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$94+ 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 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
Mar 5 — Mar 121
Thu 3/5
Thu 3/12
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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2. Select your favorite providers

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Cheapflights Tip: The best prices from Washington, D.C. Dulles Intl to Denver Intl are usually found in September or August, booked 64 days in advance, depart on a Wednesday or Thursday 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 February 3, 2026.

This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Sat 3/75:05 am
IAD
-
DEN
1 stop19h 39m
Frontier
Tue 3/1011:59 pm
DEN
-
IAD
1 stop22h 32m
Frontier
Deal found 2/2$117
This Expedia deal was found by Cheapflights users on 2/1. 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.
Mon 3/210:20 am
IAD
-
DEN
1 stop7h 01m
Frontier
Wed 3/411:59 pm
DEN
-
IAD
1 stop7h 26m
Frontier
Deal found 2/1$138
This Flightnetwork deal was found by Cheapflights users on 2/2. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/268:07 pm
IAD
-
DEN
1 stop25h 52m
Frontier
Fri 2/2712:59 am
DEN
-
IAD
1 stop6h 35m
Frontier
Deal found 2/2$143
This Trip.com deal was found by Cheapflights users on 2/1. 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.
Sat 2/2810:29 am
IAD
-
DEN
1 stop13h 06m
Frontier
Wed 3/411:59 pm
DEN
-
IAD
1 stop7h 26m
Frontier
Deal found 2/1$147
This Orbitz deal was found by Cheapflights users on 2/1. 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.
Thu 2/268:07 pm
IAD
-
DEN
1 stop25h 52m
Frontier
Sun 3/112:59 am
DEN
-
IAD
1 stop7h 41m
Frontier
Deal found 2/1$148
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/27:05 pm
IAD
-
DEN
1 stop16h 06m
Frontier
Wed 3/412:59 am
DEN
-
IAD
1 stop7h 34m
Frontier
Deal found 2/2$150
This Kiwi.com deal was found by Cheapflights users on 2/2. 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 3/27:05 pm
IAD
-
DEN
1 stop16h 06m
Multiple Airlines
Wed 3/42:19 pm
DEN
-
IAD
2 stops18h 14m
Multiple Airlines
Deal found 2/2$158
This Frontier deal was found by Cheapflights users on 2/2. 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.
Sat 2/2110:29 am
IAD
-
DEN
1 stop13h 04m
Frontier
Wed 2/256:20 pm
DEN
-
IAD
1 stop13h 05m
Frontier
Deal found 2/2$159
This Kiwi.com deal was found by Cheapflights users on 2/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/511:22 am
IAD
-
DEN
1 stop12h 17m
Frontier
Sun 3/811:59 pm
DEN
-
IAD
1 stop22h 32m
Frontier
Deal found 2/3$163

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 February 3, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$117
(Kiwi.com)

One-way from

$94
(Super.com)

Popular in

December

Cheapest in

September

Average price

$337

Good round-trip deal

$336 or less

Good one-way deal

$190 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. 5% potential increase in price ($18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 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 February 3, 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

Dulles Intl

Fly to

Denver

Route

Depart

Return

Price

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Wed 3/4

5:30 pm-7:35 pm

Nonstop4h 05m

Denver Intl

Wed 3/11

10:45 am-3:55 pm

Nonstop3h 10m

$177

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 2/26

5:10 am-7:10 am

Nonstop4h 00m

Denver Intl

Wed 3/4

4:45 pm-9:55 pm

Nonstop3h 10m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 2/24

12:38 pm-5:24 pm

1 stop6h 46m

Denver Intl

Wed 2/25

7:20 am-2:45 pm

1 stop5h 25m

$237

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 3/12

10:30 pm-12:30 am

Nonstop4h 00m

Denver Intl

Tue 3/17

11:59 pm-5:17 am

Nonstop3h 18m

$237

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 3/24

12:14 pm-5:17 pm

1 stop7h 03m

Denver Intl

Wed 3/25

5:45 am-2:39 pm

1 stop6h 54m

$237

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 2/27

7:35 pm-12:23 am

1 stop6h 48m

Denver Intl

Fri 3/6

12:59 am-11:35 am

1 stop8h 36m

$247

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 3/12

10:30 pm-12:30 am

Nonstop4h 00m

Denver Intl

Mon 3/16

11:59 pm-5:17 am

Nonstop3h 18m

$257

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sat 3/21

5:50 am-7:45 am

Nonstop3h 55m

Denver Intl

Thu 3/26

7:05 pm-12:15 am

Nonstop3h 10m

$257

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 3/13

7:29 pm-12:09 am

1 stop6h 40m

Denver Intl

Tue 3/17

5:45 am-2:39 pm

1 stop6h 54m

$257

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sat 2/21

5:05 am-7:05 am

Nonstop4h 00m

Denver Intl

Wed 2/25

10:35 am-3:50 pm

Nonstop3h 15m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/1

Showing 1-10 of 20 results
1
2

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 February.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars
JustAirTicketPrice Accuracy-Trust Score*1 star
PricelinePrice 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?

Use this chart to determine the optimal time to book a round-trip flight from Dulles Intl to Denver. Price data was last updated on January 30, 2026.

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 49 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 $133). Flying from Washington, D.C. Dulles Intl Airport to Denver in April is currently the most expensive (average of $243). 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 February 3, 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 20% 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 January 31, 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. Sunday mornings 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?

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 February 3, 2026.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Denver, such as Southwest, United Airlines, and American Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,272 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

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
4,272 reviews
Southwest
8.0
Very good
4,272 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

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
9,236 reviews
Southwest
8.0
Very good
4,272 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

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
American Airlines
7.2
Good
11,218 reviews
Southwest
8.0
Very good
4,272 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

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
5.7
Fair
3,051 reviews
Southwest
8.0
Very good
4,272 reviews

Boarding

8.1

Entertainment

7.5

Crew

8.6

Overall

8.0

Food

7.0

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 16 inbound flights from Washington, D.C. Dulles Intl per day. 4 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?

    Southwest, Delta, and United Airlines can get you from Washington, D.C. Dulles Intl Airport to Denver in just under 4h. Your travel time can differ by up to 2h 46m. There are 1448 mi between Washington, D.C. Dulles Intl Airport and Denver. This flight may include one or multiple stops.

  • 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 $82 on this airline. Additional options worth looking into are American Airlines and Southwest, starting at $166 and $177 round-trip. Frontier is currently priced 76% 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 United Airlines, with prices starting from $88 and $109, 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: Ethiopian Air (91%), United Airlines (85%), Avianca( 85%).

  • 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 $826, our data indicates the cheapest price to be $128. The most popular route (Washington, D.C. Dulles Intl - Denver Intl), is priced around $172.

  • 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 $133). Flying from Washington, D.C. Dulles Intl Airport to Denver in April is currently the most expensive (average of $243). 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
Black Hawk
Lakewood
Broomfield
Westminster
Golden
Centennial
Greeley
Lone Tree
Wheat Ridge
Silverthorne
Cripple Creek
Winter Park
Central City
Glendale
Manitou Springs
Frisco
Fort Morgan
Brighton
Evergreen

Browse thousands of different options on Cheapflights for your next trip

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Top 4 airlines flying from Dulles Intl to Denver

Discover the top 4 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 February 3, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$82Average$248FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$166Average$262FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$177Average$299FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$216Average$373FlexibilityNo cancel feeOn-time69%

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