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Dulles Intl

$156+ Cheap flights from Colorado to Dulles Intl (IAD)

DEN — IAD
Dec 9 — Dec 161
Wed 12/9
Wed 12/16
1 adult, Economy
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Cheap flight deals from Colorado to Dulles Intl

Cheapest flights from Colorado to Dulles Intl

Fri 11/206:58 pm -
1 stop16h 27m
Tue 11/242:10 pm -
1 stop7h 27m
Deal found 11/4$298
Tue 12/226:25 am -
1 stop11h 09m
Mon 1/410:28 pm -
1 stop12h 56m
Deal found 11/7$299
Sat 11/149:20 pm -
1 stop12h 16m
Wed 11/1812:31 pm -
1 stop11h 03m
Deal found 11/4$300
Tue 12/18:07 pm -
1 stop13h 04m
Thu 12/311:18 am -
1 stop7h 47m
Deal found 11/9$301
Thu 12/38:46 pm -
2 stops16h 03m
Sun 12/68:55 pm -
1 stop13h 55m
Deal found 11/5$302
Thu 11/197:10 pm -
1 stop23h 30m
Thu 11/261:09 pm -
1 stop22h 34m
Deal found 11/5$303
Mon 11/303:52 pm -
1 stop16h 13m
Thu 12/310:22 pm -
2 stops25h 07m
Deal found 11/6$304
Wed 11/1810:41 am -
1 stop11h 02m
Thu 11/199:06 pm -
1 stop11h 30m
Deal found 11/4$305
Mon 11/3011:59 pm -
2 stops12h 50m
Sat 12/53:34 pm -
2 stops19h 16m
Deal found 11/6$306
Fri 11/206:20 am -
1 stop12h 41m
Fri 11/271:09 pm -
1 stop13h 45m
Deal found 11/5$308
Wed 11/257:50 pm -
1 stop7h 20m
Mon 11/309:35 pm -
1 stop20h 01m
Deal found 11/5$309
Mon 12/76:10 pm -
2 stops18h 39m
Thu 12/103:08 pm -
1 stop28h 12m
Deal found 11/9$348

Find flight deals from Colorado to Dulles Intl

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$297
(Travelocity)

One-way from

$156
(Mytrip)

Popular in

November

Cheapest in

January

Average price

$448

Good round-trip deal

$547 or less

Good one-way deal

$334 or less
Provider with most accurate pricing for Denver Intl-Washington, D.C. (WAS) flight deals.
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Provider most trusted by Cheapflights users for Denver Intl-Washington, D.C. (WAS) flights.
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From Colorado to Washington, D.C. Dulles Intl
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One-way flight from Colorado to Washington, D.C. Dulles Intl
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Highest demand for flights based on searches. 10% potential increase in price ($40 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 November 2026
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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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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

Cheapest round-trip

MontroseWashington, D.C.

MTJ Montrose County - IAD Washington, D.C. Dulles Intl

MTJIAD

Montrose County

Wed 1/27

3:35 pm-11:26 pm

1 stop5h 51m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$193

Colorado SpringsWashington, D.C.

COS Colorado Springs - IAD Washington, D.C. Dulles Intl

COSIAD

Colorado Springs

Wed 12/16

8:02 am-8:11 pm

2 stops10h 09m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$202

Colorado SpringsWashington, D.C.

COS Colorado Springs - IAD Washington, D.C. Dulles Intl

COSIAD

Colorado Springs

Thu 12/31

8:00 am-4:03 pm

1 stop6h 03m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$205

MontroseWashington, D.C.

MTJ Montrose County - IAD Washington, D.C. Dulles Intl

MTJIAD

Montrose County

Thu 1/28

12:29 pm-9:18 pm

1 stop6h 49m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$206
Quickest round-trip

DenverWashington, D.C.

DEN Denver Intl - IAD Washington, D.C. Dulles Intl

DENIAD

Denver Intl

Sun 12/13

4:11 pm-9:24 pm

Nonstop3h 13m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$229

Colorado SpringsWashington, D.C.

COS Colorado Springs - IAD Washington, D.C. Dulles Intl

COSIAD

Colorado Springs

Wed 5/5

11:55 am-10:36 pm

1 stop8h 41m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$231

Colorado SpringsWashington, D.C.

COS Colorado Springs - IAD Washington, D.C. Dulles Intl

COSIAD

Colorado Springs

Wed 12/9

12:10 pm-8:49 pm

1 stop6h 39m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$252

Colorado SpringsWashington, D.C.

COS Colorado Springs - IAD Washington, D.C. Dulles Intl

COSIAD

Colorado Springs

Thu 12/10

11:34 am-2:49 pm

3 stops25h 15m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$260

Colorado SpringsWashington, D.C.

COS Colorado Springs - IAD Washington, D.C. Dulles Intl

COSIAD

Colorado Springs

Wed 5/5

5:55 pm-9:11 am

2 stops13h 16m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$270

AspenWashington, D.C.

ASE Aspen Pitkin County - IAD Washington, D.C. Dulles Intl

ASEIAD

Aspen Pitkin County

Tue 3/16

12:15 pm-9:05 pm

1 stop6h 50m

Washington, D.C. Dulles Intl

Wed 12/31

12:00 am-10:00 pm

Nonstop0h 00m

$278

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Showing 1-10 of 60 resultsSorted by cheapest first
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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

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, January is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $368). Flying from Colorado to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $557). 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?

One of the essential ways to save on airfare from Colorado to Washington, D.C. Dulles Intl Airport is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the afternoon could potentially save you up to 35% on airfare.

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

The most flights from USCO to IAD are scheduled on a Sunday (24 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (16 on average).

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

Airfare is below average for this route at the moment.
Colorado to Washington, D.C. Dulles Intl Airport flights typically cost between $409 and $713 in December.
The cheapest round-trip price found within the last 5 days was $297 on Frontier (Dec 23-Jan 4).

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

Booking 75 days in advance of your planned departure date is, on average, the best time to get cheap flights from Colorado to Washington, D.C. Dulles Intl Airport. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

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

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

Related info for your journey

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

    United Airlines and Delta can get you from Colorado to Washington, D.C. Dulles Intl Airport in just under 3h 17m. Your travel time can differ by up to 7h 17m. 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 Frontier ($94), Southwest ($108), and United Airlines ($124).

  • 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 Montrose County - Washington, D.C. Dulles Intl.

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

    Consider Ethiopian Air (100%), ITA Airways (98%) or Avianca (92%) 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 $223. While the most popular route (Denver Intl - Washington, D.C. Dulles Intl) can be booked for $289 on average, our data indicates $1,149 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, January is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $368). Flying from Colorado to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $557). 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
Alexandria
Chantilly
Woodbridge
Arlington
Sterling
Lanham
Reston
Herndon
Hyattsville
Springfield
Fredericksburg
Falls Church
Towson
Silver Spring
Rockville
Oxon Hill
Laurel
Clinton
Hunt Valley
Owings Mills

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Colorado to Dulles Intl

Dallas/Fort Worth to Dulles Intl flights
Boston to Dulles Intl flights
Dallas/Fort Worth to Baltimore flights
Boston to Reagan-National flights
Los Angeles to Reagan-National flights
Boston to Baltimore flights
Los Angeles to Dulles Intl flights
Dallas/Fort Worth to Reagan-National flights
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Hobby to Baltimore flights
Los Angeles to Baltimore flights
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O'Hare Intl to Reagan-National flights
San Francisco to Dulles Intl flights
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Atlanta to Baltimore flights
Miami to Dulles Intl flights
Atlanta to Reagan-National flights
Miami to Reagan-National flights
San Francisco to Baltimore flights
LaGuardia to Reagan-National flights
Hobby to Reagan-National flights
John F Kennedy Intl to Dulles Intl flights
San Francisco to Reagan-National flights
Seattle to Reagan-National flights
John F Kennedy Intl to Reagan-National flights
Orlando to Reagan-National flights
Newark to Reagan-National flights
George Bush Intcntl to Baltimore flights
Miami to Baltimore flights
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Seattle to Dulles Intl flights
Denver to Dulles Intl flights
Fort Lauderdale to Baltimore flights
Tampa to Dulles Intl flights
LaGuardia to Dulles Intl flights
Fort Lauderdale to Reagan-National flights
Denver to Baltimore flights
LaGuardia to Baltimore flights
Minneapolis to Reagan-National flights
Hobby to Dulles Intl flights
San Diego to Dulles Intl flights
Newark to Baltimore flights
Minneapolis to Dulles Intl flights
George Bush Intcntl to Reagan-National flights
Denver to Reagan-National flights
Fort Lauderdale to Dulles Intl flights
Tampa to Reagan-National flights
George Bush Intcntl to Dulles Intl flights

Top 5 airlines flying from Colorado to Dulles Intl

AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$145Average$311FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$208Average$389FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$236Average$509FlexibilityNo cancel feeOn-time69%
DeltaCheapest$292Average$530FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$298Average$397FlexibilityNo cancel feeOn-time71%

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