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$84+ 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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
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 84 days in advance, depart on a Wednesday or Tuesday and return on a Friday

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 September 17, 2025.

Round-trip from

$150
(Priceline)

One-way from

$84
(American Airlines)

Popular in

December

Cheapest in

January

Average price

$317

Good round-trip deal

$327 or less

Good one-way deal

$148 or less
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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Highest demand for flights based on searches. 4% potential increase in price ($14 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in September 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 September 17, 2025.

This Priceline deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/21:55 pmIAD - DEN
1 stop8h 52mFrontier
Sat 10/411:40 amDEN - IAD
1 stop9h 16mFrontier
Deal found 9/15$150
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/69:52 pmIAD - DEN
1 stop12h 51mFrontier
Sat 11/812:25 pmDEN - IAD
1 stop9h 30mFrontier
Deal found 9/15$155
This Booking.com deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/309:52 pmIAD - DEN
1 stop12h 51mFrontier
Fri 10/311:42 pmDEN - IAD
1 stop7h 47mFrontier
Deal found 9/15$156
This CheapOair deal was found by Cheapflights users on 9/14. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/259:38 pmIAD - DEN
1 stop12h 37mFrontier
Sat 11/112:25 pmDEN - IAD
1 stop9h 30mFrontier
Deal found 9/14$157
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/161:07 pmIAD - DEN
1 stop13h 44mFrontier
Sun 10/1911:59 pmDEN - IAD
1 stop17h 15mFrontier
Deal found 9/15$159
This Frontier deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/291:55 pmIAD - DEN
1 stop8h 52mFrontier
Thu 10/212:59 amDEN - IAD
1 stop9h 56mFrontier
Deal found 9/15$160
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/142:50 pmIAD - DEN
1 stop19h 43mFrontier
Mon 11/171:42 pmDEN - IAD
1 stop8h 29mFrontier
Deal found 9/15$161
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/119:38 pmIAD - DEN
1 stop12h 37mFrontier
Thu 10/1611:59 pmDEN - IAD
1 stop17h 20mFrontier
Deal found 9/15$162
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/283:15 pmIAD - DEN
1 stop19h 15mFrontier
Sat 10/411:40 amDEN - IAD
1 stop9h 16mFrontier
Deal found 9/15$163
This CheapOair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/259:38 pmIAD - DEN
1 stop12h 37mFrontier
Sun 10/2612:25 amDEN - IAD
1 stop19h 13mFrontier
Deal found 9/15$164
This Booking.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/275:00 pmIAD - DEN
1 stop6h 26mFrontier
Wed 10/292:00 pmDEN - IAD
1 stop28h 57mFrontier
Deal found 9/16$165

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 September 17, 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

Tue 10/28

7:40 am-9:30 am

Nonstop3h 50m

Denver Intl

Wed 10/29

5:45 pm-11:05 pm

Nonstop3h 20m

$177

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Wed 11/12

10:10 pm-12:15 am

Nonstop4h 05m

Denver Intl

Mon 11/17

11:59 pm-5:16 am

Nonstop3h 17m

$197

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 11/11

5:45 pm-7:45 pm

Nonstop4h 00m

Denver Intl

Thu 11/13

5:25 am-5:10 pm

1 stop9h 45m

$207

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 11/11

5:45 pm-7:45 pm

Nonstop4h 00m

Denver Intl

Wed 11/12

7:25 am-5:05 pm

1 stop7h 40m

$207

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 12/12

10:10 pm-12:15 am

Nonstop4h 05m

Denver Intl

Sun 12/14

8:05 am-1:23 pm

Nonstop3h 18m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 10/7

10:09 pm-11:57 pm

Nonstop3h 48m

Denver Intl

Fri 10/17

11:59 pm-5:22 am

Nonstop3h 23m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 11/7

5:05 am-7:00 am

Nonstop3h 55m

Denver Intl

Fri 11/7

6:15 pm-11:30 pm

Nonstop3h 15m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 10/24

7:45 pm-9:35 pm

Nonstop3h 50m

Denver Intl

Mon 10/27

7:45 am-1:00 pm

Nonstop3h 15m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 11/6

5:05 am-7:00 am

Nonstop3h 55m

Denver Intl

Mon 11/10

1:50 pm-7:00 pm

Nonstop3h 10m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sat 10/11

3:33 pm-9:41 pm

1 stop8h 08m

Denver Intl

Sat 10/18

6:00 am-2:38 pm

1 stop6h 38m

$237

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 21 results
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The best insider tips for Washington, D.C. Dulles Intl Airport to Denver flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to Denver trip
Airports
IAD

For early morning flights, use the Aerotrain to quickly reach C and D gates from the main terminal.

Read more about IADby Ramsey Qubein
DEN

Take the A Line train from DEN to Union Station for a quick 37-minute ride into downtown Denver.

Read more about DENby Emily Zemler
Our travel experts
Emily Zemler

Emily Zemler

Expert on DEN

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on IAD

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

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 September 12, 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 84 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 September 17, 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 24% 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 September 14, 2025.

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.

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 September 17, 2025.
Read through reviews of airlines operating flights from Washington, D.C. Dulles Intl Airport to Denver, such as Southwest, Delta, and United Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Southwest
8.0
Very good
4,242 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Delta
8.0
Very good
7,961 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
United Airlines
7.4
Good
8,926 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines
Frontier
5.8
Fair
3,173 reviews
Southwest
8.0
Very good
4,242 reviews

Crew

8.6

Food

7.0

Boarding

8.1

Comfort

8.0

Entertainment

7.5

Overall

8.0

Reviews

1 / 20
2.0
Mediocre

Mike,Aug 2025

OKC - AUS

AC was not adequate, even on a night flight. WiFi subpar even for the airlines

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. 5 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 and United Airlines can get you from Washington, D.C. Dulles Intl Airport to Denver in just under 3h 50m. 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 $104 on this airline. Additional options worth looking into are American Airlines and Southwest, starting at $166 and $178 round-trip. Frontier is currently priced 69% 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 United Airlines and Southwest, with prices starting from $89 and $89, 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 (92%), Copa Airlines (79%), United Airlines( 78%).

  • 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 $779, our data indicates the cheapest price to be $98. The most popular route (Washington, D.C. Dulles Intl - Denver Intl), is priced around $177.

  • 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 Denver?

Book flights to Denver if you plan to visit one of these locations
Black Hawk
Westminster
Golden
Winter Park
Lakewood
Broomfield
Greeley
Lone Tree
Cripple Creek
Thornton
Silverthorne
Manitou Springs
Fort Morgan
Glendale
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker
Sterling

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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 5 airlines flying from Dulles Intl to Denver

Discover the top 5 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$104Average$248FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$166Average$246FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$178Average$296FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$219Average$373FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$301FlexibilityNo cancel feeOn-timeN/A

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