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 $179 on this airline. Additional options worth looking into are Southwest and United Airlines, starting at $187 and $195 round-trip. Frontier is currently priced 48% 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?

$96 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 $99 and $104, respectively.

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.

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).

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 $790, our data indicates the cheapest price to be $115. The most popular route (Washington, D.C. Dulles Intl - Denver Intl), is priced around $177.

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 (82%), Copa Airlines (76%), United Airlines( 75%).

What are the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to Denver?

The most popular airlines flying from Washington, D.C. Dulles Intl Airport to Denver are American Airlines, Delta and Frontier. Something to consider prior to booking your flight.

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

Saturday flights are found to be more expensive to fly from Washington, D.C. Dulles Intl Airport to Denver. This shouldn’t discourage you from searching, as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Denver.

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

September can be a great time to fly to Denver from Washington, D.C. Dulles Intl Airport with a flight ticket averaging about $283. Cheapflights users have found deals in the month of September for as cheap as $86. The most expensive prices can be found in the month of December.

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 24 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.

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.

$96+ Flights from Washington, D.C. Dulles Intl Airport to Denver

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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 84 days in advance, depart on a Wednesday or Tuesday and return on a Friday

Cheap flight deals from Dulles Intl to Denver

Round-trip from	$179 (Priceline)
One-way from	$96 (Priceline)
Popular in	December
Cheapest in	January
Average price	$343
Good round-trip deal	$282 or less
Good one-way deal	$158 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

Search Deals

Highest demand for flights based on searches. 1% potential increase in price ($6 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 July 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 July 3, 2025.

Fri 8/228:19 pmIAD - DEN

1 stop14h 17mFrontier

Tue 8/2612:53 pmDEN - IAD

1 stop6h 46mFrontier

Deal found 7/3

$180

Thu 9/254:30 pmIAD - DEN

1 stop8h 25mSouthwest

Tue 9/304:45 pmDEN - IAD

Nonstop3h 20mSouthwest

Deal found 7/2

$187

Thu 8/2810:25 amIAD - DEN

Nonstop3h 44mUnited Airlines

Sun 8/318:00 amDEN - IAD

Nonstop3h 26mUnited Airlines

Deal found 7/3

$195

Tue 8/267:44 amIAD - DEN

2 stops10h 00mAmerican Airlines

Tue 9/211:59 pmDEN - IAD

1 stop8h 08mAmerican Airlines

Deal found 7/2

$202

Best flights from Dulles Intl to Denver
Discover carefully curated flight deals from Dulles Intl to Denver that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 3, 2025.

Thu 7/176:06 pmIAD - DEN

1 stop7h 50mFrontier

Mon 7/216:10 pmDEN - IAD

1 stop10h 24mFrontier

Deal found 7/3

$179

Thu 9/254:30 pmIAD - DEN

1 stop8h 25mSouthwest

Tue 9/304:45 pmDEN - IAD

Nonstop3h 20mSouthwest

Deal found 7/2

$187

Thu 8/2810:25 amIAD - DEN

Nonstop3h 44mUnited Airlines

Sun 8/318:00 amDEN - IAD

Nonstop3h 26mUnited Airlines

Deal found 7/3

$195

Tue 8/267:44 amIAD - DEN

2 stops10h 00mAmerican Airlines

Tue 9/211:59 pmDEN - IAD

1 stop8h 08mAmerican Airlines

Deal found 7/2

$202

Last-minute flights from Dulles Intl to Denver
Discover last-minute flight deals from Dulles Intl to Denver. Data last updated July 3, 2025 and is based on user searches.

Tue 7/82:05 pmIAD - DEN

Nonstop3h 50mSouthwest

Tue 7/225:25 pmDEN - IAD

Nonstop3h 20mSouthwest

Deal found 6/30

$307

Sat 7/121:36 pmIAD - DEN

1 stop11h 35mFrontier

Tue 7/151:39 pmDEN - IAD

1 stop8h 33mFrontier

Deal found 7/1

$202

Sat 7/1212:40 pmIAD - DEN

1 stop10h 16mMultiple Airlines

Fri 7/1812:23 amDEN - IAD

1 stop10h 29mMultiple Airlines

Deal found 7/2

$311

Sat 8/910:34 pmIAD - DEN

Nonstop3h 56mUnited Airlines

Wed 8/136:01 amDEN - IAD

Nonstop3h 26mUnited Airlines

Deal found 7/3

$187

Wed 8/205:45 amIAD - DEN

Nonstop3h 35mSouthwest

Fri 8/225:30 pmDEN - IAD

Nonstop3h 20mSouthwest

Deal found 7/3

$188

Fri 8/228:19 pmIAD - DEN

1 stop14h 17mFrontier

Tue 8/2612:53 pmDEN - IAD

1 stop6h 46mFrontier

Deal found 7/3

$180

Tue 8/267:25 pmIAD - DEN

1 stop5h 30mAmerican Airlines

Tue 9/211:59 pmDEN - IAD

1 stop8h 08mAmerican Airlines

Deal found 7/2

$197

One-way flights from Dulles Intl to Denver
Search for one-way flight options from Dulles Intl to Denver. Find affordable one-way fares based on user searches. Data last updated July 3, 2025.

Sat 7/121:36 pmIAD - DEN

1 stop11h 35mFrontier

Deal found 7/1

$96

Wed 8/134:55 pmIAD - DEN

1 stop7h 35mSouthwest

Deal found 7/2

$99

Tue 9/1611:18 amIAD - DEN

2 stops12h 58mAmerican Airlines

Deal found 7/2

$104

Fri 8/158:06 pmIAD - DEN

Nonstop3h 51mUnited Airlines

Deal found 7/3

$109

Fri 7/257:36 pmIAD - DEN

1 stop6h 44mDelta

Deal found 7/1

$139

Thu 8/73:53 pmIAD - DEN

2 stops17h 17mAllegiant Air

Deal found 7/1

$152

Cheapflights Fare Finder

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

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 8/22

8:19 pm-8:36 am

1 stop14h 17m

Denver Intl

Tue 8/26

12:53 pm-9:39 pm

1 stop6h 46m

$180

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 9/25

4:30 pm-10:55 pm

1 stop8h 25m

Denver Intl

Sat 9/27

5:30 pm-10:50 pm

Nonstop3h 20m

$187

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 8/28

10:25 am-12:09 pm

Nonstop3h 44m

Denver Intl

Sun 8/31

8:00 am-1:26 pm

Nonstop3h 26m

$195

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 8/26

7:44 am-5:48 pm

2 stops12h 04m

Denver Intl

Wed 9/3

12:41 pm-10:45 pm

1 stop8h 04m

$202

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sat 7/12

1:36 pm-11:11 pm

1 stop11h 35m

$96

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Wed 8/13

4:55 pm-10:30 pm

1 stop7h 35m

$99

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 8/5

9:03 am-3:46 pm

2 stops8h 43m

$104

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 8/15

8:06 pm-9:57 pm

Nonstop3h 51m

$109

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 7/25

4:46 pm-7:16 am

1 stop16h 30m

$131

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 7/25

7:36 pm-12:20 am

1 stop6h 44m

$139

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/1

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

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.

DEN

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

Our travel experts

Emily Zemler

Expert on DEN

Ramsey Qubein

Expert on IAD

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 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?

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 27% 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?

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 mornings 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

The most flights from IAD to DEN are scheduled on a Wednesday (30 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (18 on average).

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to Denver?

Reviews of airlines servicing Denver

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

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Southwest

8.0

Very good

4,266 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Delta

8.0

Very good

7,982 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

United Airlines

7.4

Good

8,861 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Allegiant Air

7.3

Good

708 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

American Airlines

7.2

Good

10,000 reviews

Southwest

8.0

Very good

4,266 reviews

Reviews

1 / 20

8.0

Excellent

John,May 2025

PVD - BNA

It’s southwest so no frills but clean, efficient and got me to my location.

Related info for your journey

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 24 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.
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 $179 on this airline. Additional options worth looking into are Southwest and United Airlines, starting at $187 and $195 round-trip. Frontier is currently priced 48% 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?
$96 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 $99 and $104, 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 (82%), Copa Airlines (76%), United Airlines( 75%).
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 $790, our data indicates the cheapest price to be $115. 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

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Other flights to Denver

Top 5 airlines flying from Dulles Intl to Denver

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$80	Average$240	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$166	Average$262	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$199	Average$304	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$211	Average$365	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$216	Average$288	FlexibilityNo cancel fee	On-timeN/A

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$96+ 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 7/12. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Denver with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

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

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Dulles Intl to Denver

Cheapest flights from Dulles Intl to DenverExplore 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 July 3, 2025.

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 July 3, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Denver that are best for you.

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

Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. Dulles Intl Airport to Denver trip

Airports

IAD

DEN

Our travel experts

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.

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 June 27, 2025.

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

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 July 3, 2025.

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 June 29, 2025.

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 July 3, 2025.

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to Denver?

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 July 3, 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.

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?

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

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

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

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

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

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

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

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

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

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.

Top 5 airlines flying from Dulles Intl to Denver

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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 July 3, 2025.