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

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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
Sep 13 — Sep 201
Sun 9/13
Sun 9/20
1 adult, Economy
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Find cheap flights from Dulles Intl to Denver with Cheapflights

1. Tell us where you want to go

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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Denver Intl are usually found in January or February, booked 44 days in advance, depart on a Wednesday or Tuesday and return on a Thursday

Cheap flight deals from Dulles Intl to Denver

Cheapest flights from Dulles Intl to Denver
Explore the most affordable flight options available from Dulles Intl to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2026.

This Kiwi.com deal was found by Cheapflights users on 8/11. 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.
Fri 9/186:00 am -
1 stop11h 00m
Sun 9/207:10 pm -
1 stop20h 08m
Deal found 8/11$246
This Kiwi.com deal was found by Cheapflights users on 8/11. 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.
Fri 9/48:39 pm -
1 stop14h 40m
Mon 9/710:45 pm -
1 stop28h 16m
Deal found 8/11$247
This Kiwi.com deal was found by Cheapflights users on 8/14. 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.
Wed 9/26:20 am -
1 stop17h 50m
Mon 9/710:49 pm -
2 stops16h 25m
Deal found 8/14$248
This Justfly.com deal was found by Cheapflights users on 8/12. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/186:00 am -
1 stop11h 00m
Sun 9/2710:50 pm -
1 stop29h 30m
Deal found 8/12$249
This Expedia deal was found by Cheapflights users on 8/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:59 am -
1 stop14h 42m
Thu 9/311:59 pm -
1 stop14h 08m
Deal found 8/12$250
This FlightHub deal was found by Cheapflights users on 8/11. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/3012:28 pm -
1 stop28h 16m
Fri 9/46:30 am -
1 stop8h 44m
Deal found 8/11$251
This Kiwi.com deal was found by Cheapflights users on 8/13. 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.
Thu 9/38:59 am -
1 stop11h 01m
Tue 9/811:59 pm -
2 stops15h 19m
Deal found 8/13$252
This Kiwi.com deal was found by Cheapflights users on 8/10. 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.
Fri 9/259:04 pm -
2 stops20h 37m
Mon 9/286:38 pm -
1 stop9h 42m
Deal found 8/10$253
This Kiwi.com deal was found by Cheapflights users on 8/10. 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.
Fri 9/49:54 pm -
1 stop12h 13m
Tue 9/88:15 pm -
2 stops25h 55m
Deal found 8/10$255
This Trip.com deal was found by Cheapflights users on 8/14. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2811:12 am -
1 stop10h 25m
Thu 10/19:19 pm -
1 stop12h 14m
Deal found 8/14$257
This Trip.com deal was found by Cheapflights users on 8/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/268:59 am -
1 stop11h 01m
Tue 9/110:45 pm -
1 stop7h 19m
Deal found 8/9$258

Find flight deals from Dulles Intl to Denver

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Denver (DEN). 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 August 14, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$246
(Booking.com)

One-way from

$117
(Kiwi.com)

Popular in

July

Cheapest in

January

Average price

$465

Good round-trip deal

$398 or less

Good one-way deal

$328 or less
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Denver Intl flights.
Search Deals
From Washington, D.C. Dulles Intl to Denver Intl
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Denver Intl
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($96 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Denver Intl.
Search Deals
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Denver Intl.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Dulles Intl to Denver 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 August 14, 2026.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Denver that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Denver

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

IADDEN

Washington, D.C. Dulles Intl

Fri 10/16

10:34 pm-12:30 am

Nonstop3h 56m

Denver Intl

Sun 10/18

11:52 pm-5:17 am

Nonstop3h 25m

$319

Washington, D.C.Denver

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

IADDEN

Washington, D.C. Dulles Intl

Sun 9/13

6:30 am-8:24 am

Nonstop3h 54m

Denver Intl

Sun 9/20

6:00 am-11:25 am

Nonstop3h 25m

$319

Washington, D.C.Denver

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

IADDEN

Washington, D.C. Dulles Intl

Thu 9/10

10:34 pm-12:30 am

Nonstop3h 56m

Denver Intl

Mon 9/14

5:50 pm-11:19 pm

Nonstop3h 29m

$319

Washington, D.C.Denver

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

IADDEN

Washington, D.C. Dulles Intl

Wed 9/16

10:34 pm-12:30 am

Nonstop3h 56m

Denver Intl

Sat 9/19

1:58 pm-7:23 pm

Nonstop3h 25m

$319

Washington, D.C.Denver

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

IADDEN

Washington, D.C. Dulles Intl

Tue 9/15

10:34 pm-12:30 am

Nonstop3h 56m

Denver Intl

Sun 9/20

11:59 pm-5:25 am

Nonstop3h 26m

$319

Washington, D.C.Denver

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

IADDEN

Washington, D.C. Dulles Intl

Fri 9/4

5:26 pm-7:31 pm

Nonstop4h 05m

Denver Intl

Sun 9/6

8:00 am-1:29 pm

Nonstop3h 29m

$319

Washington, D.C.Denver

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

IADDEN

Washington, D.C. Dulles Intl

Fri 8/28

5:26 pm-7:30 pm

Nonstop4h 04m

Denver Intl

Tue 9/15

3:40 pm-9:08 pm

Nonstop3h 28m

$349
Quickest round-trip

Washington, D.C.Denver

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

IADDEN

Washington, D.C. Dulles Intl

Wed 9/2

2:43 pm-4:33 pm

Nonstop3h 50m

Denver Intl

Tue 9/8

11:59 pm-5:25 am

Nonstop3h 26m

$409

Washington, D.C.Denver

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

IADDEN

Washington, D.C. Dulles Intl

Thu 9/24

10:34 pm-12:30 am

Nonstop3h 56m

Denver Intl

Tue 9/29

1:58 pm-7:26 pm

Nonstop3h 28m

$409

Washington, D.C.Denver

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

IADDEN

Washington, D.C. Dulles Intl

Sat 9/5

10:34 pm-12:30 am

Nonstop3h 56m

Denver Intl

Sun 9/6

11:59 pm-5:25 am

Nonstop3h 26m

$409

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/13

Showing 1-10 of 23 resultsSorted by cheapest first
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Compare providers for flights from Dulles Intl to Denver

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 Dulles Intl to Denver in August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
CheapTicketsDealPrice 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 Washington, D.C. Dulles Intl Airport-Denver flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Denver flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Denver flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Denver 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 Washington, D.C. Dulles Intl Airport-Denver 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 Dulles Intl to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from Dulles Intl 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 Washington, D.C. Dulles Intl Airport to Denver

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

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to Denver, you should look to book at least 43 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Denver (average of $317). Flying from Washington, D.C. Dulles Intl Airport to Denver in July is currently the most expensive (average of $540). 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 IAD to DEN?

Find hourly flight availability from Dulles Intl to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2026.

It’s optimal to fly from Washington, D.C. Dulles Intl Airport to Denver in the evening. By choosing this option you can save up to 14% on the cost of your flight, compared to a flight in the morning.

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

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Denver. Price data was last updated on August 8, 2026.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Denver flight should consider departing on Wednesday evenings when fares are most often at their lowest. Monday evenings 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 Washington, D.C. Dulles Intl Airport to Denver?

Airfare is below average for this route at the moment.

Washington, D.C. Dulles Intl Airport to Denver flights typically cost between $373 and $549 in September.
The cheapest round-trip price found within the last 5 days was $246 on Frontier (Sep 18-Sep 20).

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

Get insights into the airlines that provide service to Denver. 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 Denver. Reviews last updated August 14, 2026.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Denver, such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,218 reviews

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

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
8.0
Very good
4,218 reviews
Southwest
8.0
Very good
4,218 reviews

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

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
Delta
7.8
Good
8,502 reviews
Southwest
8.0
Very good
4,218 reviews

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

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
10,108 reviews
Southwest
8.0
Very good
4,218 reviews

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

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
JetBlue
7.1
Good
3,036 reviews
Southwest
8.0
Very good
4,218 reviews

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

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
5.6
Fair
2,694 reviews
Southwest
8.0
Very good
4,218 reviews

Boarding

8.1

Entertainment

7.5

Overall

8.0

Food

7.0

Crew

8.6

Comfort

8.0

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 Dulles Intl to Denver. 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 into for flights to Denver from Washington, D.C. Dulles Intl?

    For a flight from Washington, D.C. Dulles Intl to Denver, you will be flying into Denver Intl. Denver Intl (DEN) is just 18.5 mi from the center of the city. Denver Intl is the only Denver airport and it handles 23 inbound flights from Washington, D.C. Dulles Intl per day. 6 airlines have flights to Denver Intl from Washington, D.C. Dulles Intl on a regular basis.

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

    United Airlines can get you from Washington, D.C. Dulles Intl Airport to Denver in just under 3h 56m. Your travel time will be generally consistent. There are 1448 mi between Washington, D.C. Dulles Intl Airport and Denver. All flights are typically nonstop.

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

    Our cheapest airline available from Washington, D.C. Dulles Intl Airport to Denver is Frontier. Our recent data shows that you can find tickets from as low as $80 on this airline. Additional options worth looking into are JetBlue and Southwest, starting at $161 and $178 round-trip. Frontier is currently priced 80% below the average price you’ll pay for this route.

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

    $88 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Southwest and American Airlines, with prices starting from $88 and $119, respectively.

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

    Before booking your flight to Denver from Washington, D.C. Dulles Intl Airport, check out the most reliable airlines to get you to your destination on time: Southwest (100%), Ethiopian Air (87%), United Airlines( 82%).

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

    Looking for the cheapest flight from Washington, D.C. Dulles Intl Airport to Denver? While on average our users pay $1,140, our data indicates the cheapest price to be $238. The most popular route (Washington, D.C. Dulles Intl - Denver Intl), is priced around $188.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Denver (average of $317). Flying from Washington, D.C. Dulles Intl Airport to Denver in July is currently the most expensive (average of $540). 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
Thornton
Westminster
Black Hawk
Lakewood
Centennial
Broomfield
Golden
Wheat Ridge
Silverthorne
Central City
Fort Morgan
Cripple Creek
Greeley
Winter Park
Limon
Manitou Springs
Frisco
Englewood
Glendale
Evergreen

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from Dulles Intl to Denver

Discover the top 6 airlines that operate flights from Dulles Intl to Denver. 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 August 14, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$80Average$270FlexibilityNo cancel feeOn-time62%
JetBlueCheapest$161Average$360FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$178Average$328FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$234Average$466FlexibilityNo cancel feeOn-time69%
DeltaCheapest$272Average$638FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$332Average$442FlexibilityNo cancel feeOn-time71%

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