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

Frontier, American Airlines, and Southwest can get you from Colorado to Washington, D.C. Dulles Intl Airport in just under 3h 20m. Your travel time can differ by up to 13h 55m. The distance between Colorado and Washington, D.C. Dulles Intl Airport is about 1448 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

The cheapest airlines for a one-way flight from Colorado to Washington, D.C. Dulles Intl Airport are American Airlines ($84), Frontier ($88), and United Airlines ($89).

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

What are the most popular routes from Colorado to Washington, D.C. Dulles Intl Airport?

The most popular route from Colorado to Washington, D.C. Dulles Intl Airport is Denver Intl - Washington, D.C. Dulles Intl. You may also consider Colorado Springs - Washington, D.C. Dulles Intl or Vail Eagle County - Washington, D.C. Dulles Intl.

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

Looking at all options, your cheapest flight can be booked for $108. While the most popular route (Denver Intl - Washington, D.C. Dulles Intl) can be booked for $162 on average, our data indicates $1,314 when flying from Colorado to Washington, D.C. Dulles Intl Airport.

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

Consider Avianca (92%), Brussels Airlines (78%) or United Airlines (76%) when booking your flight. These represent the most reliable airlines when flying from Colorado to Washington, D.C. Dulles Intl Airport.

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

When booking a flight from Colorado to Washington, D.C. Dulles Intl Airport, you may want to consider flying on Delta, Frontier or United Airlines as they are the most popular for this route.

How far in advance should I book a flight from Colorado to Washington, D.C. Dulles Intl Airport?

To save on the cost of your flight from Colorado to Washington, D.C. Dulles Intl Airport, book at least 53 days before your planned departure. Booking around this time can save you about 119% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $238 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $360.

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

Our data shows that August tends to be the cheapest month to fly to Washington, D.C. Dulles Intl Airport from Colorado. Users have commonly found prices around $262 for the month, but tickets can be as low as $125. Due to multiple factors, prepare for potentially higher prices in December.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Colorado to Dulles Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$84+ Cheap Flights from Colorado to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Colorado to Dulles Intl

Round-trip from	$150 (Priceline)
One-way from	$84 (American Airlines)
Popular in	December
Cheapest in	August
Average price	$237
Good round-trip deal	$306 or less
Good one-way deal	$197 or less

From Colorado to Washington, D.C. Dulles Intl

Search Deals

One-way flight from Colorado to Washington, D.C. Dulles Intl

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Highest demand for flights based on searches. 6% potential increase in price ($19 potential increase over avg. RT price).

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Cheapest flight prices on average. 1% potential price decrease ($4 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 Colorado to Washington, D.C. Dulles Intl.

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Price to beat on a one-way flight from Colorado to Washington, D.C. Dulles Intl.

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Find flight deals from Colorado to Dulles Intl

Cheapest flights from Colorado to Dulles Intl
Explore the most affordable flight options available from Colorado to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

Mon 11/171:42 pmDEN - IAD

1 stop8h 29mFrontier

Wed 11/198:40 amIAD - DEN

1 stop7h 05mFrontier

Deal found 9/14

$150

Thu 10/212:59 amDEN - IAD

1 stop9h 56mFrontier

Sun 10/510:09 pmIAD - DEN

1 stop12h 27mFrontier

Deal found 9/14

$155

Fri 10/171:42 pmDEN - IAD

1 stop7h 47mFrontier

Mon 10/207:59 pmIAD - DEN

1 stop23h 10mFrontier

Deal found 9/14

$156

Thu 10/231:42 pmDEN - IAD

1 stop7h 47mFrontier

Sun 10/268:02 pmIAD - DEN

1 stop23h 05mFrontier

Deal found 9/14

$157

Wed 10/292:00 pmDEN - IAD

1 stop28h 57mFrontier

Thu 11/69:52 pmIAD - DEN

1 stop12h 51mFrontier

Deal found 9/15

$159

Wed 10/2212:59 amDEN - IAD

1 stop12h 39mFrontier

Wed 10/298:47 amIAD - DEN

1 stop6h 58mFrontier

Deal found 9/14

$160

Wed 10/2912:34 amDEN - IAD

1 stop12h 32mFrontier

Wed 11/58:40 amIAD - DEN

1 stop7h 05mFrontier

Deal found 9/14

$161

Wed 11/1212:16 amDEN - IAD

1 stop17h 35mFrontier

Sun 11/1610:54 pmIAD - DEN

1 stop11h 49mFrontier

Deal found 9/14

$162

Fri 9/2612:04 amDEN - IAD

1 stop16h 20mFrontier

Mon 10/61:55 pmIAD - DEN

1 stop8h 52mFrontier

Deal found 9/14

$163

Thu 10/2312:36 amDEN - IAD

1 stop18h 37mFrontier

Mon 11/38:36 pmIAD - DEN

1 stop28h 40mFrontier

Deal found 9/14

$164

Fri 10/1712:36 amDEN - IAD

1 stop18h 17mFrontier

Sat 10/259:38 pmIAD - DEN

1 stop12h 37mFrontier

Deal found 9/14

$165

Sat 11/112:09 pmCOS - IAD

1 stop7h 22mAmerican Airlines

Wed 11/56:04 amIAD - COS

1 stop7h 44mAmerican Airlines

Deal found 9/14

$167

Best flights from Colorado to Dulles Intl
Discover carefully curated flight deals from Colorado to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 15, 2025.

Sun 10/1911:59 pmDEN - IAD

1 stop17h 15mFrontier

Tue 10/288:47 amIAD - DEN

1 stop6h 58mFrontier

Deal found 9/15

$155

Sat 11/112:09 pmCOS - IAD

1 stop7h 22mAmerican Airlines

Wed 11/56:04 amIAD - COS

1 stop7h 44mAmerican Airlines

Deal found 9/14

$167

Sat 10/185:40 pmDEN - IAD

Nonstop3h 20mSouthwest

Sat 10/256:40 amIAD - DEN

Nonstop3h 50mSouthwest

Deal found 9/14

$177

Thu 10/1611:59 pmDEN - IAD

Nonstop3h 23mUnited Airlines

Wed 10/2210:09 pmIAD - DEN

Nonstop3h 48mUnited Airlines

Deal found 9/14

$197

Tue 3/101:40 pmCOS - IAD

1 stop5h 33mDelta

Wed 3/116:00 amIAD - COS

1 stop9h 05mDelta

Deal found 9/14

$237

Fri 10/241:42 pmDEN - IAD

1 stop7h 47mFrontier

Sun 10/268:02 pmIAD - DEN

1 stop29h 14mFrontier

Deal found 9/15

$157

Fri 10/1712:36 amDEN - IAD

1 stop18h 17mFrontier

Mon 10/275:00 pmIAD - DEN

1 stop6h 26mFrontier

Deal found 9/15

$157

Wed 11/510:30 amDEN - IAD

Nonstop3h 15mSouthwest

Wed 11/127:40 amIAD - DEN

Nonstop3h 50mSouthwest

Deal found 9/13

$177

Mon 10/2711:59 pmDEN - IAD

Nonstop3h 17mUnited Airlines

Wed 10/2910:10 pmIAD - DEN

Nonstop4h 05mUnited Airlines

Deal found 9/14

$197

Wed 10/812:34 amDEN - IAD

1 stop11h 51mFrontier

Sun 10/127:27 pmIAD - DEN

1 stop29h 49mFrontier

Deal found 9/15

$168

Thu 12/410:30 amDEN - IAD

Nonstop3h 15mSouthwest

Sat 12/63:55 pmIAD - DEN

Nonstop3h 55mSouthwest

Deal found 9/14

$197

Sat 11/812:45 pmHDN - IAD

1 stop7h 30mSouthwest

Mon 11/105:05 amIAD - HDN

1 stop7h 55mSouthwest

Deal found 9/15

$199

Last-minute flights from Colorado to Dulles Intl
Discover last-minute flight deals from Colorado to Dulles Intl. Data last updated September 15, 2025 and is based on user searches.

Fri 9/269:18 pmDEN - IAD

1 stop12h 44mFrontier

Mon 9/291:55 pmIAD - DEN

1 stop8h 52mFrontier

Deal found 9/13

$163

Wed 10/18:20 amDEN - IAD

Nonstop3h 20mSouthwest

Sat 10/46:40 amIAD - DEN

Nonstop3h 50mSouthwest

Deal found 9/12

$149

Thu 10/212:59 amDEN - IAD

1 stop9h 56mFrontier

Thu 10/91:07 pmIAD - DEN

1 stop21h 36mFrontier

Deal found 9/15

$155

Thu 10/212:59 amDEN - IAD

1 stop9h 56mFrontier

Sat 10/119:38 pmIAD - DEN

1 stop12h 37mFrontier

Deal found 9/13

$157

Thu 10/21:12 pmDEN - IAD

1 stop8h 27mFrontier

Thu 10/91:07 pmIAD - DEN

1 stop13h 52mFrontier

Deal found 9/13

$165

Wed 10/811:59 pmDEN - IAD

1 stop10h 23mFrontier

Sat 10/119:38 pmIAD - DEN

1 stop12h 37mFrontier

Deal found 9/14

$162

Fri 10/171:42 pmDEN - IAD

1 stop7h 47mFrontier

Mon 10/207:59 pmIAD - DEN

1 stop23h 10mFrontier

Deal found 9/14

$156

Tue 10/213:25 pmDRO - IAD

1 stop5h 57mUnited Airlines

Tue 10/282:25 pmIAD - DRO

1 stop8h 09mUnited Airlines

Deal found 9/15

$298

Wed 10/2212:59 amDEN - IAD

1 stop12h 39mFrontier

Wed 10/298:47 amIAD - DEN

1 stop6h 58mFrontier

Deal found 9/13

$160

Fri 10/2412:59 amDEN - IAD

1 stop12h 18mFrontier

Wed 10/298:47 amIAD - DEN

1 stop6h 58mFrontier

Deal found 9/13

$150

Wed 10/292:00 pmDEN - IAD

1 stop28h 57mFrontier

Thu 11/69:52 pmIAD - DEN

1 stop12h 51mFrontier

Deal found 9/15

$159

Wed 10/2912:34 amDEN - IAD

1 stop12h 32mFrontier

Wed 11/58:40 amIAD - DEN

1 stop7h 05mFrontier

Deal found 9/14

$161

One-way flights from Colorado to Dulles Intl
Search for one-way flight options from Colorado to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated September 15, 2025.

Fri 10/2411:59 pmDEN - IAD

1 stop6h 50mAmerican Airlines

Deal found 9/14

$84

Wed 11/512:45 pmCOS - IAD

1 stop7h 48mAmerican Airlines

Deal found 9/14

$84

Tue 10/2111:59 pmDEN - IAD

1 stop7h 56mAmerican Airlines

Deal found 9/12

$85

Sat 9/279:44 amDEN - IAD

1 stop6h 40mFrontier

Deal found 9/14

$88

Wed 10/2911:59 pmDEN - IAD

Nonstop3h 17mUnited Airlines

Deal found 9/15

$89

Tue 10/216:02 amCOS - IAD

2 stops10h 52mAmerican Airlines

Deal found 9/14

$89

Fri 10/1711:59 pmDEN - IAD

Nonstop3h 23mUnited Airlines

Deal found 9/12

$91

Sun 11/161:36 pmDEN - IAD

1 stop24h 30mMultiple Airlines

Deal found 9/14

$93

Fri 9/269:18 pmDEN - IAD

1 stop12h 44mFrontier

Deal found 9/14

$94

Thu 11/61:36 pmDEN - IAD

1 stop28h 20mMultiple Airlines

Deal found 9/13

$95

Sun 11/91:36 pmDEN - IAD

1 stop27h 30mMultiple Airlines

Deal found 9/14

$98

Sat 10/187:21 amDEN - IAD

1 stop7h 26mAmerican Airlines

Deal found 9/13

$99

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sun 10/19

11:59 pm-7:14 pm

1 stop17h 15m

Washington, D.C. Dulles Intl

Tue 10/28

8:47 am-1:45 pm

1 stop6h 58m

$155

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Fri 10/24

1:42 pm-11:29 pm

1 stop7h 47m

Washington, D.C. Dulles Intl

Sun 10/26

8:02 pm-11:16 pm

1 stop29h 14m

$157

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Fri 10/17

12:36 am-8:53 pm

1 stop18h 17m

Washington, D.C. Dulles Intl

Mon 10/27

5:00 pm-9:26 pm

1 stop6h 26m

$157

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Sat 11/1

12:09 pm-9:31 pm

1 stop7h 22m

Washington, D.C. Dulles Intl

Wed 11/5

6:04 am-11:48 am

1 stop7h 44m

$167

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 10/8

12:34 am-2:25 pm

1 stop11h 51m

Washington, D.C. Dulles Intl

Sun 10/12

7:27 pm-11:16 pm

1 stop29h 49m

$168

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sat 10/18

5:40 pm-11:00 pm

Nonstop3h 20m

Washington, D.C. Dulles Intl

Sat 10/25

6:40 am-8:30 am

Nonstop3h 50m

$177

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 11/5

10:30 am-3:45 pm

Nonstop3h 15m

Washington, D.C. Dulles Intl

Wed 11/12

7:40 am-9:30 am

Nonstop3h 50m

$177

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 10/16

11:59 pm-5:22 am

Nonstop3h 23m

Washington, D.C. Dulles Intl

Wed 10/22

10:09 pm-11:57 pm

Nonstop3h 48m

$197

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Mon 10/27

11:59 pm-5:16 am

Nonstop3h 17m

Washington, D.C. Dulles Intl

Wed 10/29

10:10 pm-12:15 am

Nonstop4h 05m

$197

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 12/4

10:30 am-3:45 pm

Nonstop3h 15m

Washington, D.C. Dulles Intl

Sat 12/6

3:55 pm-5:50 pm

Nonstop3h 55m

$197

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results

...

Best time to book a flight from Colorado to Dulles Intl

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

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

Currently, August is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $292). Flying from Colorado to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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 CO to IAD?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Washington, D.C. Dulles Intl Airport as you normally would.

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

The most flights from USCO to IAD are scheduled on a Monday (26 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (21 on average).

Related info for your journey

How long is the flight from Colorado to Washington, D.C. Dulles Intl Airport?
Frontier, American Airlines, and Southwest can get you from Colorado to Washington, D.C. Dulles Intl Airport in just under 3h 20m. Your travel time can differ by up to 13h 55m. The distance between Colorado and Washington, D.C. Dulles Intl Airport is about 1448 mi. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines to fly from Colorado to Washington, D.C. Dulles Intl Airport one-way?
The cheapest airlines for a one-way flight from Colorado to Washington, D.C. Dulles Intl Airport are American Airlines ($84), Frontier ($88), and United Airlines ($89).
What are the most popular routes from Colorado to Washington, D.C. Dulles Intl Airport?
The most popular route from Colorado to Washington, D.C. Dulles Intl Airport is Denver Intl - Washington, D.C. Dulles Intl. You may also consider Colorado Springs - Washington, D.C. Dulles Intl or Vail Eagle County - Washington, D.C. Dulles Intl.
What are the most reliable airlines from Colorado to Washington, D.C. Dulles Intl Airport?
Consider Avianca (92%), Brussels Airlines (78%) or United Airlines (76%) when booking your flight. These represent the most reliable airlines when flying from Colorado to Washington, D.C. Dulles Intl Airport.
What are the cheapest flights from Colorado to Washington, D.C. Dulles Intl Airport?
Looking at all options, your cheapest flight can be booked for $108. While the most popular route (Denver Intl - Washington, D.C. Dulles Intl) can be booked for $162 on average, our data indicates $1,314 when flying from Colorado to Washington, D.C. Dulles Intl Airport.
Can I find deals for flights from Colorado to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Colorado to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Colorado to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to Dulles Intl.
Can I find deals for business class flights from Colorado to Dulles Intl?
Yes. Cheapflights offers flight deals from Colorado to Dulles Intl 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 Colorado to Washington, D.C. Dulles Intl Airport?
Currently, August is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $292). Flying from Colorado to Washington, D.C. Dulles Intl Airport in April is currently the most expensive (average of $337). 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.

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Top 5 airlines flying from Colorado to Dulles Intl

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$118	Average$243	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$148	Average$332	FlexibilityNo cancel fee	On-timeN/A
Southwest	Cheapest$177	Average$350	FlexibilityNo cancel fee	On-time63%
United Airlines	Cheapest$216	Average$509	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$288	Average$425	FlexibilityNo cancel fee	On-time71%

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$84+ Cheap flights from Colorado to Dulles Intl (IAD)

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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Colorado to Dulles Intl with Cheapflights

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Cheap flight deals from Colorado to Dulles Intl

Keep the following information in mind while searching for Colorado to Dulles Intl flight deals. Data was last updated September 15, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Colorado to Dulles Intl

Cheapest flights from Colorado to Dulles IntlExplore the most affordable flight options available from Colorado to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

Explore the most affordable flight options available from Colorado to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Colorado to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Colorado with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Colorado to Washington, D.C. Dulles Intl Airport

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

What is the cheapest time of day to fly from CO to IAD?

Find hourly flight availability from Colorado to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

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

Related info for your journey

Find useful and relevant information for your journey from Colorado to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

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

What are the most popular routes from Colorado to Washington, D.C. Dulles Intl Airport?

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

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

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

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

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

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

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

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Alternative routes for Colorado to Dulles Intl

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Top 5 airlines flying from Colorado to Dulles Intl

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Cheapest flights from Colorado to Dulles Intl
Explore the most affordable flight options available from Colorado to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.