HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Colorado

$61+ Cheap flights from Dulles Intl (IAD) to Colorado

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 3/25. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
Feb 25 — Mar 41
Tue 2/25
Tue 3/4
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Dulles Intl to Colorado 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 Dulles Intl to Colorado

Keep the following information in mind while searching for Dulles Intl to Colorado flight deals. Data was last updated February 20, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$113
(FlightHub)

One-way from

$61
(Frontier)

Popular in

December

Cheapest in

September

Average price

$259

Good round-trip deal

$346 or less

Good one-way deal

$184 or less
Provider with most accurate pricing for Washington, D.C. (WAS)-Denver Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Washington, D.C. (WAS)-Denver Intl flights.
Search Deals
From Washington, D.C. Dulles Intl to Colorado
Search Deals
One-way flight from Washington, D.C. Dulles Intl to Colorado
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($7 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2025
Search Deals
Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Colorado.
Search Deals
Price to beat on a one-way flight from Washington, D.C. Dulles Intl to Colorado.
Search Deals

Find flight deals from Dulles Intl to Colorado

Cheapest flights from Dulles Intl to Colorado
Explore the most affordable flight options available from Dulles Intl to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2025.

This FlightHub deal was found by Cheapflights users on 2/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/84:37 pmIAD - DEN
1 stop10h 03mFrontier
Wed 4/1611:57 pmDEN - IAD
1 stop6h 39mFrontier
Deal found 2/19$113
This Booking.com deal was found by Cheapflights users on 2/20. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/76:35 amIAD - DEN
1 stop12h 58mMultiple Airlines
Mon 4/712:14 amDEN - IAD
1 stop14h 50mMultiple Airlines
Deal found 2/20$185
This United Airlines deal was found by Cheapflights users on 2/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/88:30 amIAD - DEN
Nonstop3h 58mUnited Airlines
Wed 4/2311:59 pmDEN - IAD
Nonstop3h 23mUnited Airlines
Deal found 2/20$218
This Delta deal was found by Cheapflights users on 2/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/87:35 amIAD - DEN
1 stop7h 25mDelta
Wed 4/233:05 pmDEN - IAD
1 stop6h 21mDelta
Deal found 2/20$237
This Sun Country Air deal was found by Cheapflights users on 2/19. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/1712:37 pmIAD - DEN
1 stop25h 03mSun Country Air
Sun 4/208:00 amDEN - IAD
1 stop24h 43mSun Country Air
Deal found 2/19$255
This Southwest deal was found by Cheapflights users on 2/20. 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 4/226:40 pmIAD - DEN
Nonstop4h 05mSouthwest
Sat 4/265:50 pmDEN - IAD
Nonstop3h 25mSouthwest
Deal found 2/20$263
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Sun 4/65:00 amIAD - DEN
1 stop6h 14mAmerican Airlines
Sun 4/1311:59 pmDEN - IAD
1 stop6h 39mAmerican Airlines
Deal found 2/20$288
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Wed 4/95:13 pmIAD - COS
1 stop8h 33mAmerican Airlines
Wed 4/166:00 amCOS - IAD
1 stop8h 23mAmerican Airlines
Deal found 2/20$289
This United Airlines deal was found by Cheapflights users on 2/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/195:30 pmIAD - COS
1 stop6h 06mUnited Airlines
Sat 4/268:10 amCOS - IAD
1 stop6h 20mUnited Airlines
Deal found 2/20$290
This American Airlines deal was found by Cheapflights users on 2/20. 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.
Tue 3/256:18 amIAD - MTJ
1 stop9h 57mAmerican Airlines
Tue 4/12:46 pmMTJ - IAD
2 stops7h 12mAmerican Airlines
Deal found 2/20$320
This Delta deal was found by Cheapflights users on 2/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/206:00 amIAD - HDN
1 stop8h 44mDelta
Mon 3/241:49 pmHDN - IAD
1 stop8h 39mDelta
Deal found 2/20$341
This Southwest deal was found by Cheapflights users on 2/19. 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.
Mon 3/247:50 pmIAD - COS
1 stop5h 40mSouthwest
Fri 3/281:25 pmCOS - IAD
1 stop9h 20mSouthwest
Deal found 2/19$344

Find flights from Dulles Intl to Colorado within your budget

Customize your flight search to find flights from Dulles Intl to Colorado 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 February 20, 2025.

Fly from

Dulles Intl

Fly to

Colorado

Route

Depart

Return

Price

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 4/8

4:37 pm-12:40 am

1 stop10h 03m

Denver Intl

Wed 4/16

11:57 pm-8:36 am

1 stop6h 39m

$113

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Mon 4/7

6:35 am-5:33 pm

1 stop12h 58m

Denver Intl

Mon 4/7

12:14 am-5:04 pm

1 stop14h 50m

$185

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 4/8

8:30 am-10:28 am

Nonstop3h 58m

Denver Intl

Wed 4/23

11:59 pm-5:22 am

Nonstop3h 23m

$218

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 4/8

7:35 am-1:00 pm

1 stop7h 25m

Denver Intl

Wed 4/23

3:05 pm-11:26 pm

1 stop6h 21m

$237

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 4/17

12:37 pm-11:40 am

1 stop25h 03m

Denver Intl

Sun 4/20

8:00 am-10:43 am

1 stop24h 43m

$255

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 5/1

7:25 am-9:15 am

Nonstop3h 50m

Denver Intl

Sat 5/3

9:50 am-3:15 pm

Nonstop3h 25m

$269

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sun 4/6

5:00 am-9:14 am

1 stop6h 14m

Denver Intl

Sun 4/13

11:59 pm-8:38 am

1 stop6h 39m

$288

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

Wed 4/9

5:13 pm-11:46 pm

1 stop8h 33m

Colorado Springs

Wed 4/16

6:00 am-4:23 pm

1 stop8h 23m

$289

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

Sat 4/19

5:30 pm-9:36 pm

1 stop6h 06m

Colorado Springs

Sat 4/26

8:10 am-4:30 pm

1 stop6h 20m

$290

Washington, D.C.Montrose

IAD - MTJ

IADMTJ

Washington, D.C. Dulles Intl

Tue 3/25

6:18 am-2:15 pm

1 stop9h 57m

Montrose County

Tue 4/1

2:46 pm-11:58 pm

2 stops7h 12m

$320

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/20

Showing 1-10 of 58 results
1
2
3
...
6

Best time to book a flight from Dulles Intl to Colorado

Have a flexible travel schedule? Discover the best time to fly to Colorado from Dulles Intl 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.

Travel insights for flights from Dulles Intl to Colorado

Get recent, data-driven insights about flights from Dulles Intl to Colorado including ideal travel times, pricing trends, and more.

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

Currently, October is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Colorado (average of $197). Flying from Washington, D.C. Dulles Intl Airport to Colorado in March is currently the most expensive (average of $278). 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 IAD to CO?

Find hourly flight availability from Dulles Intl to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 20, 2025.

When flying from Washington, D.C. Dulles Intl Airport to Colorado, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

Explore weekly flight availability from Dulles Intl to Colorado. 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 February 20, 2025.

The most flights from IAD to USCO are scheduled on a Thursday (21 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (12 on average).

Rainfall in Colorado by month

Plan your trip to Colorado by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Colorado ranges from 0.5 - 2.3 inches per month. May is typically the wettest month, when rainfall can reach 2.3 in. January is typically the driest time to visit Colorado when rainfall is around 0.5 in.

Temperature in Colorado by month

Plan your trip to Colorado by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Colorado, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 30.2 F).

Reviews of airlines servicing Colorado

Get insights into the airlines that provide service to Colorado. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Colorado. Reviews last updated February 20, 2025.
Get a feel of what it's like to fly with Southwest, Alaska Airlines and Delta from Washington, D.C. to Colorado by reading reviews from past customers. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Southwest
8.1
Very good
4,411 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Alaska Airlines
8.0
Very good
9,692 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Delta
8.0
Very good
8,220 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Hawaiian Airlines
7.9
Good
2,317 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

United Airlines
7.4
Good
8,766 reviews
Southwest
8.1
Very good
4,411 reviews

Comfort

8.1

Overall

8.1

Crew

8.7

Food

7.1

Boarding

8.2

Entertainment

7.6

Reviews

1 / 20

2.0
Mediocre

Anonymous,Feb 2025

MCO - STL

Cancelled at last minute, SWA unable to assist in formulating alternate plans. Wound up renting a car and driving 13 hours to beat bad weather forecast at home. Not SWA’s fault that there was significant bad weather across the country.

Related info for your journey

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

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

    One-way options have recently been found by users for as low as $61 on Frontier. Other airlines that offer cheap prices include United Airlines from $109 and Sun Country Air from $111 one-way.

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

    The most popular flight routes from Washington, D.C. Dulles Intl Airport to Colorado are Washington, D.C. Dulles Intl - Denver Intl, Washington, D.C. Dulles Intl - Hayden Yampa Valley and Washington, D.C. Dulles Intl - Colorado Springs.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Washington, D.C. Dulles Intl Airport to Colorado on time: Ethiopian Air (84%), Southwest (78%), United Airlines (78%).

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

    While on average a flight from Washington, D.C. Dulles Intl Airport to Colorado is generally $750, our data shows the cheapest flight currently is $128. When looking at the most popular route, (Washington, D.C. Dulles Intl - Denver Intl), you can expect to pay $174 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Dulles Intl to Colorado 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 Washington, D.C. Dulles Intl Airport to Colorado?

    Currently, October is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Colorado (average of $197). Flying from Washington, D.C. Dulles Intl Airport to Colorado in March is currently the most expensive (average of $278). 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

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 Dulles Intl to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
Reagan-National to Miami flights
Dulles Intl to Orlando flights
Dulles Intl to Dallas/Fort Worth flights
Dulles Intl to Las Vegas flights
Reagan-National to Orlando flights
Baltimore to Dallas/Fort Worth flights
Reagan-National to Los Angeles flights
Baltimore to Fort Lauderdale flights
Dulles Intl to Los Angeles flights
Baltimore to Hobby flights
Dulles Intl to Miami flights
Baltimore to Miami flights
Reagan-National to Seattle flights
Baltimore to Las Vegas flights
Baltimore to Los Angeles flights
Baltimore to Orlando flights
Reagan-National to Las Vegas flights
Dulles Intl to O'Hare Intl flights
Dulles Intl to Hobby flights
Dulles Intl to Atlanta flights
Dulles Intl to Sky Harbor Intl flights
Reagan-National to Hobby flights
Baltimore to O'Hare Intl flights
Dulles Intl to Tampa flights
Dulles Intl to Denver flights
Dulles Intl to San Francisco flights
Dulles Intl to New Orleans flights
Reagan-National to O'Hare Intl flights
Reagan-National to Dallas/Fort Worth flights
Reagan-National to Tampa flights
Dulles Intl to Fort Lauderdale flights
Dulles Intl to Seattle flights
Reagan-National to San Francisco flights
Baltimore to Seattle flights
Reagan-National to Atlanta flights
Dulles Intl to George Bush Intcntl flights
Baltimore to George Bush Intcntl flights
Reagan-National to New Orleans flights
Reagan-National to Fort Lauderdale flights
Baltimore to San Francisco flights
Dulles Intl to Salt Lake City flights
Dulles Intl to West Palm Beach flights
Baltimore to Denver flights
Baltimore to Tampa flights
Reagan-National to Sky Harbor Intl flights
Baltimore to Sky Harbor Intl flights
Baltimore to New Orleans flights
Reagan-National to Salt Lake City flights
Baltimore to Atlanta flights
Reagan-National to Nashville flights

Top 6 airlines flying from Dulles Intl to Colorado

Discover the top 6 airlines that operate flights from Dulles Intl to Colorado. 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 February 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$75Average$222FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$110Average$285FlexibilityNo cancel feeOn-time83%
American AirlinesCheapest$166Average$492FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$393FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$214Average$642FlexibilityNo cancel feeOn-time69%
DeltaCheapest$216Average$290FlexibilityNo 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.