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$97+ 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 2/15. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
janv. 21 — janv. 281
mar. 1/21
mar. 1/28
1 adult, Economy
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Cheap flight deals from Dulles Intl to Colorado

Discover tips and strategies to find the most affordable flight options for your journey from Dulles Intl (IAD) to Colorado (USCO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated janvier 16, 2025.

Round-trip from

$130
(Frontier)

One-way from

$97
(Trip.com)
From Washington, D.C. Dulles Intl to Colorado
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One-way flight from Washington, D.C. Dulles Intl to Colorado
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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 janvier 16, 2025.

This Frontier deal was found by Cheapflights users on 1/16. 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.
lun. 4/213:25 pmIAD - DEN
1 stop9h 27mFrontier
ven. 4/2512:12 amDEN - IAD
1 stop12h 00mFrontier
Deal found 1/16$130
This United Airlines deal was found by Cheapflights users on 1/15. 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.
sam. 2/1510:20 pmIAD - DEN
Nonstop4h 10mUnited Airlines
sam. 2/226:00 amDEN - IAD
Nonstop3h 18mUnited Airlines
Deal found 1/15$177
This Trip.com deal was found by Cheapflights users on 1/15. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 4/223:13 pmIAD - DEN
1 stop9h 55mMultiple Airlines
jeu. 4/245:50 pmDEN - IAD
1 stop14h 33mMultiple Airlines
Deal found 1/15$195
This Southwest deal was found by Cheapflights users on 1/15. 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.
mar. 2/115:50 pmIAD - DEN
Nonstop4h 05mSouthwest
dim. 2/167:25 pmDEN - IAD
Nonstop3h 15mSouthwest
Deal found 1/15$217
This United Airlines deal was found by Cheapflights users on 1/16. 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.
mer. 2/128:33 amIAD - COS
1 stop7h 46mUnited Airlines
sam. 2/156:00 amCOS - IAD
1 stop5h 03mUnited Airlines
Deal found 1/16$229
This Delta deal was found by Cheapflights users on 1/16. 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.
mar. 2/186:00 amIAD - DEN
1 stop5h 59mDelta
ven. 2/216:05 amDEN - IAD
1 stop5h 42mDelta
Deal found 1/16$237
This Delta deal was found by Cheapflights users on 1/15. 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.
ven. 2/216:00 amIAD - HDN
1 stop8h 48mDelta
mar. 2/251:53 pmHDN - IAD
1 stop8h 27mDelta
Deal found 1/15$257
This American Airlines deal was found by Cheapflights users on 1/16. 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.
dim. 2/95:04 pmIAD - COS
1 stop8h 47mAmerican Airlines
sam. 2/1512:36 pmCOS - IAD
1 stop7h 57mAmerican Airlines
Deal found 1/16$259
This Sun Country Air deal was found by Cheapflights users on 1/16. 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.
sam. 8/212:40 pmIAD - DEN
1 stop22h 39mSun Country Air
mer. 8/67:15 pmDEN - IAD
1 stop14h 28mSun Country Air
Deal found 1/16$285
This American Airlines deal was found by Cheapflights users on 1/16. 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.
sam. 2/155:13 pmIAD - DEN
1 stop6h 56mAmerican Airlines
jeu. 2/207:00 amDEN - IAD
2 stops9h 01mAmerican Airlines
Deal found 1/16$294
This Delta deal was found by Cheapflights users on 1/16. 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.
sam. 8/306:15 amIAD - COS
1 stop6h 29mDelta
mer. 9/35:55 pmCOS - IAD
2 stops13h 15mDelta
Deal found 1/16$294
This American Airlines deal was found by Cheapflights users on 1/16. 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.
mer. 3/1911:46 amIAD - EGE
1 stop9h 13mAmerican Airlines
mar. 3/258:00 amEGE - IAD
1 stop6h 20mAmerican Airlines
Deal found 1/16$327

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 janvier 16, 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

mer. 2/26

3:39 pm-11:04 pm

1 stop9h 25m

Denver Intl

mar. 3/4

11:59 pm-2:39 pm

1 stop12h 40m

$130

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

sam. 2/15

10:20 pm-12:30 am

Nonstop4h 10m

Denver Intl

sam. 2/22

6:00 am-11:18 am

Nonstop3h 18m

$177

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

mar. 2/11

5:50 pm-7:55 pm

Nonstop4h 05m

Denver Intl

dim. 2/16

7:25 pm-12:40 am

Nonstop3h 15m

$217

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

mer. 2/12

8:33 am-2:19 pm

1 stop7h 46m

Colorado Springs

sam. 2/15

6:00 am-1:03 pm

1 stop5h 03m

$229

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

mar. 2/18

3:05 pm-8:25 pm

1 stop7h 20m

Denver Intl

mar. 2/25

6:05 am-1:47 pm

1 stop5h 42m

$237

Washington, D.C.Hayden

IAD - HDN

IADHDN

Washington, D.C. Dulles Intl

ven. 2/21

6:00 am-12:48 pm

1 stop8h 48m

Hayden Yampa Valley

mar. 2/25

1:53 pm-12:20 am

1 stop8h 27m

$257

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

dim. 2/9

5:04 pm-11:51 pm

1 stop8h 47m

Colorado Springs

sam. 2/15

12:36 pm-10:33 pm

1 stop7h 57m

$259

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

sam. 2/8

6:10 am-11:45 am

1 stop7h 35m

Denver Intl

lun. 2/10

11:59 pm-8:41 am

1 stop6h 42m

$289

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

ven. 2/21

4:53 pm-9:05 pm

1 stop6h 12m

Colorado Springs

lun. 2/24

6:00 am-3:58 pm

1 stop7h 58m

$299

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

ven. 3/28

6:40 pm-4:00 pm

1 stop23h 20m

Denver Intl

lun. 3/31

12:29 am-5:04 pm

1 stop14h 35m

$315

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/16

Showing 1-10 of 57 results
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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 janvier 16, 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 janvier 16, 2025.

The most flights from IAD to USCO are scheduled on a Monday (19 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (11 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 janvier 16, 2025.
Get a feel of what it's like to fly with Frontier, United Airlines and Southwest 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
4,659 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,659 reviews
Southwest
8.1
Very good
4,659 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,681 reviews
Southwest
8.1
Very good
4,659 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,511 reviews
Southwest
8.1
Very good
4,659 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
8,965 reviews
Southwest
8.1
Very good
4,659 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Allegiant Air
7.4
Good
801 reviews
Southwest
8.1
Very good
4,659 reviews

Food

7.2

Comfort

8.1

Crew

8.7

Boarding

8.2

Overall

8.1

Entertainment

7.7

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

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 $97 on Frontier. Other airlines that offer cheap prices include United Airlines from $109 and Delta from $139 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 - Vail Eagle County 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 (92%), Southwest (90%), United Airlines (81%).

  • 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 $860, 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 $175 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.

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Alternative routes for Dulles Intl to Colorado

See prices for flight routes from nearby airports that may be better suited for you.
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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 janvier 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$227FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$110Average$285FlexibilityNo cancel feeOn-time83%
American AirlinesCheapest$166Average$429FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$354FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$210Average$626FlexibilityNo cancel feeOn-time69%
DeltaCheapest$216Average$303FlexibilityNo cancel feeOn-timeN/A
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