HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Dulles Intl

$128+ 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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — IAD
Sep 5 — Sep 121
Sat 9/5
Sat 9/12
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Colorado to Dulles Intl with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap 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 August 6, 2026.

This Kiwi.com deal was found by Cheapflights users on 8/4. 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.
Sun 10/187:34 pm -
1 stop14h 33m
Sat 10/247:00 am -
1 stop9h 00m
Deal found 8/4$229
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 11/116:30 am -
1 stop9h 06m
Sun 11/159:16 pm -
1 stop27h 17m
Deal found 8/3$230
This Kiwi.com deal was found by Cheapflights users on 8/3. 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.
Mon 9/1410:44 am -
1 stop11h 26m
Thu 9/179:04 pm -
2 stops37h 06m
Deal found 8/3$231
This Kiwi.com deal was found by Cheapflights users on 8/5. 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.
Sat 8/2911:59 pm -
1 stop9h 44m
Mon 8/318:59 am -
1 stop17h 11m
Deal found 8/5$232
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 8/276:10 am -
1 stop23h 54m
Sat 8/298:59 am -
1 stop14h 42m
Deal found 8/4$233
This Kiwi.com deal was found by Cheapflights users on 8/5. 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.
Sat 9/1910:44 am -
1 stop11h 26m
Tue 9/229:04 pm -
1 stop13h 00m
Deal found 8/5$234
This Kiwi.com deal was found by Cheapflights users on 8/4. 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 8/2611:59 pm -
1 stop9h 44m
Sun 8/308:59 am -
1 stop20h 49m
Deal found 8/4$235
This Super.com deal was found by Cheapflights users on 8/5. 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.
Thu 9/36:30 am -
1 stop8h 44m
Sun 9/64:52 pm -
1 stop8h 08m
Deal found 8/5$236
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 8/2511:59 pm -
1 stop20h 53m
Fri 8/287:24 pm -
1 stop6h 51m
Deal found 8/3$237
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Fri 9/259:19 pm -
1 stop12h 14m
Wed 9/307:50 am -
1 stop15h 13m
Deal found 8/1$238
This Kiwi.com deal was found by Cheapflights users on 8/1. 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.
Mon 8/316:30 am -
1 stop8h 44m
Mon 9/79:44 pm -
2 stops26h 21m
Deal found 8/1$239
This Frontier deal was found by Cheapflights users on 8/1. 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.
Fri 9/46:30 am -
1 stop8h 44m
Tue 9/88:59 am -
1 stop11h 01m
Deal found 8/1$240

Find 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 August 6, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$229
(Kiwi.com)

One-way from

$128
(Super.com)

Popular in

June

Cheapest in

January

Average price

$304

Good round-trip deal

$428 or less

Good one-way deal

$287 or less
Provider with most accurate pricing for Denver Intl-Washington, D.C. (WAS) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Denver Intl-Washington, D.C. (WAS) flights.
Search Deals
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. 23% potential increase in price ($98 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($12 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a round-trip flight from Colorado to Washington, D.C. Dulles Intl.
Search Deals
Price to beat on a one-way flight from Colorado to Washington, D.C. Dulles Intl.
Search Deals

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 August 6, 2026.
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

DenverWashington, D.C.

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

DENIAD

Denver Intl

Sat 9/12

3:40 pm-9:08 pm

Nonstop3h 28m

Washington, D.C. Dulles Intl

Sun 9/20

10:10 am-12:01 pm

Nonstop3h 51m

$319

DenverWashington, D.C.

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

DENIAD

Denver Intl

Fri 9/4

3:40 pm-9:08 pm

Nonstop3h 28m

Washington, D.C. Dulles Intl

Mon 9/7

7:20 pm-9:16 pm

Nonstop3h 56m

$319

DenverWashington, D.C.

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

DENIAD

Denver Intl

Thu 9/3

12:22 pm-5:50 pm

Nonstop3h 28m

Washington, D.C. Dulles Intl

Mon 9/7

6:30 am-8:24 am

Nonstop3h 54m

$319

DenverWashington, D.C.

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

DENIAD

Denver Intl

Sat 10/3

1:58 pm-7:26 pm

Nonstop3h 28m

Washington, D.C. Dulles Intl

Sat 10/10

5:27 pm-7:30 pm

Nonstop4h 03m

$319

DenverWashington, D.C.

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

DENIAD

Denver Intl

Thu 10/22

8:00 am-1:30 pm

Nonstop3h 30m

Washington, D.C. Dulles Intl

Tue 10/27

8:20 am-10:29 am

Nonstop4h 09m

$319

DenverWashington, D.C.

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

DENIAD

Denver Intl

Tue 9/8

11:59 pm-5:25 am

Nonstop3h 26m

Washington, D.C. Dulles Intl

Wed 9/23

10:34 pm-12:30 am

Nonstop3h 56m

$319

DenverWashington, D.C.

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

DENIAD

Denver Intl

Thu 9/24

6:30 am-4:30 pm

1 stop8h 00m

Washington, D.C. Dulles Intl

Mon 9/28

7:17 pm-11:14 pm

1 stop5h 57m

$339

DurangoWashington, D.C.

DRO Durango La Plata County - IAD Washington, D.C. Dulles Intl

DROIAD

Durango La Plata County

Fri 11/13

12:58 pm-11:19 pm

1 stop8h 21m

Washington, D.C. Dulles Intl

Wed 11/18

7:14 am-12:28 pm

1 stop7h 14m

$348

DurangoWashington, D.C.

DRO Durango La Plata County - IAD Washington, D.C. Dulles Intl

DROIAD

Durango La Plata County

Tue 9/1

1:34 pm-9:08 pm

1 stop5h 34m

Washington, D.C. Dulles Intl

Mon 9/7

6:30 am-12:32 pm

1 stop8h 02m

$348

Colorado SpringsWashington, D.C.

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

COSIAD

Colorado Springs

Sat 9/5

11:27 am-12:34 am

2 stops11h 07m

Washington, D.C. Dulles Intl

Fri 9/11

8:08 am-12:14 pm

1 stop6h 06m

$360

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/5

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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, October is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $324). Flying from Colorado to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $548). 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 August 6, 2026.

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 29% on airfare.

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 $317 and $561 in October.
The cheapest round-trip price found within the last 5 days was $229 on Multiple Airlines (Oct 18-Oct 24).

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

Booking 79 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?

Use this chart to determine the cheapest time to fly round-trip from Colorado to Dulles Intl. Price data was last updated on August 1, 2026.

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. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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?

    United Airlines, American Airlines, and Delta can get you from Colorado to Washington, D.C. Dulles Intl Airport in just under 3h 28m. Your travel time can differ by up to 7h 39m. 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 ($76), Southwest ($78), and United Airlines ($116).

  • 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 Grand Junction Regnl - Washington, D.C. Dulles Intl.

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

    Consider Avianca (93%), ITA Airways (92%) or Ethiopian Air (90%) 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 $192. While the most popular route (Denver Intl - Washington, D.C. Dulles Intl) can be booked for $273 on average, our data indicates $1,021 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, October is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $324). Flying from Colorado to Washington, D.C. Dulles Intl Airport in July is currently the most expensive (average of $548). 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
Owings Mills
Arlington
Tysons
Springfield
Lanham
Reston
Herndon
Rockville
Chantilly
Hyattsville
Fredericksburg
Falls Church
Hanover
Laurel
Sterling
Clinton
Oxon Hill
Hunt Valley
Woodbridge

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Colorado to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Dallas/Fort Worth to Dulles Intl flights
Dallas/Fort Worth to Baltimore flights
Dallas/Fort Worth to Reagan-National flights
Boston to Baltimore flights
O'Hare Intl to Dulles Intl flights
Hobby to Baltimore flights
Los Angeles to Reagan-National flights
Los Angeles to Baltimore flights
Atlanta to Baltimore flights
Atlanta to Dulles Intl flights
O'Hare Intl to Reagan-National flights
Atlanta to Reagan-National flights
San Francisco to Dulles Intl flights
Seattle to Reagan-National flights
Hobby to Reagan-National flights
Boston to Reagan-National flights
O'Hare Intl to Baltimore flights
Seattle to Dulles Intl flights
Orlando to Reagan-National flights
Hobby to Dulles Intl flights
San Francisco to Reagan-National flights
San Francisco to Baltimore flights
Boston to Dulles Intl flights
Orlando to Dulles Intl flights
Fort Lauderdale to Baltimore flights
Minneapolis to Dulles Intl flights
Los Angeles to Dulles Intl flights
Charlotte to Dulles Intl flights
Minneapolis to Reagan-National flights
Tampa to Baltimore flights
Tampa to Dulles Intl flights
George Bush Intcntl to Dulles Intl flights
Tampa to Reagan-National flights
John F Kennedy Intl to Dulles Intl flights
Orlando to Baltimore flights
Denver to Baltimore flights
George Bush Intcntl to Baltimore flights
George Bush Intcntl to Reagan-National flights
Denver to Dulles Intl flights
Minneapolis to Baltimore flights
Ontario to Dulles Intl flights
Charlotte to Baltimore flights
Seattle to Baltimore flights
Miami to Reagan-National flights
San Diego to Dulles Intl flights
Detroit to Baltimore flights
Midway to Dulles Intl flights
Austin to Dulles Intl flights
Fort Lauderdale to Dulles Intl flights
Detroit to Reagan-National flights

Top 4 airlines flying from Colorado to Dulles Intl

Discover the top 4 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 August 6, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$133Average$299FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$188Average$364FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$217Average$473FlexibilityNo cancel feeOn-time69%
DeltaCheapest$292Average$471FlexibilityNo cancel feeOn-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.