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$96+ 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 6/7. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
May 29 — Jun 51
Fri 5/29
Fri 6/5
1 adult, Economy
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Cheap 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 April 29, 2026.

This Trip.com deal was found by Cheapflights users on 4/24. 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.
Sat 5/306:49 am
IAD
-
DEN
1 stop9h 15m
Frontier
Thu 6/411:54 pm
DEN
-
IAD
1 stop8h 18m
Frontier
Deal found 4/24$199
This Priceline deal was found by Cheapflights users on 4/24. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/83:59 pm
IAD
-
DEN
1 stop8h 40m
Frontier
Mon 5/1111:54 pm
DEN
-
IAD
1 stop8h 18m
Frontier
Deal found 4/24$200
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 5/96:49 am
IAD
-
DEN
1 stop9h 15m
Frontier
Sat 5/166:30 am
DEN
-
IAD
1 stop7h 51m
Frontier
Deal found 4/25$201
This Kiwi.com deal was found by Cheapflights users on 4/28. 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 5/197:40 am
IAD
-
DEN
1 stop8h 24m
Frontier
Wed 5/206:30 am
DEN
-
IAD
1 stop8h 57m
Frontier
Deal found 4/28$202
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Fri 6/58:47 pm
IAD
-
DEN
1 stop14h 18m
Frontier
Mon 6/89:06 pm
DEN
-
IAD
2 stops17h 14m
Frontier
Deal found 4/27$203
This Trip.com deal was found by Cheapflights users on 4/29. 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.
Wed 5/207:40 am
IAD
-
DEN
1 stop8h 24m
Frontier
Tue 5/2611:54 pm
DEN
-
IAD
1 stop8h 18m
Frontier
Deal found 4/29$204
This Expedia deal was found by Cheapflights users on 4/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/911:07 am
IAD
-
DEN
1 stop13h 17m
Frontier
Tue 5/1211:54 pm
DEN
-
IAD
1 stop8h 18m
Frontier
Deal found 4/25$205
This Kiwi.com deal was found by Cheapflights users on 4/25. 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.
Fri 5/298:47 pm
IAD
-
DEN
1 stop14h 18m
Frontier
Mon 6/16:03 am
DEN
-
IAD
2 stops15h 06m
Frontier
Deal found 4/25$206
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 6/111:07 am
IAD
-
DEN
1 stop13h 17m
Frontier
Wed 6/36:03 am
DEN
-
IAD
2 stops9h 24m
Frontier
Deal found 4/25$207
This Kiwi.com deal was found by Cheapflights users on 4/28. 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 6/311:07 am
IAD
-
DEN
1 stop13h 17m
Frontier
Mon 6/810:29 pm
DEN
-
IAD
2 stops33h 53m
Frontier
Deal found 4/28$209
This Frontier deal was found by Cheapflights users on 4/28. 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.
Wed 6/311:07 am
IAD
-
DEN
1 stop13h 17m
Frontier
Tue 6/99:58 am
DEN
-
IAD
1 stop11h 19m
Frontier
Deal found 4/28$210
This Super.com deal was found by Cheapflights users on 4/28. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/269:12 am
IAD
-
DEN
1 stop16h 57m
Frontier
Sat 5/306:30 am
DEN
-
IAD
1 stop7h 51m
Frontier
Deal found 4/28$211

Find 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 April 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$199
(Trip.com)

One-way from

$96
(Kiwi.com)

Popular in

March

Cheapest in

January

Average price

$324

Good round-trip deal

$433 or less

Good one-way deal

$223 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. 8% potential increase in price ($26 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($9 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 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

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 April 29, 2026.
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

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Washington, D.C.Aspen

IAD - ASE

IADASE

Washington, D.C. Dulles Intl

Tue 5/26

10:13 am-2:44 pm

1 stop6h 31m

Aspen Pitkin County

Tue 6/2

8:32 am-5:58 pm

1 stop7h 26m

$355

Washington, D.C.Aspen

IAD - ASE

IADASE

Washington, D.C. Dulles Intl

Sun 5/31

6:08 am-11:19 am

1 stop7h 11m

Aspen Pitkin County

Wed 6/3

8:05 am-10:56 pm

2 stops12h 51m

$362

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 5/12

5:30 pm-12:05 am

1 stop8h 35m

Denver Intl

Sat 5/16

11:10 am-4:25 pm

Nonstop3h 15m

$367

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

Tue 6/2

6:20 am-9:45 am

1 stop5h 25m

Colorado Springs

Tue 6/2

4:05 pm-11:40 pm

1 stop5h 35m

$367

Washington, D.C.Gunnison

IAD - GUC

IADGUC

Washington, D.C. Dulles Intl

Mon 6/29

6:18 am-12:03 pm

1 stop7h 45m

Gunnison

Sat 7/4

12:45 pm-12:14 am

2 stops9h 29m

$374

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Fri 5/15

10:35 pm-12:44 am

Nonstop4h 09m

Denver Intl

Sat 5/16

7:50 am-1:21 pm

Nonstop3h 31m

$377

Washington, D.C.Aspen

IAD - ASE

IADASE

Washington, D.C. Dulles Intl

Tue 6/9

3:56 pm-9:26 pm

1 stop7h 30m

Aspen Pitkin County

Sat 6/13

1:22 pm-9:22 pm

1 stop6h 00m

$382

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sat 5/23

3:55 pm-10:15 pm

1 stop8h 20m

Denver Intl

Mon 5/25

7:05 pm-12:20 am

Nonstop3h 15m

$387

Washington, D.C.Montrose

IAD - MTJ

IADMTJ

Washington, D.C. Dulles Intl

Fri 5/8

7:00 am-12:06 pm

1 stop7h 06m

Montrose County

Fri 5/15

12:37 pm-11:59 pm

2 stops9h 22m

$399

Washington, D.C.Colorado Springs

IAD - COS

IADCOS

Washington, D.C. Dulles Intl

Thu 5/28

6:08 am-12:48 pm

1 stop8h 40m

Colorado Springs

Tue 6/9

11:10 am-11:14 pm

2 stops10h 04m

$407

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 60 resultsSorted by cheapest first
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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

How far ahead should I book a flight from Washington, D.C. Dulles Intl Airport to Colorado?

To ensure you get the cheapest price possible for a flight from Washington, D.C. Dulles Intl Airport to Colorado, you should look to book at least 76 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Colorado (average of $73). Flying from Washington, D.C. Dulles Intl Airport to Colorado in April is currently the most expensive (average of $190). 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 April 29, 2026.

It’s typically best to fly out from Washington, D.C. Dulles Intl Airport to Colorado in the evening. Doing so could potentially save you 18% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Washington, D.C. Dulles Intl Airport to Colorado?

Use this chart to determine the cheapest time to fly round-trip from Dulles Intl to Colorado. Price data was last updated on April 25, 2026.

Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Colorado flight should consider departing on Wednesday evenings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 April 29, 2026.

The most flights from IAD to USCO are scheduled on a Wednesday (23 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (5 on average).

How much does it cost to fly round-trip from Washington, D.C. Dulles Intl Airport to Colorado?

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 April 29, 2026.
Peruse reviews from past customers who have flown with Southwest,United Airlines, andJetBlue from Washington, D.C. Dulles Intl Airport to Colorado to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,314 reviews

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Southwest
8.0
Very good
4,314 reviews
Southwest
8.0
Very good
4,314 reviews

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
United Airlines
7.4
Good
9,680 reviews
Southwest
8.0
Very good
4,314 reviews

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
JetBlue
7.2
Good
2,968 reviews
Southwest
8.0
Very good
4,314 reviews

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
American Airlines
7.1
Good
11,678 reviews
Southwest
8.0
Very good
4,314 reviews

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.
Frontier
5.7
Fair
2,970 reviews
Southwest
8.0
Very good
4,314 reviews

Boarding

8.1

Food

7.0

Crew

8.6

Overall

8.0

Entertainment

7.5

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Dominic,Mar 2026

MCO - SMF

I had to try and sleep on the floor of the Austin airport. I spent 12 hours there. The airline policies were so poor, that a near violent argument broke out between the people in front of me and the flight attendants - making for a super stressful situation at 30,000 feet. Garbage airline choice by Kayak Garbage idea to book a flight with a layover. Next time I will pay for a quality booking myself, and somehow force the company to reimburse it.

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.

  • How long is the flight from Washington, D.C. Dulles Intl Airport to Colorado?

    Airlines like United Airlines, Delta, and Southwest fly from Washington, D.C. Dulles Intl Airport to Colorado in about 6h 31m. The time it takes to get you to your destination can typically vary by up to 2h 04m. There are 1570 mi between Washington, D.C. Dulles Intl Airport and Colorado. This flight may include one or multiple stops.

  • 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 $64 on Frontier. Other airlines that offer cheap prices include Southwest from $88 and United Airlines from $109 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 - Durango La Plata 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: ITA Airways (93%), Ethiopian Air (87%), Copa Airlines (84%).

  • 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 $957, our data shows the cheapest flight currently is $137. When looking at the most popular route, (Washington, D.C. Dulles Intl - Denver Intl), you can expect to pay $199 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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Colorado (average of $73). Flying from Washington, D.C. Dulles Intl Airport to Colorado in April is currently the most expensive (average of $190). 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 Dallas/Fort Worth flights
Baltimore to Dallas/Fort Worth flights
Dulles Intl to Las Vegas flights
Reagan-National to Dallas/Fort Worth flights
Dulles Intl to Seattle flights
Reagan-National to Miami flights
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Reagan-National to Seattle flights
Baltimore to Miami flights
Baltimore to O'Hare Intl flights
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Reagan-National to Las Vegas flights
Dulles Intl to O'Hare Intl flights
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Baltimore to Los Angeles flights
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Reagan-National to Los Angeles flights
Dulles Intl to Denver flights
Dulles Intl to Hobby flights
Reagan-National to O'Hare Intl flights
Baltimore to Boston flights
Dulles Intl to San Francisco flights
Dulles Intl to Atlanta flights
Reagan-National to Hobby flights
Baltimore to Seattle flights
Dulles Intl to Tampa flights
Reagan-National to Atlanta flights
Baltimore to Fort Lauderdale flights
Reagan-National to San Francisco flights
Reagan-National to Boston flights
Dulles Intl to Boston flights
Baltimore to San Francisco flights
Dulles Intl to New Orleans flights
Dulles Intl to Midway flights
Dulles Intl to George Bush Intcntl flights
Reagan-National to Orlando flights
Dulles Intl to San Diego flights
Dulles Intl to Fort Lauderdale flights
Baltimore to George Bush Intcntl flights
Dulles Intl to Minneapolis flights
Reagan-National to George Bush Intcntl flights
Dulles Intl to Sky Harbor Intl flights
Reagan-National to Nashville flights
Baltimore to Tampa flights
Dulles Intl to Detroit flights
Reagan-National to Tampa 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 April 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$94Average$260FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$160Average$439FlexibilityNo cancel feeOn-time71%
JetBlueCheapest$161Average$161FlexibilityNo cancel feeOn-time62%
SouthwestCheapest$177Average$352FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$210Average$492FlexibilityNo cancel feeOn-time69%
DeltaCheapest$218Average$262FlexibilityNo cancel feeOn-timeN/A

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