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Dulles Intl

$69+ 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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — IAD
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
1 adult, Economy
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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 November 13, 2025.

This CheapOair deal was found by Cheapflights users on 11/12. 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 12/1111:59 pmDEN - IAD
1 stop18h 25mFrontier
Mon 12/154:00 pmIAD - DEN
1 stop18h 43mFrontier
Deal found 11/12$130
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3112:14 amDEN - IAD
1 stop16h 02mFrontier
Mon 1/57:06 pmIAD - DEN
1 stop19h 15mFrontier
Deal found 11/11$131
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/41:42 pmDEN - IAD
1 stop7h 28mFrontier
Thu 12/117:18 pmIAD - DEN
1 stop28h 20mFrontier
Deal found 11/11$133
This Expedia deal was found by Cheapflights users on 11/12. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/121:42 pmDEN - IAD
1 stop7h 23mFrontier
Mon 12/154:00 pmIAD - DEN
1 stop18h 43mFrontier
Deal found 11/12$134
This CheapOair deal was found by Cheapflights users on 11/11. 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 12/1111:00 pmDEN - IAD
1 stop7h 31mFrontier
Thu 12/189:41 amIAD - DEN
1 stop25h 15mFrontier
Deal found 11/11$137
This CheapOair deal was found by Cheapflights users on 11/12. 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 12/411:25 pmDEN - IAD
1 stop13h 40mFrontier
Sun 12/79:21 amIAD - DEN
1 stop25h 49mFrontier
Deal found 11/12$138
This CheapOair deal was found by Cheapflights users on 11/12. 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 12/711:00 pmDEN - IAD
1 stop7h 31mFrontier
Mon 12/84:00 pmIAD - DEN
1 stop18h 43mFrontier
Deal found 11/12$142
This Super.com deal was found by Cheapflights users on 11/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2511:14 pmDEN - IAD
1 stop10h 38mFrontier
Thu 11/276:55 amIAD - DEN
1 stop7h 34mFrontier
Deal found 11/11$143
This CheapOair deal was found by Cheapflights users on 11/11. 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.
Wed 11/266:08 pmDEN - IAD
1 stop14h 09mFrontier
Mon 12/112:47 pmIAD - DEN
1 stop22h 21mFrontier
Deal found 11/11$144
This CheapOair deal was found by Cheapflights users on 11/12. 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.
Wed 11/269:19 amDEN - IAD
1 stop22h 58mFrontier
Sun 12/79:20 pmIAD - DEN
1 stop27h 44mFrontier
Deal found 11/12$145
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/912:59 amDEN - IAD
1 stop11h 30mFrontier
Thu 12/117:18 pmIAD - DEN
1 stop15h 44mFrontier
Deal found 11/11$146
This Kiwi.com deal was found by Cheapflights users on 11/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3112:14 amDEN - IAD
1 stop16h 02mFrontier
Wed 1/75:42 pmIAD - DEN
1 stop29h 56mFrontier
Deal found 11/13$148

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 November 13, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$129
(Kiwi.com)

One-way from

$69
(CheapOair)

Popular in

December

Cheapest in

January

Average price

$302

Good round-trip deal

$347 or less

Good one-way deal

$148 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
Search Deals
One-way flight from Colorado to Washington, D.C. Dulles Intl
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($18 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 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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Cheapflights Fare Finder

 
Customize your flight search to find flights from Colorado to Dulles Intl 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 November 13, 2025.
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

Colorado

Fly to

Dulles Intl

Route

Depart

Return

Price

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 1/21

10:35 am-3:50 pm

Nonstop3h 15m

Washington, D.C. Dulles Intl

Sun 1/25

5:40 pm-7:55 pm

Nonstop4h 15m

$197

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Mon 1/26

12:30 am-9:16 am

1 stop6h 46m

Washington, D.C. Dulles Intl

Sat 1/31

6:00 am-10:10 am

1 stop6h 10m

$217

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 12/11

4:44 pm-12:12 am

1 stop5h 28m

Washington, D.C. Dulles Intl

Wed 12/17

6:03 am-12:53 pm

1 stop8h 50m

$227

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Fri 12/12

11:59 pm-5:16 am

Nonstop3h 17m

Washington, D.C. Dulles Intl

Sun 12/14

10:10 pm-12:15 am

Nonstop4h 05m

$237

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 2/4

12:30 am-9:16 am

1 stop6h 46m

Washington, D.C. Dulles Intl

Mon 2/9

7:00 am-2:02 pm

1 stop9h 02m

$237

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Fri 1/30

3:07 pm-11:06 pm

1 stop5h 59m

Washington, D.C. Dulles Intl

Sun 2/1

6:00 am-10:10 am

1 stop6h 10m

$237

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 1/22

12:30 am-9:16 am

1 stop6h 46m

Washington, D.C. Dulles Intl

Sun 1/25

6:00 am-10:10 am

1 stop6h 10m

$237

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Fri 2/6

1:16 pm-8:47 pm

1 stop5h 31m

Washington, D.C. Dulles Intl

Mon 2/9

7:00 am-2:02 pm

1 stop9h 02m

$237

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Fri 2/13

5:50 pm-11:10 pm

Nonstop3h 20m

Washington, D.C. Dulles Intl

Tue 2/17

4:40 pm-10:50 pm

1 stop8h 10m

$247

HaydenWashington, D.C.

HDN - IAD

HDNIAD

Hayden Yampa Valley

Fri 12/5

7:00 am-4:30 pm

1 stop7h 30m

Washington, D.C. Dulles Intl

Sun 12/7

2:30 pm-8:08 pm

1 stop7h 38m

$249

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/13

Showing 1-10 of 60 results
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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
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, January is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $136). Flying from Colorado to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $236). 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?

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 November 13, 2025.

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 afternoon tend to be the most expensive. A flight at noon could potentially save you up to 7% on airfare.

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

Use this chart to determine the cheapest time to fly round-trip from Colorado to Dulles Intl. Price data was last updated on December 16, 2024.

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

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

Explore weekly flight availability from Colorado to Dulles Intl. 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 November 13, 2025.

The most flights from USCO to IAD are scheduled on a Thursday (26 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 on average).

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?

    Southwest, Delta, and United Airlines can get you from Colorado to Washington, D.C. Dulles Intl Airport in just under 3h 15m. Your travel time can differ by up to 3h 31m. 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 United Airlines ($89), Southwest ($89), and Delta ($119).

  • 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 ITA Airways (100%), Ethiopian Air (100%) or Avianca (97%) 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 $70. While the most popular route (Denver Intl - Washington, D.C. Dulles Intl) can be booked for $163 on average, our data indicates $1,155 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 $136). Flying from Colorado to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $236). 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
Tysons
Woodbridge
Arlington
Owings Mills
Springfield
Hanover
Silver Spring
Fairfax
Fredericksburg
Falls Church
Linthicum Heights
Manassas
Laurel
Towson
National Harbor
Waldorf
Bowie
Largo
McLean

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Alternative routes for Colorado to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Fort Lauderdale to Dulles Intl flights
Austin to Reagan-National flights
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Top 5 airlines flying from Colorado to Dulles Intl

Discover the top 5 airlines that operate flights from Colorado to Dulles Intl. 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 November 13, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$116Average$238FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$177Average$341FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$216Average$496FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$262FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$288Average$430FlexibilityNo cancel feeOn-time71%

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