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$99+ 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 2/16. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
Dec 23 — Dec 301
Mon 12/23
Mon 12/30
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 December 18, 2024.

Round-trip from

$137
(CheapOair)

One-way from

$99
(CheapOair)
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 December 18, 2024.

This Frontier deal was found by Cheapflights users on 12/17. 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.
Tue 12/3111:34 amIAD - DEN
1 stop14h 10mFrontier
Mon 1/611:58 pmDEN - IAD
1 stop9h 57mFrontier
Deal found 12/17$148
This Delta deal was found by Cheapflights users on 12/17. 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 12/246:00 amIAD - DEN
1 stop5h 46mDelta
Tue 1/72:21 pmDEN - IAD
1 stop7h 19mDelta
Deal found 12/17$436
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/316:35 amIAD - DEN
Nonstop4h 08mUnited Airlines
Sun 1/511:50 pmDEN - IAD
Nonstop3h 13mUnited Airlines
Deal found 12/17$463
This American Airlines deal was found by Cheapflights users on 12/18. 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 12/315:00 amIAD - DEN
1 stop6h 32mAmerican Airlines
Fri 1/318:07 amDEN - IAD
2 stops9h 28mAmerican Airlines
Deal found 12/18$467
This Southwest deal was found by Cheapflights users on 12/17. 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.
Thu 12/265:15 amIAD - DEN
Nonstop3h 55mSouthwest
Thu 1/236:10 amDEN - IAD
1 stop8h 55mSouthwest
Deal found 12/17$517
This American Airlines deal was found by Cheapflights users on 12/17. 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 12/196:21 amIAD - HDN
1 stop8h 09mAmerican Airlines
Mon 12/231:20 pmHDN - IAD
1 stop7h 19mAmerican Airlines
Deal found 12/17$556
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/244:05 pmIAD - GJT
1 stop6h 48mUnited Airlines
Mon 12/301:25 pmGJT - IAD
1 stop8h 00mUnited Airlines
Deal found 12/17$588
This Southwest deal was found by Cheapflights users on 12/17. 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 12/315:45 pmIAD - COS
1 stop5h 55mSouthwest
Fri 1/36:30 amCOS - IAD
1 stop5h 40mSouthwest
Deal found 12/17$631
This United Airlines deal was found by Cheapflights users on 12/17. 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 12/3112:35 pmIAD - COS
1 stop7h 18mUnited Airlines
Fri 1/37:00 amCOS - IAD
1 stop6h 39mUnited Airlines
Deal found 12/17$696
This United Airlines deal was found by Cheapflights users on 12/18. 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.
Thu 12/1912:45 pmIAD - EGE
1 stop7h 40mUnited Airlines
Sun 12/2211:49 amEGE - IAD
1 stop8h 45mUnited Airlines
Deal found 12/18$714
This United deal was found by Cheapflights users on 12/17. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/256:30 amIAD - MTJ
1 stop7h 56mUnited Airlines
Mon 12/3012:55 pmMTJ - IAD
1 stop6h 05mUnited Airlines
Deal found 12/17$723
This Delta deal was found by Cheapflights users on 12/18. 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 12/2410:00 amIAD - COS
2 stops11h 39mDelta
Sat 12/281:58 pmCOS - IAD
1 stop5h 42mDelta
Deal found 12/18$793

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 December 18, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 3/4

5:45 pm-11:44 pm

1 stop7h 59m

Denver Intl

Mon 3/10

12:39 am-4:54 pm

1 stop14h 15m

$137

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 2/20

8:10 pm-10:17 pm

Nonstop4h 07m

Denver Intl

Wed 2/26

6:00 am-11:18 am

Nonstop3h 18m

$197

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sun 2/2

6:55 am-9:00 am

Nonstop4h 05m

Denver Intl

Tue 2/4

9:50 am-3:05 pm

Nonstop3h 15m

$198

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sat 1/18

6:00 pm-5:36 pm

1 stop25h 36m

Denver Intl

Thu 1/23

7:42 pm-6:19 pm

1 stop20h 37m

$202

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sat 1/25

6:05 am-1:16 pm

1 stop9h 11m

Denver Intl

Tue 1/28

7:10 am-5:16 pm

1 stop8h 06m

$236

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

Sat 1/18

5:24 pm-10:35 pm

1 stop7h 11m

Colorado Springs

Sat 1/25

6:00 am-4:14 pm

1 stop8h 14m

$240

Washington, D.C.Hayden

IAD - HDN

IADHDN

Washington, D.C. Dulles Intl

Sun 1/19

6:00 am-12:48 pm

1 stop8h 48m

Hayden Yampa Valley

Wed 1/22

3:47 pm-11:40 pm

1 stop5h 53m

$256

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

Sat 2/15

5:15 pm-10:00 pm

1 stop6h 45m

Colorado Springs

Tue 2/18

7:30 am-3:33 pm

1 stop6h 03m

$269

Washington, D.C.Durango

IAD - DRO

IADDRO

Washington, D.C. Dulles Intl

Wed 1/8

6:10 am-3:03 pm

2 stops10h 53m

Durango La Plata County

Tue 1/14

5:27 am-4:14 pm

1 stop8h 47m

$283

Washington, D.C.Grand Junction

IAD - GJT

IADGJT

Washington, D.C. Dulles Intl

Wed 2/5

6:10 am-11:30 am

1 stop7h 20m

Grand Junction Regnl

Mon 2/10

12:00 pm-10:41 pm

1 stop8h 41m

$288

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/17

Showing 1-10 of 60 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 $271). 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 December 18, 2024.

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.

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 December 18, 2024.
Get a feel of what it's like to fly with Delta, United Airlines and Alaska Airlines 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
4,848 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

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
4,848 reviews
Southwest
8.1
Very good
4,848 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

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
9,552 reviews
Southwest
8.1
Very good
4,848 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

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
8,604 reviews
Southwest
8.1
Very good
4,848 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

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
9,059 reviews
Southwest
8.1
Very good
4,848 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

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.

American Airlines
7.2
Good
10,000 reviews
Southwest
8.1
Very good
4,848 reviews

Overall

8.1

Boarding

8.2

Crew

8.7

Food

7.2

Comfort

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 $99 on Frontier. Other airlines that offer cheap prices include United Airlines from $109 and Delta from $118 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 (97%), Copa Airlines (92%), Southwest (91%).

  • 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 $825, our data shows the cheapest flight currently is $134. When looking at the most popular route, (Washington, D.C. Dulles Intl - Denver Intl), you can expect to pay $177 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 $271). 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 December 18, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$78Average$221FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$110Average$285FlexibilityNo cancel feeOn-time83%
American AirlinesCheapest$166Average$486FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$198Average$389FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$208Average$609FlexibilityNo cancel feeOn-time69%
DeltaCheapest$216Average$304FlexibilityNo cancel feeOn-timeN/A
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