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$93+ 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 2/23. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
Feb 26 — Mar 51
Thu 2/26
Thu 3/5
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 January 27, 2026.

This Kiwi.com deal was found by Cheapflights users on 1/26. 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 3/25:22 pm
IAD
-
DEN
1 stop20h 34m
Frontier
Sat 3/78:50 am
DEN
-
IAD
1 stop13h 41m
Frontier
Deal found 1/26$131
This Expedia deal was found by Cheapflights users on 1/25. 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 2/2110:29 am
IAD
-
DEN
1 stop13h 04m
Frontier
Fri 2/2712:59 am
DEN
-
IAD
1 stop6h 35m
Frontier
Deal found 1/25$138
This Kiwi.com deal was found by Cheapflights users on 1/25. 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.
Thu 3/55:37 pm
IAD
-
DEN
1 stop20h 32m
Frontier
Wed 3/1111:59 pm
DEN
-
IAD
1 stop22h 32m
Frontier
Deal found 1/25$147
This Frontier deal was found by Cheapflights users on 1/27. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/1911:22 am
IAD
-
DEN
1 stop12h 19m
Frontier
Sun 2/2212:59 am
DEN
-
IAD
1 stop7h 41m
Frontier
Deal found 1/27$148
This Kiwi.com deal was found by Cheapflights users on 1/26. 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 3/27:05 pm
IAD
-
DEN
2 stops28h 36m
Multiple Airlines
Sat 3/78:50 am
DEN
-
IAD
1 stop13h 41m
Multiple Airlines
Deal found 1/26$152
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
Sun 3/86:30 pm
IAD
-
DEN
1 stop14h 32m
Frontier
Wed 3/1111:59 pm
DEN
-
IAD
1 stop22h 32m
Frontier
Deal found 1/26$153
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
Thu 2/2611:22 am
IAD
-
DEN
1 stop12h 19m
Frontier
Wed 3/47:30 pm
DEN
-
IAD
1 stop20h 27m
Frontier
Deal found 1/26$163
This Expedia deal was found by Cheapflights users on 1/25. 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.
Mon 3/211:41 am
IAD
-
DEN
1 stop12h 00m
Frontier
Wed 3/412:05 pm
DEN
-
IAD
1 stop24h 57m
Frontier
Deal found 1/25$164
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Tue 3/247:00 am
IAD
-
DEN
1 stop7h 09m
Frontier
Wed 3/251:09 pm
DEN
-
IAD
1 stop9h 12m
Frontier
Deal found 1/27$165
This Kiwi.com deal was found by Cheapflights users on 1/26. 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.
Sun 3/111:15 am
IAD
-
DEN
1 stop12h 55m
Frontier
Wed 3/47:30 pm
DEN
-
IAD
1 stop20h 27m
Frontier
Deal found 1/26$166
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Sun 3/111:15 am
IAD
-
DEN
1 stop12h 55m
Frontier
Tue 3/3111:59 pm
DEN
-
IAD
1 stop22h 37m
Frontier
Deal found 1/27$169
This Delta deal was found by Cheapflights users on 1/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/46:00 am
IAD
-
HDN
2 stops10h 43m
Delta
Wed 3/112:05 pm
HDN
-
IAD
1 stop8h 22m
Delta
Deal found 1/27$242

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 January 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$131
(Kiwi.com)

One-way from

$93
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$257

Good round-trip deal

$338 or less

Good one-way deal

$197 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. 3% potential increase in price ($9 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 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 January 27, 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

Dulles Intl

Fly to

Colorado

Route

Depart

Return

Price

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sat 3/7

10:30 pm-12:30 am

Nonstop4h 00m

Denver Intl

Tue 3/10

11:59 pm-5:17 am

Nonstop3h 18m

$177

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Wed 2/25

7:35 pm-12:23 am

1 stop6h 48m

Denver Intl

Wed 3/4

7:20 am-2:45 pm

1 stop5h 25m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sat 2/21

5:05 am-7:05 am

Nonstop4h 00m

Denver Intl

Fri 2/27

9:30 am-2:45 pm

Nonstop3h 15m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 3/3

6:00 am-10:03 am

1 stop6h 03m

Denver Intl

Tue 3/10

4:17 pm-12:27 am

1 stop6h 10m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Wed 2/18

5:10 pm-7:31 pm

Nonstop4h 21m

Denver Intl

Sat 2/21

11:59 pm-5:18 am

Nonstop3h 19m

$217

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Sat 3/7

6:05 pm-8:10 pm

Nonstop4h 05m

Denver Intl

Wed 3/11

7:35 am-5:20 pm

1 stop7h 45m

$227

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Tue 2/24

2:17 pm-8:05 pm

1 stop7h 48m

Denver Intl

Mon 3/2

12:59 am-9:13 am

1 stop6h 14m

$227

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 3/19

5:50 am-7:45 am

Nonstop3h 55m

Denver Intl

Tue 3/31

6:35 pm-11:40 pm

Nonstop3h 05m

$237

Washington, D.C.Denver

IAD - DEN

IADDEN

Washington, D.C. Dulles Intl

Thu 3/5

5:50 am-7:45 am

Nonstop3h 55m

Denver Intl

Mon 3/9

7:05 pm-12:15 am

Nonstop3h 10m

$237

Washington, D.C.Hayden

IAD - HDN

IADHDN

Washington, D.C. Dulles Intl

Sun 2/22

6:00 am-12:33 pm

1 stop8h 33m

Hayden Yampa Valley

Wed 2/25

1:23 pm-10:53 pm

1 stop7h 30m

$247

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/27

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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Colorado (average of $133). Flying from Washington, D.C. Dulles Intl Airport to Colorado in April is currently the most expensive (average of $243). 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 January 27, 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 23% 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 January 24, 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 January 27, 2026.

The most flights from IAD to USCO are scheduled on a Monday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (10 on average).

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 January 27, 2026.
Peruse reviews from past customers who have flown with Southwest, Delta, and United Airlines 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
4,268 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Southwest
8.0
Very good
4,268 reviews
Southwest
8.0
Very good
4,268 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Delta
7.9
Good
8,118 reviews
Southwest
8.0
Very good
4,268 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
United Airlines
7.4
Good
9,205 reviews
Southwest
8.0
Very good
4,268 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
American Airlines
7.2
Good
11,197 reviews
Southwest
8.0
Very good
4,268 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am
Frontier
5.7
Fair
3,056 reviews
Southwest
8.0
Very good
4,268 reviews

Crew

8.6

Food

7.0

Entertainment

7.5

Overall

8.0

Boarding

8.1

Comfort

8.0

Reviews

1 / 20
2.0
Mediocre

Thomas,Dec 2025

SEA - DEN

Plane two hours late in leaving 1:00 pm west coat time got home next day at 2:45am most car rental places are closed and don’t open till 5am

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 4h. The time it takes to get you to your destination can typically vary by up to 2h 48m. There are 1448 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 $88 on Frontier. Other airlines that offer cheap prices include Southwest from $88 and United Airlines from $108 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 - Aspen Pitkin 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 (93%), Avianca (88%), United Airlines (87%).

  • 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 $859, our data shows the cheapest flight currently is $132. 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, January is the cheapest month in which you can book a flight from Washington, D.C. Dulles Intl Airport to Colorado (average of $133). Flying from Washington, D.C. Dulles Intl Airport to Colorado in April is currently the most expensive (average of $243). 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

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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 Miami flights
Reagan-National to Miami flights
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Baltimore to Fort Lauderdale flights
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Dulles Intl to Dallas/Fort Worth flights
Reagan-National to Orlando flights
Baltimore to Miami flights
Dulles Intl to Fort Lauderdale flights
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Reagan-National to Fort Lauderdale flights
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Reagan-National to Seattle flights
Baltimore to Dallas/Fort Worth flights
Reagan-National to Hobby flights
Reagan-National to San Francisco flights
Baltimore to Atlanta flights
Dulles Intl to New Orleans flights
Baltimore to San Francisco flights
Dulles Intl to San Francisco flights
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Reagan-National to Atlanta flights
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Baltimore to O'Hare Intl flights
Dulles Intl to Salt Lake City flights
Reagan-National to Tampa flights
Reagan-National to Dallas/Fort Worth flights
Baltimore to Seattle flights
Reagan-National to George Bush Intcntl flights
Reagan-National to Denver flights
Baltimore to New Orleans flights
Baltimore to Tampa flights
Baltimore to Sky Harbor Intl flights
Reagan-National to New Orleans flights
Baltimore to Hobby flights
Dulles Intl to Austin flights
Reagan-National to West Palm Beach flights
Baltimore to Salt Lake City flights
Dulles Intl to George Bush Intcntl 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 January 27, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$82Average$248FlexibilityNo cancel feeOn-time62%
American AirlinesCheapest$160Average$395FlexibilityNo cancel feeOn-time71%
SouthwestCheapest$177Average$336FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$215Average$479FlexibilityNo cancel feeOn-time69%
DeltaCheapest$236Average$277FlexibilityNo cancel feeOn-timeN/A

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