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

Airlines like United Airlines, Delta, and American Airlines fly from Washington, D.C. Dulles Intl Airport to Colorado in about 4h 07m. The time it takes to get you to your destination can typically vary by up to 4h 52m. 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 American Airlines from $119 one-way.

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.

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).

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 - Grand Junction Regnl.

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 $1,140, our data shows the cheapest flight currently is $238. When looking at the most popular route, (Washington, D.C. Dulles Intl - Denver Intl), you can expect to pay $262 for that flight.

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: Southwest (100%), Ethiopian Air (87%), United Airlines (82%).

What are the most popular airlines that fly from Washington, D.C. Dulles Intl Airport to Colorado?

Before booking your flight from Washington, D.C. Dulles Intl Airport to Colorado check out the most popular airlines for this route: United Airlines, Southwest or Frontier.

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.

$117+ Cheap Flights from Washington, D.C. Dulles Intl Airport to Colorado

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Cheap flight deals from Dulles Intl to Colorado

Cheapest

Best

Last-minute

One-way

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 August 10, 2026.

Sat 9/57:24 pm -

1 stop13h 04m

Sat 9/126:38 pm -

1 stop9h 42m

Deal found 8/10

$249

Tue 8/257:24 pm -

1 stop13h 04m

Tue 9/110:09 am -

1 stop6h 20m

Deal found 8/10

$250

Wed 10/141:38 pm -

1 stop21h 49m

Sun 10/1811:48 pm -

1 stop15h 48m

Deal found 8/10

$251

Sat 9/197:28 pm -

1 stop14h 40m

Mon 9/2110:50 pm -

1 stop29h 30m

Deal found 8/10

$252

Fri 9/259:04 pm -

2 stops20h 37m

Mon 9/286:38 pm -

1 stop9h 42m

Deal found 8/10

$253

Thu 10/157:00 am -

1 stop9h 00m

Sun 10/187:34 pm -

1 stop14h 33m

Deal found 8/8

$254

Fri 9/49:54 pm -

1 stop12h 13m

Tue 9/88:15 pm -

2 stops25h 55m

Deal found 8/10

$255

Tue 8/258:59 am -

1 stop11h 01m

Sat 8/2910:09 am -

1 stop6h 20m

Deal found 8/10

$257

Wed 8/268:59 am -

1 stop11h 01m

Tue 9/110:45 pm -

1 stop7h 19m

Deal found 8/9

$258

Fri 9/49:54 pm -

1 stop19h 24m

Mon 9/710:45 pm -

1 stop28h 16m

Deal found 8/9

$259

Mon 8/2410:45 am -

1 stop14h 15m

Wed 8/266:55 pm -

1 stop11h 09m

Deal found 8/10

$260

Mon 9/213:15 pm -

1 stop6h 41m

Wed 9/306:00 am -

1 stop6h 11m

Deal found 8/10

$280

Best flights from Dulles Intl to Colorado
Discover carefully curated flight deals from Dulles Intl to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 10, 2026.

Sat 9/125:26 pm -

Nonstop4h 07m

Thu 9/176:00 am -

Nonstop3h 25m

Deal found 8/10

$319

Wed 9/98:08 am -

1 stop7h 13m

Wed 9/167:15 am -

1 stop7h 56m

Deal found 8/8

$339

Tue 1/55:25 pm -

1 stop25h 20m

Sun 1/104:15 pm -

1 stop24h 46m

Deal found 8/10

$393

Fri 12/257:20 am -

1 stop9h 37m

Wed 12/301:31 pm -

1 stop7h 18m

Deal found 8/9

$422

Tue 9/1510:34 pm -

Nonstop3h 56m

Sun 9/2011:59 pm -

Nonstop3h 26m

Deal found 8/10

$319

Tue 9/2912:40 pm -

Nonstop3h 50m

Mon 10/56:00 am -

Nonstop3h 25m

Deal found 8/7

$319

Wed 1/277:30 am -

1 stop8h 59m

Tue 2/21:28 pm -

1 stop5h 44m

Deal found 8/10

$359

Thu 9/1010:34 pm -

Nonstop3h 56m

Mon 9/145:50 pm -

Nonstop3h 29m

Deal found 8/10

$319

Sat 1/236:00 am -

1 stop8h 21m

Thu 1/281:28 pm -

1 stop5h 44m

Deal found 8/6

$359

Fri 10/2310:34 pm -

Nonstop3h 56m

Thu 10/2911:59 pm -

Nonstop3h 20m

Deal found 8/10

$319

Sat 1/306:00 am -

2 stops10h 29m

Tue 2/21:28 pm -

1 stop5h 44m

Deal found 8/6

$364

Sat 10/247:02 am -

2 stops17h 10m

Tue 10/2712:00 pm -

1 stop9h 59m

Deal found 8/10

$462

Thu 9/1012:26 pm -

2 stops11h 31m

Mon 9/146:53 pm -

2 stops12h 16m

Deal found 8/5

$369

Tue 9/15:15 pm -

1 stop6h 39m

Sun 9/65:30 am -

1 stop5h 59m

Deal found 8/10

$336

Sat 9/56:33 am -

2 stops16h 41m

Thu 9/1012:40 pm -

2 stops19h 15m

Deal found 8/5

$517

Tue 9/226:00 am -

1 stop8h 14m

Wed 9/306:00 am -

1 stop6h 11m

Deal found 8/7

$389

Tue 2/24:08 pm -

1 stop6h 25m

Tue 2/91:29 pm -

1 stop7h 44m

Deal found 8/10

$359

Sun 10/46:52 am -

1 stop8h 34m

Sat 10/1012:39 pm -

1 stop8h 44m

Deal found 8/10

$548

Tue 10/2010:57 am -

2 stops11h 19m

Mon 10/266:00 am -

1 stop6h 08m

Deal found 8/6

$394

Tue 11/1010:00 am -

1 stop6h 36m

Sat 11/141:47 pm -

1 stop5h 43m

Deal found 8/10

$359

Sat 2/66:14 am -

1 stop7h 52m

Tue 2/912:36 pm -

2 stops8h 36m

Deal found 8/5

$553

Sat 1/2312:35 pm -

Nonstop4h 29m

Sat 1/304:06 pm -

Nonstop3h 43m

Deal found 8/10

$374

Thu 9/36:09 am -

1 stop8h 01m

Sun 9/612:55 pm -

1 stop7h 57m

Deal found 8/9

$554

Tue 9/16:00 am -

1 stop6h 47m

Thu 10/16:00 am -

1 stop8h 17m

Deal found 8/10

$434

Tue 9/86:15 am -

1 stop6h 32m

Thu 9/105:30 am -

1 stop6h 00m

Deal found 8/7

$389

Sat 10/108:03 am -

1 stop6h 18m

Thu 10/151:31 pm -

1 stop5h 49m

Deal found 8/10

$434

Thu 9/107:57 am -

2 stops15h 25m

Mon 9/1410:55 am -

1 stop7h 29m

Deal found 8/5

$591

Wed 8/2610:16 am -

2 stops10h 02m

Sat 8/297:41 am -

2 stops10h 24m

Deal found 8/8

$439

Fri 9/187:20 pm -

Nonstop3h 56m

Mon 9/2111:59 pm -

Nonstop3h 26m

Deal found 8/10

$409

Fri 10/96:42 am -

1 stop7h 41m

Sun 10/111:14 pm -

1 stop8h 09m

Deal found 8/7

$622

Last-minute flights from Dulles Intl to Colorado
Discover last-minute flight deals from Dulles Intl to Colorado. Data last updated August 10, 2026 and is based on user searches.

Mon 8/2410:45 am -

1 stop14h 15m

Wed 8/266:55 pm -

1 stop11h 09m

Deal found 8/10

$260

Tue 8/257:24 pm -

1 stop13h 04m

Tue 9/110:09 am -

1 stop6h 20m

Deal found 8/10

$250

Tue 8/258:59 am -

1 stop11h 01m

Sat 8/2910:09 am -

1 stop6h 20m

Deal found 8/10

$257

Wed 8/268:59 am -

1 stop11h 01m

Tue 9/110:45 pm -

1 stop7h 19m

Deal found 8/9

$258

Fri 9/49:54 pm -

1 stop12h 13m

Tue 9/88:15 pm -

2 stops25h 55m

Deal found 8/10

$255

Fri 9/49:54 pm -

1 stop19h 24m

Mon 9/710:45 pm -

1 stop28h 16m

Deal found 8/9

$259

Sat 9/57:24 pm -

1 stop13h 04m

Sat 9/126:38 pm -

1 stop9h 42m

Deal found 8/10

$249

Mon 9/146:36 pm -

2 stops15h 16m

Fri 9/189:19 pm -

1 stop12h 14m

Deal found 8/9

$261

Sat 9/197:28 pm -

1 stop14h 40m

Mon 9/2110:50 pm -

1 stop29h 30m

Deal found 8/10

$252

Sat 9/199:04 pm -

1 stop13h 00m

Wed 9/2312:24 pm -

1 stop9h 46m

Deal found 8/10

$262

Mon 9/213:15 pm -

1 stop6h 41m

Wed 9/306:00 am -

1 stop6h 11m

Deal found 8/10

$280

Fri 9/259:04 pm -

2 stops20h 37m

Mon 9/286:38 pm -

1 stop9h 42m

Deal found 8/10

$253

One-way flights from Dulles Intl to Colorado
Search for one-way flight options from Dulles Intl to Colorado. Find affordable one-way fares based on user searches. Data last updated August 10, 2026.

Tue 9/157:50 am -

2 stops15h 59m

Deal found 8/10

$117

Wed 9/28:59 am -

1 stop11h 01m

Deal found 8/10

$118

Thu 9/246:00 am -

1 stop11h 00m

Deal found 8/10

$120

Mon 9/79:44 pm -

2 stops36h 20m

Deal found 8/10

$122

Sun 9/66:20 am -

1 stop9h 41m

Deal found 8/9

$126

Mon 8/3112:00 pm -

2 stops22h 07m

Deal found 8/9

$127

Tue 8/258:59 am -

1 stop11h 01m

Deal found 8/10

$129

Sun 8/234:52 pm -

1 stop8h 08m

Deal found 8/6

$130

Sun 8/304:52 pm -

1 stop8h 08m

Deal found 8/10

$132

Mon 9/147:50 am -

2 stops15h 49m

Deal found 8/6

$133

Tue 9/152:43 pm -

1 stop8h 01m

Deal found 8/10

$134

Tue 9/1511:10 am -

2 stops10h 46m

Deal found 8/10

$139

Find flight deals from Dulles Intl to Colorado

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$242 (Delta)
One-way from	$117 (Kiwi.com)
Popular in	June
Cheapest in	January
Average price	$362
Good round-trip deal	$398 or less
Good one-way deal	$328 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. 18% potential increase in price ($72 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in August 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

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.Denver

IAD Washington, D.C. Dulles Intl - DEN Denver Intl

IADDEN

Washington, D.C. Dulles Intl

Sat 9/12

5:26 pm-7:33 pm

Nonstop4h 07m

Denver Intl

Thu 9/17

6:00 am-11:25 am

Nonstop3h 25m

$319

Washington, D.C.Denver

IAD Washington, D.C. Dulles Intl - DEN Denver Intl

IADDEN

Washington, D.C. Dulles Intl

Tue 9/15

10:34 pm-12:30 am

Nonstop3h 56m

Denver Intl

Sun 9/20

11:59 pm-5:25 am

Nonstop3h 26m

$319

Quickest round-trip

Washington, D.C.Denver

IAD Washington, D.C. Dulles Intl - DEN Denver Intl

IADDEN

Washington, D.C. Dulles Intl

Tue 9/29

12:40 pm-2:30 pm

Nonstop3h 50m

Denver Intl

Mon 10/5

6:00 am-11:25 am

Nonstop3h 25m

$319

Washington, D.C.Denver

IAD Washington, D.C. Dulles Intl - DEN Denver Intl

IADDEN

Washington, D.C. Dulles Intl

Thu 9/10

10:34 pm-12:30 am

Nonstop3h 56m

Denver Intl

Mon 9/14

5:50 pm-11:19 pm

Nonstop3h 29m

$319

Washington, D.C.Denver

IAD Washington, D.C. Dulles Intl - DEN Denver Intl

IADDEN

Washington, D.C. Dulles Intl

Fri 10/23

10:34 pm-12:30 am

Nonstop3h 56m

Denver Intl

Thu 10/29

11:59 pm-5:19 am

Nonstop3h 20m

$319

Washington, D.C.Colorado Springs

IAD Washington, D.C. Dulles Intl - COS Colorado Springs

IADCOS

Washington, D.C. Dulles Intl

Tue 9/1

5:15 pm-9:54 pm

1 stop6h 39m

Colorado Springs

Sun 9/6

5:30 am-1:29 pm

1 stop5h 59m

$336

Washington, D.C.Denver

IAD Washington, D.C. Dulles Intl - DEN Denver Intl

IADDEN

Washington, D.C. Dulles Intl

Wed 9/9

8:08 am-1:21 pm

1 stop7h 13m

Denver Intl

Wed 9/16

7:15 am-5:11 pm

1 stop7h 56m

$339

Washington, D.C.Hayden

IAD Washington, D.C. Dulles Intl - HDN Hayden Yampa Valley

IADHDN

Washington, D.C. Dulles Intl

Wed 1/27

7:30 am-2:29 pm

1 stop8h 59m

Hayden Yampa Valley

Tue 2/2

1:28 pm-9:12 pm

1 stop5h 44m

$359

Washington, D.C.Hayden

IAD Washington, D.C. Dulles Intl - HDN Hayden Yampa Valley

IADHDN

Washington, D.C. Dulles Intl

Sat 1/23

6:00 am-12:21 pm

1 stop8h 21m

Hayden Yampa Valley

Thu 1/28

1:28 pm-9:12 pm

1 stop5h 44m

$359

Washington, D.C.Hayden

IAD Washington, D.C. Dulles Intl - HDN Hayden Yampa Valley

IADHDN

Washington, D.C. Dulles Intl

Tue 2/2

4:08 pm-8:33 pm

1 stop6h 25m

Hayden Yampa Valley

Tue 2/9

1:29 pm-11:13 pm

1 stop7h 44m

$359

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/10

Showing 1-10 of 60 resultsSorted by cheapest first

...

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.

IAD-DEN

IAD-HDN

IAD-GJT

IAD-COS

IAD-DRO

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

IAD-USCO

IAD-DEN

IAD-HDN

IAD-GJT

IAD-COS

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 $338). Flying from Washington, D.C. Dulles Intl Airport to Colorado in July is currently the most expensive (average of $539). 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?

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 10% on the flight price compared to flying in the morning, which is usually more expensive.

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

Airfare is below average for this route at the moment.

Washington, D.C. Dulles Intl Airport to Colorado flights typically cost between $373 and $549 in September.
The cheapest round-trip price found within the last 5 days was $249 on Frontier (Sep 5-Sep 12).

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 43 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 day to fly from Washington, D.C. Dulles Intl Airport to Colorado?

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. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Colorado

Peruse reviews from past customers who have flown with Southwest,Delta, andUnited 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

4,218 reviews

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

4,218 reviews

Southwest

8.0

Very good

4,218 reviews

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

7.8

Good

8,497 reviews

Southwest

8.0

Very good

4,218 reviews

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

10,095 reviews

Southwest

8.0

Very good

4,218 reviews

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

JetBlue

7.1

Good

3,031 reviews

Southwest

8.0

Very good

4,218 reviews

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

5.6

Fair

2,713 reviews

Southwest

8.0

Very good

4,218 reviews

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

How long is the flight from Washington, D.C. Dulles Intl Airport to Colorado?
Airlines like United Airlines, Delta, and American Airlines fly from Washington, D.C. Dulles Intl Airport to Colorado in about 4h 07m. The time it takes to get you to your destination can typically vary by up to 4h 52m. 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 American Airlines from $119 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 - Grand Junction Regnl.
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: Southwest (100%), Ethiopian Air (87%), United Airlines (82%).
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 $1,140, our data shows the cheapest flight currently is $238. When looking at the most popular route, (Washington, D.C. Dulles Intl - Denver Intl), you can expect to pay $262 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 $338). Flying from Washington, D.C. Dulles Intl Airport to Colorado in July is currently the most expensive (average of $539). 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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Top 6 airlines flying from Dulles Intl to Colorado

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$80	Average$270	FlexibilityNo cancel fee	On-time62%
JetBlue	Cheapest$161	Average$360	FlexibilityNo cancel fee	On-time62%
Southwest	Cheapest$178	Average$387	FlexibilityNo cancel fee	On-time63%
Delta	Cheapest$218	Average$599	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$223	Average$525	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$332	Average$442	FlexibilityNo cancel fee	On-time71%

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$117+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from Dulles Intl to Colorado

Cheapest flights from Dulles Intl to ColoradoExplore 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 August 10, 2026.

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 August 10, 2026.

Best flights from Dulles Intl to ColoradoDiscover carefully curated flight deals from Dulles Intl to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 10, 2026.

Discover carefully curated flight deals from Dulles Intl to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 10, 2026.

Last-minute flights from Dulles Intl to ColoradoDiscover last-minute flight deals from Dulles Intl to Colorado. Data last updated August 10, 2026 and is based on user searches.

Discover last-minute flight deals from Dulles Intl to Colorado. Data last updated August 10, 2026 and is based on user searches.

One-way flights from Dulles Intl to ColoradoSearch for one-way flight options from Dulles Intl to Colorado. Find affordable one-way fares based on user searches. Data last updated August 10, 2026.

Search for one-way flight options from Dulles Intl to Colorado. Find affordable one-way fares based on user searches. Data last updated August 10, 2026.

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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.

Cheapflights Insights

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

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 August 10, 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 10% on the flight price compared to flying in the morning, which is usually more expensive.

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

Airfare is below average for this route at the moment.

Washington, D.C. Dulles Intl Airport to Colorado flights typically cost between $373 and $549 in September.The cheapest round-trip price found within the last 5 days was $249 on Frontier (Sep 5-Sep 12).

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

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 August 8, 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. Monday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Colorado

Peruse reviews from past customers who have flown with Southwest,Delta, andUnited 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.

Related info for your journey

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Can I find deals for flights from Dulles Intl to Colorado that include hotel bookings?

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

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Dulles Intl and Colorado flights

Browse other Dulles Intl and Colorado flight options. Last updated on August 10, 2026.

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Dulles Intl to Colorado flights

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Top 6 airlines flying from Dulles Intl to Colorado

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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 August 10, 2026.

Best flights from Dulles Intl to Colorado
Discover carefully curated flight deals from Dulles Intl to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 10, 2026.

Last-minute flights from Dulles Intl to Colorado
Discover last-minute flight deals from Dulles Intl to Colorado. Data last updated August 10, 2026 and is based on user searches.

One-way flights from Dulles Intl to Colorado
Search for one-way flight options from Dulles Intl to Colorado. Find affordable one-way fares based on user searches. Data last updated August 10, 2026.

Washington, D.C. Dulles Intl Airport to Colorado flights typically cost between $373 and $549 in September.
The cheapest round-trip price found within the last 5 days was $249 on Frontier (Sep 5-Sep 12).