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Dulles Intl

$75+ 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 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — IAD
mar. 22 — mar. 291
sáb. 3/22
sáb. 3/29
1 adult, Economy
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1. Tell us where you want to go
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The best prices from Denver Intl to Washington, D.C. Dulles Intl are usually found in September or January, booked 88 days in advance, depart on a Friday or Thursday and return on a Tuesday

Cheap 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 marzo 17, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$162
(CheapOair)

One-way from

$75
(Trip.com)

Popular in

March

Cheapest in

September

Average price

$398

Good round-trip deal

$377 or less

Good one-way deal

$191 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. 2% potential increase in price ($10 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in March 2025
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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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Find 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 marzo 17, 2025.

This CheapOair deal was found by Cheapflights users on 3/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/1312:01 amDEN - IAD
1 stop12h 49mFrontier
sáb. 5/1712:42 pmIAD - DEN
1 stop21h 36mFrontier
Deal found 3/15$162
This Southwest deal was found by Cheapflights users on 3/16. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/158:45 amDEN - IAD
Nonstop3h 20mSouthwest
mar. 4/227:50 amIAD - DEN
Nonstop3h 50mSouthwest
Deal found 3/16$217
This Sun Country Air deal was found by Cheapflights users on 3/16. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 4/128:45 amDEN - IAD
1 stop24h 05mSun Country Air
dom. 4/207:30 amIAD - DEN
1 stop11h 45mSun Country Air
Deal found 3/16$235
This CheapOair deal was found by Cheapflights users on 3/17. 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.
jue. 4/245:50 pmDEN - IAD
1 stop16h 33mMultiple Airlines
lun. 4/285:25 pmIAD - DEN
1 stop7h 55mMultiple Airlines
Deal found 3/17$239
This United Airlines deal was found by Cheapflights users on 3/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/146:00 amDEN - IAD
1 stop6h 33mUnited Airlines
mié. 4/165:30 pmIAD - DEN
Nonstop4h 03mUnited Airlines
Deal found 3/16$253
This Delta deal was found by Cheapflights users on 3/17. 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.
jue. 4/242:35 pmDEN - IAD
1 stop6h 56mDelta
lun. 4/286:00 amIAD - DEN
1 stop5h 32mDelta
Deal found 3/17$277
This American Airlines deal was found by Cheapflights users on 3/17. 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.
jue. 4/244:17 pmDEN - IAD
1 stop5h 39mAmerican Airlines
lun. 4/284:52 pmIAD - DEN
2 stops9h 01mAmerican Airlines
Deal found 3/17$294

Find flights from Denver to Dulles Intl within your budget

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 marzo 17, 2025.

Fly from

Denver

Fly to

Dulles Intl

Route

Depart

Return

Price

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

mar. 5/13

12:01 am-2:50 pm

1 stop12h 49m

Washington, D.C. Dulles Intl

sáb. 5/17

12:42 pm-8:18 am

1 stop21h 36m

$162

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

mar. 4/15

8:45 am-2:05 pm

Nonstop3h 20m

Washington, D.C. Dulles Intl

mar. 4/22

7:50 am-9:40 am

Nonstop3h 50m

$217

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

sáb. 4/12

8:45 am-10:50 am

1 stop24h 05m

Washington, D.C. Dulles Intl

dom. 4/20

7:30 am-5:15 pm

1 stop11h 45m

$235

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

jue. 4/24

5:50 pm-12:23 pm

1 stop16h 33m

Washington, D.C. Dulles Intl

lun. 4/28

5:25 pm-11:20 pm

1 stop7h 55m

$239

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

lun. 4/14

6:00 am-2:33 pm

1 stop6h 33m

Washington, D.C. Dulles Intl

mié. 4/16

5:30 pm-7:33 pm

Nonstop4h 03m

$253

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

jue. 4/24

2:35 pm-11:31 pm

1 stop6h 56m

Washington, D.C. Dulles Intl

sáb. 4/26

7:25 am-5:45 pm

1 stop12h 20m

$277

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

jue. 4/24

4:17 pm-11:56 pm

1 stop5h 39m

Washington, D.C. Dulles Intl

lun. 4/28

4:52 pm-11:53 pm

2 stops9h 01m

$294

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

mar. 6/3

8:00 pm-10:09 am

1 stop12h 09m

$75

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

mar. 4/15

12:55 am-9:07 am

1 stop6h 12m

$99

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

mié. 4/16

10:11 am-3:32 pm

Nonstop3h 21m

$109

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/16

Showing 1-10 of 17 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 March.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust Score*3 stars
CheapfaremartPrice Accuracy-Trust Score*3 stars
CheapOairPrice Accuracy1 starTrust 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.

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

Find out what our experts recommend to make the most of your Denver to Washington, D.C. Dulles Intl Airport trip
Airports
DEN

For a quick security experience, use the DEN Reserve to book a time slot online for general screening.

Read more about DENby Emily Zemler
IAD

The Silver Line Metro connects IAD to downtown D.C. in under 40 minutes, offering a cost-effective transit 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

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.

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.

Travel insights for flights from Denver to Dulles Intl

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

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 March 14, 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 88 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, August is the cheapest month in which you can book a flight from Denver to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Denver to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $387). 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 marzo 17, 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 35% 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?

Use this chart to determine the cheapest time to fly round-trip from Denver to Dulles Intl. Price data was last updated on March 16, 2025.

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

Weekly flight availability from Denver to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Denver 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 marzo 17, 2025.

The most flights from DEN to IAD are scheduled on a Thursday (24 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (18 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 marzo 17, 2025.
Read through reviews of airlines operating flights from Denver to Washington, D.C., such as Southwest, Alaska Airlines and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,280 reviews

Crew

8.7

Boarding

8.2

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest
8.1
Very good
4,280 reviews
Southwest
8.1
Very good
4,280 reviews

Crew

8.7

Boarding

8.2

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Alaska Airlines
8.0
Very good
9,750 reviews
Southwest
8.1
Very good
4,280 reviews

Crew

8.7

Boarding

8.2

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Delta
8.0
Very good
7,914 reviews
Southwest
8.1
Very good
4,280 reviews

Crew

8.7

Boarding

8.2

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Hawaiian Airlines
7.9
Good
2,323 reviews
Southwest
8.1
Very good
4,280 reviews

Crew

8.7

Boarding

8.2

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines
7.4
Good
8,615 reviews
Southwest
8.1
Very good
4,280 reviews

Crew

8.7

Boarding

8.2

Food

7.1

Overall

8.1

Entertainment

7.6

Comfort

8.1

Reviews

1 / 20

8.0
Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

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 21 outbound flights to Washington, D.C. Dulles Intl per day from 5 airlines. Denver Intl is conveniently located just 18.5 mi from Denver’s city center.

  • 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 $162 on this airline. Additional options worth looking into are Southwest and Sun Country Air, starting at $217 and $235 round-trip. Users have found that Frontier is 53% 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 $75. Delta flights start at $99 while deals on United Airlines start at $109 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 Copa Airlines (91%), United Airlines (90%) or Lufthansa (90%) 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 $2,381, our data shows the cheapest flight currently is $134. When looking at the most popular route, (Denver Intl - Washington, D.C. Dulles Intl), you can expect to pay $190 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, August is the cheapest month in which you can book a flight from Denver to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Denver to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $387). 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 Denver?

Book flights to Denver if you plan to visit one of these locations
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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 Reagan-National flights
Denver to Baltimore flights
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Gunnison to Dulles Intl flights

Top 5 airlines flying from Denver to Dulles Intl

Discover the top 5 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 marzo 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$110Average$224FlexibilityNo cancel feeOn-time62%
DeltaCheapest$138Average$336FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$211Average$355FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$218Average$324FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$227Average$401FlexibilityNo cancel feeOn-time71%
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