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Dulles Intl

$79+ 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — IAD
May 10 — May 171
Sun 5/10
Sun 5/17
1 adult, Economy
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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 April 10, 2026.

This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/1411:59 pm
DEN
-
IAD
1 stop13h 15m
Frontier
Mon 5/186:17 pm
IAD
-
DEN
1 stop30h 07m
Frontier
Deal found 4/6$179
This Kiwi.com deal was found by Cheapflights users on 4/5. 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.
Wed 5/2711:54 pm
DEN
-
IAD
1 stop8h 18m
Frontier
Thu 5/288:47 pm
IAD
-
DEN
1 stop14h 18m
Frontier
Deal found 4/5$184
This Frontier deal was found by Cheapflights users on 4/5. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/1111:54 pm
DEN
-
IAD
1 stop8h 18m
Frontier
Mon 5/183:59 pm
IAD
-
DEN
1 stop8h 40m
Frontier
Deal found 4/5$185
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/411:59 pm
DEN
-
IAD
1 stop8h 13m
Frontier
Fri 5/87:27 pm
IAD
-
DEN
2 stops22h 01m
Frontier
Deal found 4/6$187
This Kiwi.com deal was found by Cheapflights users on 4/8. 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 5/2611:54 pm
DEN
-
IAD
1 stop8h 18m
Frontier
Fri 5/298:47 pm
IAD
-
DEN
1 stop14h 18m
Frontier
Deal found 4/8$189
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/166:30 am
DEN
-
IAD
1 stop7h 51m
Frontier
Mon 5/186:17 pm
IAD
-
DEN
2 stops16h 55m
Frontier
Deal found 4/6$190
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 5/411:59 pm
DEN
-
IAD
1 stop8h 13m
Frontier
Sat 5/96:49 am
IAD
-
DEN
2 stops17h 50m
Frontier
Deal found 4/9$191
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 6/111:59 pm
DEN
-
IAD
2 stops21h 10m
Frontier
Sat 6/68:47 pm
IAD
-
DEN
1 stop14h 18m
Frontier
Deal found 4/9$192
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 5/286:30 am
DEN
-
IAD
1 stop7h 51m
Frontier
Thu 6/48:47 pm
IAD
-
DEN
2 stops44h 53m
Frontier
Deal found 4/9$193
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/2711:54 pm
DEN
-
IAD
1 stop8h 18m
Frontier
Fri 5/297:45 am
IAD
-
DEN
1 stop8h 19m
Frontier
Deal found 4/6$194
This American Airlines deal was found by Cheapflights users on 4/9. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/712:42 pm
MTJ
-
IAD
1 stop8h 44m
American Airlines
Tue 5/197:00 am
IAD
-
MTJ
1 stop7h 02m
American Airlines
Deal found 4/9$309
This Southwest deal was found by Cheapflights users on 4/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/124:05 pm
COS
-
IAD
1 stop5h 35m
Southwest
Tue 5/196:20 am
IAD
-
COS
1 stop5h 25m
Southwest
Deal found 4/6$335

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 April 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$179
(Kiwi.com)

One-way from

$79
(Super.com)

Popular in

March

Cheapest in

January

Average price

$285

Good round-trip deal

$433 or less

Good one-way deal

$231 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. 3% potential increase in price ($9 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 10, 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 - IAD

DENIAD

Denver Intl

Sat 5/2

5:35 pm-10:55 pm

Nonstop3h 20m

Washington, D.C. Dulles Intl

Sat 5/9

3:55 pm-10:20 pm

1 stop8h 25m

$267

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 5/13

6:45 am-3:50 pm

1 stop7h 05m

Washington, D.C. Dulles Intl

Tue 5/19

6:20 am-8:10 am

Nonstop3h 50m

$287

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 5/7

4:41 pm-12:51 am

1 stop6h 10m

Washington, D.C. Dulles Intl

Tue 5/19

11:15 am-5:14 pm

1 stop7h 59m

$297
Quickest round-trip

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sat 5/9

11:10 am-4:25 pm

Nonstop3h 15m

Washington, D.C. Dulles Intl

Sat 5/16

5:50 am-7:40 am

Nonstop3h 50m

$297

MontroseWashington, D.C.

MTJ - IAD

MTJIAD

Montrose County

Thu 5/7

12:42 pm-11:26 pm

1 stop8h 44m

Washington, D.C. Dulles Intl

Tue 5/19

7:00 am-12:02 pm

1 stop7h 02m

$309

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 4/30

7:05 pm-12:20 am

Nonstop3h 15m

Washington, D.C. Dulles Intl

Sun 5/3

5:50 am-7:40 am

Nonstop3h 50m

$317

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 4/30

3:30 pm-12:42 am

1 stop7h 12m

Washington, D.C. Dulles Intl

Sun 5/3

6:00 am-10:34 am

1 stop6h 34m

$337

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 4/30

7:05 pm-12:20 am

Nonstop3h 15m

Washington, D.C. Dulles Intl

Mon 5/4

5:55 pm-8:00 pm

Nonstop4h 05m

$337

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Tue 6/2

1:55 pm-9:24 pm

1 stop5h 29m

Washington, D.C. Dulles Intl

Mon 6/8

6:00 am-10:30 am

1 stop6h 30m

$351

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sat 5/23

11:10 am-4:25 pm

Nonstop3h 15m

Washington, D.C. Dulles Intl

Tue 5/26

6:20 am-8:10 am

Nonstop3h 50m

$355

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/5

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
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, November is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $160). Flying from Colorado to Washington, D.C. Dulles Intl Airport in May is currently the most expensive (average of $252). 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 April 10, 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 morning could potentially save you up to 21% 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 April 4, 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.

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 April 10, 2026.

The most flights from USCO to IAD are scheduled on a Monday (25 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (20 on average).

How much does it cost to fly round-trip 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?

    Southwest, Delta, and American Airlines 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 5h 24m. 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 ($88), and United Airlines ($109).

  • 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%), Ethiopian Air (93%) or ITA Airways (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 $148. While the most popular route (Denver Intl - Washington, D.C. Dulles Intl) can be booked for $185 on average, our data indicates $983 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, November is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $160). Flying from Colorado to Washington, D.C. Dulles Intl Airport in May is currently the most expensive (average of $252). 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
Woodbridge
Tysons
Owings Mills
Springfield
Arlington
Silver Spring
Herndon
Hyattsville
Hanover
Laurel
Rockville
Upper Marlboro
Largo
Bowie
Clinton
Towson
Cordova
Manassas
Falls Church

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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.
Dallas/Fort Worth to Dulles Intl flights
Dallas/Fort Worth to Baltimore flights
Los Angeles to Reagan-National flights
Seattle to Dulles Intl flights
Dallas/Fort Worth to Reagan-National flights
Los Angeles to Baltimore flights
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Atlanta to Dulles Intl flights
Boston to Dulles Intl flights
San Francisco to Dulles Intl flights
O'Hare Intl to Baltimore flights
Seattle to Reagan-National flights
Atlanta to Reagan-National flights
O'Hare Intl to Reagan-National flights
Hobby to Reagan-National flights
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Hobby to Dulles Intl flights
Atlanta to Baltimore flights
San Francisco to Reagan-National flights
Boston to Reagan-National flights
O'Hare Intl to Dulles Intl flights
Minneapolis to Dulles Intl flights
Orlando to Dulles Intl flights
Minneapolis to Reagan-National flights
Boston to Baltimore flights
San Francisco to Baltimore flights
Denver to Baltimore flights
John F Kennedy Intl to Dulles Intl flights
George Bush Intcntl to Dulles Intl flights
Detroit to Dulles Intl flights
Sky Harbor Intl to Dulles Intl flights
George Bush Intcntl to Reagan-National flights
Minneapolis to Baltimore flights
Hobby to Baltimore flights
Miami to Reagan-National flights
Tampa to Dulles Intl flights
Orlando to Reagan-National flights
Denver to Reagan-National flights
Sky Harbor Intl to Baltimore flights
Seattle to Baltimore flights
Tampa to Reagan-National flights
Detroit to Reagan-National flights
Austin to Dulles Intl flights
Midway to Baltimore flights
Portland to Dulles Intl flights
Orlando to Baltimore flights
Miami to Dulles Intl flights
Sky Harbor Intl to Reagan-National flights
Newark to Dulles Intl flights
Detroit to Baltimore flights

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 April 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$111Average$267FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$177Average$331FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$203Average$470FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$262FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$288Average$375FlexibilityNo cancel feeOn-time71%

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