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$98+ 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 10/14. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
juin 17 — juin 241
mar. 6/17
mar. 6/24
1 adult, Economy
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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 juin 12, 2025.

Round-trip from

$187
(United Airlines)

One-way from

$99
(United Airlines)

Popular in

December

Cheapest in

September

Average price

$307

Good round-trip deal

$293 or less

Good one-way deal

$167 or less
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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Highest demand for flights based on searches. 2% potential increase in price ($6 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Washington, D.C. Dulles Intl to Colorado.
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Price to beat on a 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 juin 12, 2025.

This United Airlines deal was found by Cheapflights users on 6/11. 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. 8/98:06 pmIAD - DEN
Nonstop3h 51mUnited Airlines
sam. 8/166:01 amDEN - IAD
Nonstop3h 26mUnited Airlines
Deal found 6/11$187
This American Airlines deal was found by Cheapflights users on 6/10. 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. 9/135:40 pmIAD - DEN
1 stop6h 29mAmerican Airlines
sam. 9/1311:59 pmDEN - IAD
1 stop6h 47mAmerican Airlines
Deal found 6/10$191
This Booking.com deal was found by Cheapflights users on 6/10. 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.
jeu. 9/43:00 pmIAD - DEN
1 stop19h 33mFrontier
dim. 9/712:34 amDEN - IAD
1 stop11h 41mFrontier
Deal found 6/10$215
This Southwest deal was found by Cheapflights users on 6/11. 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. 7/157:00 pmIAD - DEN
Nonstop3h 55mSouthwest
sam. 7/196:00 pmDEN - IAD
Nonstop3h 30mSouthwest
Deal found 6/11$217
This Mytrip deal was found by Cheapflights users on 6/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 8/14:46 pmIAD - DEN
1 stop16h 30mAllegiant Air
jeu. 8/75:42 pmDEN - IAD
1 stop18h 41mAllegiant Air
Deal found 6/9$228
This United Airlines deal was found by Cheapflights users on 6/12. 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.
mar. 7/156:30 amIAD - HDN
1 stop7h 50mUnited Airlines
jeu. 7/243:25 pmHDN - IAD
1 stop7h 20mUnited Airlines
Deal found 6/12$237
This American Airlines deal was found by Cheapflights users on 6/12. 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.
mar. 8/267:44 amIAD - COS
2 stops10h 44mAmerican Airlines
mer. 9/36:02 amCOS - IAD
1 stop8h 48mAmerican Airlines
Deal found 6/12$242
This Southwest deal was found by Cheapflights users on 6/11. 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.
ven. 7/44:10 pmIAD - COS
1 stop5h 45mSouthwest
mar. 7/1511:20 amCOS - IAD
1 stop5h 05mSouthwest
Deal found 6/11$244
This Delta deal was found by Cheapflights users on 6/11. 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. 7/117:36 pmIAD - DEN
1 stop6h 44mDelta
lun. 7/1412:59 amDEN - IAD
1 stop6h 20mDelta
Deal found 6/11$247
This Mytrip deal was found by Cheapflights users on 6/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 7/254:46 pmIAD - DEN
1 stop16h 30mMultiple Airlines
lun. 7/288:33 amDEN - IAD
1 stop25h 04mMultiple Airlines
Deal found 6/10$251
This Cheapflightsfares deal was found by Cheapflights users on 6/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 7/1212:40 pmIAD - DEN
1 stop10h 16mSun Country Air
sam. 7/196:01 pmDEN - IAD
1 stop15h 42mSun Country Air
Deal found 6/10$260
This Delta deal was found by Cheapflights users on 6/11. 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.
dim. 9/76:15 amIAD - COS
1 stop6h 01mDelta
mer. 9/176:00 amCOS - IAD
1 stop5h 57mDelta
Deal found 6/11$263

Cheapflights Fare Finder

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 juin 12, 2025.
Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Colorado that are best for you.

Fly from

Dulles Intl

Fly to

Colorado

Route

Depart

Return

Price

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

sam. 8/9

8:06 pm-9:57 pm

Nonstop3h 51m

Denver Intl

sam. 8/16

6:01 am-11:27 am

Nonstop3h 26m

$187

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

sam. 9/13

5:40 pm-10:09 pm

1 stop6h 29m

Denver Intl

sam. 9/13

11:59 pm-8:46 am

1 stop6h 47m

$191

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

jeu. 9/4

3:00 pm-8:33 am

1 stop19h 33m

Denver Intl

dim. 9/7

12:34 am-2:15 pm

1 stop11h 41m

$215

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

mer. 7/30

7:00 pm-8:55 pm

Nonstop3h 55m

Denver Intl

lun. 8/4

6:00 pm-11:30 pm

Nonstop3h 30m

$227

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

ven. 8/1

4:46 pm-7:16 am

1 stop16h 30m

Denver Intl

jeu. 8/7

5:42 pm-2:23 pm

1 stop18h 41m

$228

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

mar. 7/15

5:23 pm-11:06 pm

1 stop7h 43m

Denver Intl

lun. 7/28

12:55 am-8:59 am

1 stop6h 04m

$237

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

mar. 8/26

7:44 am-4:28 pm

2 stops10h 44m

Colorado Springs

mer. 9/3

6:02 am-4:50 pm

1 stop8h 48m

$242

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

ven. 7/4

4:10 pm-7:55 pm

1 stop5h 45m

Colorado Springs

mar. 7/15

11:20 am-6:25 pm

1 stop5h 05m

$244

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

ven. 7/25

4:46 pm-7:16 am

1 stop16h 30m

Denver Intl

lun. 7/28

8:33 am-11:37 am

1 stop25h 04m

$251

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

sam. 7/12

12:40 pm-8:56 pm

1 stop10h 16m

Denver Intl

sam. 7/19

6:01 pm-11:43 am

1 stop15h 42m

$260

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

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.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. Dulles Intl Airport to Colorado

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 juin 12, 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 juin 12, 2025.

The most flights from IAD to USCO are scheduled on a Thursday (28 on average). You will have fewer flight options on Sunday, 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 juin 12, 2025.
Get a feel of what it's like to fly with Alaska Airlines, Southwest 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.
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Delta
8.0
Very good
7,950 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Entertainment

7.1

Crew

8.5

Overall

8.0

Comfort

7.8

Boarding

8.1

Food

7.1

Reviews

1 / 20
10.0
Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

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 United Airlines. Other airlines that offer cheap prices include American Airlines from $100 and Allegiant Air from $103 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 - Colorado Springs and Washington, D.C. Dulles Intl - Aspen Pitkin County.

  • 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 (90%), United Airlines (78%), Copa Airlines (76%).

  • 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 $707, our data shows the cheapest flight currently is $115. 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 $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.
Dulles Intl to Seattle flights
Dulles Intl to Los Angeles flights
Reagan-National to Los Angeles flights
Baltimore to Dallas/Fort Worth flights
Reagan-National to Seattle flights
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Reagan-National to Las Vegas flights
Reagan-National to San Francisco flights
Dulles Intl to Orlando flights
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Baltimore to Orlando flights
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Baltimore to Atlanta flights
Reagan-National to Atlanta flights
Reagan-National to Dallas/Fort Worth flights
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Dulles Intl to Tampa flights
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Dulles Intl to Hobby flights
Reagan-National to Fort Lauderdale flights
Dulles Intl to San Diego flights
Reagan-National to Denver flights
Dulles Intl to Honolulu flights
Reagan-National to Hobby flights
Reagan-National to San Diego flights
Baltimore to New Orleans flights
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Baltimore to George Bush Intcntl flights
Reagan-National to Portland flights
Dulles Intl to Portland flights
Reagan-National to Minneapolis flights

Top 5 airlines flying from Dulles Intl to Colorado

Discover the top 5 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 juin 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$79Average$237FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$166Average$428FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$206Average$611FlexibilityNo cancel feeOn-time69%
DeltaCheapest$216Average$280FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$217Average$399FlexibilityNo cancel feeOn-time63%

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