HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dulles Intl

$98+ 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 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — IAD
Jan 9 — Jan 161
Thu 1/9
Thu 1/16
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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.

The best prices from Denver Intl to Washington, D.C. Dulles Intl are usually found in September or January, booked 54 days in advance, depart on a Wednesday 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 January 4, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$135
(Mytrip)

One-way from

$98
(Mytrip)

Popular in

March

Cheapest in

September

Average price

$298
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
High demand for flights, 4% potential price rise
Search Deals
Best time to find cheap flights, 2% potential price drop
Search Deals
Average for round-trip flights in January 2025
Search Deals

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 January 4, 2025.

This Mytrip deal was found by Cheapflights users on 1/3. 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.
Wed 1/2212:50 amDEN - IAD
1 stop15h 07mFrontier
Mon 1/276:05 pmIAD - DEN
1 stop16h 39mFrontier
Deal found 1/3$135
This Southwest deal was found by Cheapflights users on 1/3. 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.
Tue 2/49:50 amDEN - IAD
Nonstop3h 15mSouthwest
Tue 2/115:50 pmIAD - DEN
Nonstop4h 05mSouthwest
Deal found 1/3$177
This United Airlines deal was found by Cheapflights users on 1/3. 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.
Sun 2/96:10 pmDEN - IAD
Nonstop3h 20mUnited Airlines
Sat 2/155:15 pmIAD - DEN
Nonstop4h 09mUnited Airlines
Deal found 1/3$197
This Delta deal was found by Cheapflights users on 1/3. 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.
Sat 2/16:15 amDEN - IAD
1 stop7h 38mDelta
Tue 2/44:05 pmIAD - DEN
1 stop9h 37mDelta
Deal found 1/3$237
This Cheapflightsfares deal was found by Cheapflights users on 1/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/245:50 pmDEN - IAD
1 stop14h 33mSun Country Air
Sun 4/2712:17 pmIAD - DEN
1 stop6h 58mSun Country Air
Deal found 1/3$251
This American Airlines deal was found by Cheapflights users on 1/3. 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.
Sat 2/16:01 amDEN - IAD
2 stops11h 34mAmerican Airlines
Tue 2/49:11 amIAD - DEN
1 stop6h 24mAmerican Airlines
Deal found 1/3$294
This Mytrip deal was found by Cheapflights users on 1/3. 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.
Wed 4/2312:39 amDEN - IAD
1 stop13h 44mMultiple Airlines
Sun 4/2712:17 pmIAD - DEN
1 stop6h 58mMultiple Airlines
Deal found 1/3$335

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 January 4, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 1/22

12:50 am-5:57 pm

1 stop15h 07m

Washington, D.C. Dulles Intl

Mon 1/27

6:05 pm-8:44 am

1 stop16h 39m

$135

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Tue 2/4

9:50 am-3:05 pm

Nonstop3h 15m

Washington, D.C. Dulles Intl

Tue 2/11

5:50 pm-7:55 pm

Nonstop4h 05m

$177

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sun 2/9

6:10 pm-11:30 pm

Nonstop3h 20m

Washington, D.C. Dulles Intl

Sat 2/15

5:15 pm-7:24 pm

Nonstop4h 09m

$197

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sat 2/1

6:15 am-3:53 pm

1 stop7h 38m

Washington, D.C. Dulles Intl

Thu 2/6

4:05 pm-11:42 pm

1 stop9h 37m

$237

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 4/24

5:50 pm-10:23 am

1 stop14h 33m

Washington, D.C. Dulles Intl

Sun 4/27

12:17 pm-5:15 pm

1 stop6h 58m

$251

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Tue 2/18

6:30 am-4:56 pm

1 stop8h 26m

Washington, D.C. Dulles Intl

Fri 2/21

9:12 am-1:34 pm

1 stop6h 22m

$289

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 4/23

12:39 am-4:23 pm

1 stop13h 44m

Washington, D.C. Dulles Intl

Sun 4/27

12:17 pm-5:15 pm

1 stop6h 58m

$335

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 1/30

12:50 am-6:19 pm

1 stop15h 29m

$98

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 2/6

6:00 am-11:23 am

Nonstop3h 23m

$109

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sat 2/22

10:05 am-9:00 pm

1 stop8h 55m

$111

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/3

Showing 1-10 of 16 results
1
2

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 January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
CheapTicketsDealPrice Accuracy3 starsTrust 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
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 December 27, 2024.

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 54 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 $389). 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 January 4, 2025.

It’s optimal to fly from Denver to Washington, D.C. Dulles Intl Airport in the evening. By choosing this option you can save up to 15% on the cost of your flight, compared to a flight at noon.

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 16, 2024.

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

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 January 4, 2025.

The most flights from DEN to IAD are scheduled on a Friday (22 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 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 January 4, 2025.
Read through reviews of airlines operating flights from Denver to Washington, D.C., such as Frontier, United 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
4,679 reviews

Food

7.2

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,679 reviews
Southwest
8.1
Very good
4,679 reviews

Food

7.2

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,605 reviews
Southwest
8.1
Very good
4,679 reviews

Food

7.2

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,526 reviews
Southwest
8.1
Very good
4,679 reviews

Food

7.2

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,966 reviews
Southwest
8.1
Very good
4,679 reviews

Food

7.2

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Allegiant Air
7.4
Good
805 reviews
Southwest
8.1
Very good
4,679 reviews

Food

7.2

Overall

8.1

Entertainment

7.7

Comfort

8.1

Crew

8.7

Boarding

8.2

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 14 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 $135 on this airline. Additional options worth looking into are Southwest and United Airlines, starting at $177 and $197 round-trip. Users have found that Frontier is 61% 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 $98. United Airlines flights start at $109 while deals on Delta start at $119 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 (92%), Avianca (90%) or Copa Airlines (89%) 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 $1,049, 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 $160 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 $389). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 Dulles Intl flights
Colorado Springs to Baltimore flights
Vail to Dulles Intl flights
Colorado Springs to Reagan-National flights
Vail to Baltimore flights
Hayden to Dulles Intl flights
Grand Junction to Dulles Intl flights
Grand Junction to Baltimore flights
Aspen to Dulles Intl flights
Vail to Reagan-National flights
Aspen to Reagan-National flights
Hayden to Reagan-National flights
Aspen to Baltimore flights
Hayden to Baltimore flights
Grand Junction to Reagan-National flights
Montrose to Reagan-National flights
Montrose to Dulles Intl flights
Durango to Reagan-National flights
Durango to Baltimore flights
Gunnison to Baltimore flights
Gunnison to Dulles Intl flights
Durango to Dulles Intl flights
Montrose to Baltimore 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 January 4, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$107Average$243FlexibilityNo cancel feeOn-time62%
DeltaCheapest$134Average$301FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$202Average$355FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$218Average$330FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$227Average$440FlexibilityNo cancel feeOn-time71%
100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.