheapest month in which you can book a flight from Denver to Washington, D.C. Dulles Intl Airport (average of $146). Flying from Denver to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $236). 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?

Find hourly flight availability from Denver 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 December 18, 2025.

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 25% on the cost of your flight, compared to a flight in the afternoon.

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

Use this chart to determine the cheapest time to fly round-trip from Denver to Dulles Intl. Price data was last updated on December 13, 2025.

Travelers seeking maximum savings on their Denver to Washington, D.C. Dulles Intl Airport flight should consider departing on Friday at noon when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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

AI-powered summary based on content written by travel experts. AI can make mistakes.
Cheapflights partnered with top experts to bring you the best recommendations for your Denver to Washington, D.C. Dulles Intl Airport trip
Airports
DEN

Use the A Line train for a quick 37-minute ride from DEN to Union Station, avoiding expensive taxis and rideshares.

Read more about DENBy Emily Zemler
IAD

Take the Silver Line Metro from IAD to downtown Washington in under 40 minutes, a cost-effective travel option.

Read more about IADBy Ramsey Qubein
Our travel experts
Emily Zemler

Emily Zemler

Expert on DEN

Emily Zemler

Emily Zemler

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

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

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 December 18, 2025.
Read reviews from past customers who have flown Southwest, United Airlines, and Frontier 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
4,249 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Overall

7.9

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
7.9
Good
4,249 reviews
Southwest
7.9
Good
4,249 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Overall

7.9

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,092 reviews
Southwest
7.9
Good
4,249 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Overall

7.9

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.8
Fair
3,082 reviews
Southwest
7.9
Good
4,249 reviews

Comfort

8.0

Entertainment

7.5

Boarding

8.1

Crew

8.6

Overall

7.9

Food

7.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

Related info for your journey

Find useful and relevant information for your journey from Denver 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 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 15 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 and Southwest can get you from Denver to Washington, D.C. Dulles Intl Airport in just under 3h 10m. 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 $111 on this airline. Additional options worth looking into are Southwest and United Airlines, starting at $177 and $211 round-trip. Users have found that Frontier is 66% 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 $57. Southwest flights start at $88 while deals on United Airlines start at $112 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 ITA Airways (100%), Ethiopian Air (97%) or United Airlines (91%) 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 $1,212, our data shows the cheapest flight currently is $149. When looking at the most popular route, (Denver Intl - Washington, D.C. Dulles Intl), you can expect to pay $172 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, March is the cheapest month in which you can book a flight from Denver to Washington, D.C. Dulles Intl Airport (average of $146). Flying from Denver to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $236). 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
Woodbridge
Tysons
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fredericksburg
Linthicum Heights
Rockville
Laurel
Towson
Manassas
National Harbor
Bowie
Largo
McLean
Clinton
Cordova

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Alternative routes for Denver to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Denver to Baltimore flights
Denver to Reagan-National flights
Colorado Springs to Baltimore flights
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Grand Junction to Dulles Intl flights
Hayden to Reagan-National flights
Grand Junction to Reagan-National flights
Vail to Reagan-National flights
Hayden to Baltimore flights
Durango to Baltimore flights
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Montrose to Baltimore flights
Vail to Baltimore flights
Aspen to Dulles Intl flights
Aspen to Reagan-National flights
Aspen to Baltimore flights
Gunnison to Dulles Intl flights
Montrose to Reagan-National flights
Gunnison to Baltimore flights

Top 3 airlines flying from Denver to Dulles Intl

Discover the top 3 airlines that operate flights from Denver 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 December 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$111Average$249FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$177Average$298FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$213Average$354FlexibilityNo cancel feeOn-time69%

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