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$109+ 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 5/28. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
mai 4 — mai 111
dim. 5/4
dim. 5/11
1 adult, Economy
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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 51 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

Cheap 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 avril 29, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$217
(United Airlines)

One-way from

$109
(United Airlines)

Popular in

December

Cheapest in

January

Average price

$357

Good round-trip deal

$326 or less

Good one-way deal

$169 or less
Provider with most accurate pricing for Washington, D.C. Dulles Intl-Denver Intl flight deals.
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Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Denver Intl flights.
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From Washington, D.C. Dulles Intl to Denver Intl
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One-way flight from Washington, D.C. Dulles Intl to Denver Intl
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High demand for flights, 0% potential price rise
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in April 2025
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Denver Intl.
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Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Denver Intl.
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Find 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 avril 29, 2025.

This United Airlines deal was found by Cheapflights users on 4/28. 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.
mer. 6/410:19 pmIAD - DEN
Nonstop3h 56mUnited Airlines
mer. 6/1111:50 pmDEN - IAD
Nonstop3h 25mUnited Airlines
Deal found 4/28$217
This Southwest deal was found by Cheapflights users on 4/27. 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.
jeu. 7/37:50 pmIAD - DEN
Nonstop3h 55mSouthwest
sam. 7/56:00 pmDEN - IAD
Nonstop3h 30mSouthwest
Deal found 4/27$233
This Sun Country Air deal was found by Cheapflights users on 4/28. 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.
ven. 10/1012:40 pmIAD - DEN
1 stop21h 44mSun Country Air
jeu. 10/1610:03 amDEN - IAD
1 stop24h 24mSun Country Air
Deal found 4/28$235
This American Airlines deal was found by Cheapflights users on 4/28. 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.
sam. 6/711:50 amIAD - DEN
1 stop6h 11mAmerican Airlines
mar. 6/1011:59 pmDEN - IAD
1 stop6h 39mAmerican Airlines
Deal found 4/28$237
This Frontier deal was found by Cheapflights users on 4/28. 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.
mar. 5/2011:47 amIAD - DEN
1 stop12h 44mFrontier
mer. 5/215:29 pmDEN - IAD
1 stop10h 26mFrontier
Deal found 4/28$240
This Delta deal was found by Cheapflights users on 4/28. 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.
sam. 5/243:37 pmIAD - DEN
1 stop6h 42mDelta
mer. 5/282:35 pmDEN - IAD
1 stop6h 59mDelta
Deal found 4/28$245
This Gotogate deal was found by Cheapflights users on 4/27. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 5/217:45 amIAD - DEN
1 stop22h 15mMultiple Airlines
jeu. 5/226:54 pmDEN - IAD
1 stop14h 59mMultiple Airlines
Deal found 4/27$256
This Mytrip deal was found by Cheapflights users on 4/28. 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.
ven. 7/184:46 pmIAD - DEN
1 stop16h 30mAllegiant Air
dim. 7/205:42 pmDEN - IAD
1 stop18h 41mAllegiant Air
Deal found 4/28$264
This Alaska Airlines deal was found by Cheapflights users on 4/28. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/277:25 pmIAD - DEN
2 stops23h 24mAlaska Airlines
ven. 5/307:05 pmDEN - IAD
2 stops19h 09mAlaska Airlines
Deal found 4/28$405

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 avril 29, 2025.
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

mer. 6/4

8:20 am-10:10 am

Nonstop3h 50m

Denver Intl

sam. 6/7

7:05 pm-12:34 am

Nonstop3h 29m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

jeu. 7/3

7:50 pm-9:45 pm

Nonstop3h 55m

Denver Intl

sam. 7/5

6:00 pm-11:30 pm

Nonstop3h 30m

$233

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

ven. 10/10

12:40 pm-8:24 am

1 stop21h 44m

Denver Intl

jeu. 10/16

10:03 am-12:27 pm

1 stop24h 24m

$235

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

sam. 6/7

11:50 am-4:01 pm

1 stop6h 11m

Denver Intl

mar. 6/10

11:59 pm-8:38 am

1 stop6h 39m

$237

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

mar. 5/20

11:47 am-10:31 pm

1 stop12h 44m

Denver Intl

mer. 5/21

5:29 pm-5:55 am

1 stop10h 26m

$240

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

sam. 5/24

1:20 pm-8:19 pm

1 stop8h 59m

Denver Intl

sam. 5/31

3:35 pm-11:53 pm

1 stop6h 18m

$245

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

mer. 5/21

7:45 am-4:00 am

1 stop22h 15m

Denver Intl

jeu. 5/22

6:54 pm-11:53 am

1 stop14h 59m

$256

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

ven. 7/18

4:46 pm-7:16 am

1 stop16h 30m

Denver Intl

dim. 7/20

5:42 pm-2:23 pm

1 stop18h 41m

$264

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

mar. 5/27

7:25 pm-4:49 pm

2 stops23h 24m

Denver Intl

ven. 5/30

7:05 pm-4:14 pm

2 stops19h 09m

$405

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

mer. 5/28

10:19 pm-12:15 am

Nonstop3h 56m

$109

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 18 results
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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 April.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
eDreamsPrice Accuracy3 starsTrust Score*3 stars
PricelinePrice Accuracy2 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 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 eDreams the most. eDreams 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 April 25, 2025.

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 51 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, October is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Denver (average of $197). Flying from Washington, D.C. Dulles Intl Airport to Denver in March is currently the most expensive (average of $278). 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 avril 29, 2025.

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 32% 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 March 30, 2025.

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

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

Explore weekly flight availability from Dulles Intl to Denver. 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 avril 29, 2025.

The most flights from IAD to DEN are scheduled on a Monday (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 Denver by month

Plan your trip to Denver by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Denver ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Denver when rainfall is around 0.5 in.

Temperature in Denver by month

Plan your trip to Denver by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Denver, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

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 avril 29, 2025.
Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Washington, D.C. to Denver to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,961 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Alaska Airlines
8.0
Very good
9,961 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Southwest
8.0
Very good
4,292 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Delta
8.0
Very good
7,929 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
United Airlines
7.4
Good
8,696 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >
Allegiant Air
7.3
Good
734 reviews
Alaska Airlines
8.0
Very good
9,961 reviews

Overall

8.0

Entertainment

7.1

Food

7.1

Crew

8.5

Boarding

8.2

Comfort

7.9

Reviews

1 / 20
4.0
Okay

Anonymous,Apr 2025

LAS - STS

flight was delayed both ways even tho the weather was clear >

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 21 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.

  • 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 United Airlines. Our recent data shows that you can find tickets from as low as $217 on this airline. Additional options worth looking into are Southwest and American Airlines, starting at $233 and $237 round-trip. United Airlines is currently priced 38% 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?

    $109 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Southwest and Frontier, with prices starting from $117 and $118, 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 (91%), Ethiopian Air (90%), United Airlines( 86%).

  • 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 $815, our data indicates the cheapest price to be $126. The most popular route (Washington, D.C. Dulles Intl - Denver Intl), is priced around $217.

  • 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, October is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Denver (average of $197). Flying from Washington, D.C. Dulles Intl Airport to Denver in March is currently the most expensive (average of $278). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Washington, D.C. Dulles Intl Airport?

Book flights to Washington, D.C. Dulles Intl Airport if you plan to visit one of these locations
Westminster
Black Hawk
Winter Park
Lakewood
Cripple Creek
Silverthorne
Brighton
Golden
Greeley
Frisco
Grand Lake
Thornton
Central City
Glendale
Copper Mountain
Wheat Ridge
Longmont
Broomfield
Idaho Springs
Limon

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Dulles Intl to Denver

See prices for flight routes from nearby airports that may be better suited for you.
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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 avril 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$231FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$110Average$285FlexibilityNo cancel feeOn-time83%
American AirlinesCheapest$166Average$378FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$216Average$376FlexibilityNo cancel feeOn-time69%
DeltaCheapest$216Average$268FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$217Average$315FlexibilityNo cancel feeOn-time63%

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