What is the cheapest airline that flies from Colorado to Washington, D.C. Dulles Intl?

United Airlines, Delta, and American Airlines are the most popular carriers operating from Colorado to Washington, D.C. Dulles Intl

How long does it take to fly to Washington, D.C. Dulles Intl Airport?

Flight times from Colorado to Washington, D.C. Dulles Intl Airport vary, but if you’re flying out of Denver and flying into Washington, D.C. Dulles Intl Airport (one of the most popular routes), then the duration is 3h 18m on average. Another popular route from Colorado to Washington, D.C. Dulles Intl Airport is flying from Aspen to Washington, D.C. Dulles Intl Airport, which will take roughly 5h 35m. Keep in mind that layovers or delays could extend your travel time.

What airlines fly to Washington, D.C. Dulles Intl Airport?

United Airlines, Southwest and Frontier are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from Colorado according to our data. United Airlines is the first choice among our users, with 75% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 3 different airlines that fly to Washington, D.C. Dulles Intl Airport on a routine basis, so you have a few additional options to choose from.

How many operators does momondo search for flights from Colorado to Washington, D.C. Dulles Intl Airport?

There are 3 operators available for flights from Colorado to Washington, D.C. Dulles Intl Airport as of June 2026.

How old do you have to be to fly from Colorado to Washington, D.C. Dulles Intl Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Colorado to Washington, D.C. Dulles Intl Airport.

What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

The travel and health documents you'll need for your trip to Washington, D.C. Dulles Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington, D.C. Dulles Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$155 Cheap Flights from Colorado to Washington, D.C. Dulles Intl Airport in 2026

Q: How many flights depart from Colorado to Washington, D.C. Dulles Intl Airport on average per day?

As of June 2026, 22 flights take off from Colorado and land in Washington, D.C. Dulles Intl Airport each day. The most common flight departure time for this route is 8:00AM, with 55% of daily flights taking off at noon.

Q: How many flights depart from Colorado to Washington, D.C. Dulles Intl Airport on average per week?

As of June 2026, 157 flights take off from Colorado and land in Washington, D.C. Dulles Intl Airport each week. The most common flight departure day for this route is Fri, with 15% of weekly flights taking off on this day.

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Colorado to Washington, D.C.

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:25 pm - 8:20 am

DEN

IAD

13h 55m

1 stop

9:50 am - 6:00 pm

IAD

DEN

10h 10m

1 stop

$302Frontier

Mon, Jul 6 - Wed, Jul 15

10:59 am - 12:28 am

DEN

IAD

11h 29m

2 stops

9:16 pm - 2:00 pm

IAD

DEN

18h 44m

1 stop

$303Frontier

Sat, Sep 19 - Sun, Sep 27

6:30 am - 4:40 pm

DEN

IAD

8h 10m

1 stop

7:49 am - 3:54 pm

IAD

DEN

10h 05m

2 stops

$305Frontier

Thu, Jul 23 - Wed, Jul 29

6:30 am - 12:28 am

DEN

IAD

15h 58m

1 stop

9:16 pm - 2:00 pm

IAD

DEN

18h 44m

1 stop

$306Frontier

Sun, Sep 13 - Sun, Sep 27

11:58 am - 10:45 pm

MTJ

IAD

8h 47m

1 stop

10:10 am - 2:27 pm

IAD

MTJ

6h 17m

1 stop

$330United Airlines

Wed, Sep 2 - Sun, Sep 6

10:23 am - 5:58 pm

COS

IAD

5h 35m

1 stop

6:15 am - 10:33 am

IAD

COS

6h 18m

1 stop

$333United Airlines

Wed, Aug 5 - Wed, Aug 12

6:00 am - 2:05 pm

COS

IAD

6h 05m

1 stop

11:10 am - 9:38 pm

IAD

COS

12h 28m

2 stops

$338Delta

Wed, Aug 5 - Wed, Aug 12

1:20 pm - 8:55 pm

COS

IAD

5h 35m

1 stop

6:00 am - 10:47 am

IAD

COS

6h 47m

1 stop

$354Delta

Thu, Aug 6 - Tue, Aug 11

10:31 am - 8:24 pm

ASE

IAD

7h 53m

1 stop

6:52 am - 12:21 pm

IAD

ASE

7h 29m

1 stop

$355American Airlines

Fri, Sep 11 - Sun, Sep 13

5:40 am - 2:02 pm

COS

IAD

6h 22m

1 stop

6:09 am - 2:54 pm

IAD

COS

10h 45m

1 stop

$393American Airlines

Wed, Sep 2 - Tue, Sep 8

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Delta flights from Colorado to Washington, D.C. Dulles Intl Airport

Our best Delta deals on Colorado to Washington, D.C. Dulles Intl Airport flight tickets

Delta

Aug 5

COS6:00 amColorado Springs

6h 05m

1 stop

IAD2:05 pmWashington, D.C. Dulles Intl

Aug 12

IAD6:00 amWashington, D.C. Dulles Intl

6h 47m

1 stop

COS10:47 amColorado Springs

$333

Delta

Aug 5

COS6:00 amColorado Springs

6h 05m

1 stop

IAD2:05 pmWashington, D.C. Dulles Intl

Aug 12

IAD11:10 amWashington, D.C. Dulles Intl

12h 28m

2 stops

COS9:38 pmColorado Springs

$338

Delta

Oct 24

COS8:00 amColorado Springs

14h 20m

2 stops

IAD12:20 amWashington, D.C. Dulles Intl

Oct 27

IAD6:10 amWashington, D.C. Dulles Intl

8h 48m

2 stops

COS12:58 pmColorado Springs

$343

Frontier flights from Colorado to Washington, D.C. Dulles Intl Airport

Our best Frontier deals on Colorado to Washington, D.C. Dulles Intl Airport flight tickets

Frontier

Jul 6

DEN4:25 pmDenver Intl

13h 55m

1 stop

IAD8:20 amWashington, D.C. Dulles Intl

Jul 15

IAD9:50 amWashington, D.C. Dulles Intl

10h 10m

1 stop

DEN6:00 pmDenver Intl

$302

Frontier

Sep 19

DEN10:59 amDenver Intl

11h 29m

2 stops

IAD12:28 amWashington, D.C. Dulles Intl

Sep 27

IAD9:16 pmWashington, D.C. Dulles Intl

18h 44m

1 stop

DEN2:00 pmDenver Intl

$303

Frontier

Jul 23

DEN6:30 amDenver Intl

8h 10m

1 stop

IAD4:40 pmWashington, D.C. Dulles Intl

Jul 29

IAD7:49 amWashington, D.C. Dulles Intl

10h 05m

2 stops

DEN3:54 pmDenver Intl

$305

momondo Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Mon 7/6

4:25 pm-8:20 am

1 stop13h 55m

Washington, D.C. Dulles Intl

Wed 7/15

9:50 am-6:00 pm

1 stop10h 10m

$302

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sat 9/19

10:59 am-12:28 am

2 stops11h 29m

Washington, D.C. Dulles Intl

Sun 9/27

9:16 pm-2:00 pm

1 stop18h 44m

$303

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Thu 7/23

6:30 am-4:40 pm

1 stop8h 10m

Washington, D.C. Dulles Intl

Wed 7/29

7:49 am-3:54 pm

2 stops10h 05m

$305

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Sun 9/13

6:30 am-12:28 am

1 stop15h 58m

Washington, D.C. Dulles Intl

Sun 9/27

9:16 pm-2:00 pm

1 stop18h 44m

$306

MontroseWashington, D.C.

MTJ - IAD

MTJIAD

Montrose County

Wed 9/2

11:58 am-10:45 pm

1 stop8h 47m

Washington, D.C. Dulles Intl

Sun 9/6

10:10 am-2:27 pm

1 stop6h 17m

$330

Quickest round-trip

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Wed 8/5

10:23 am-5:58 pm

1 stop5h 35m

Washington, D.C. Dulles Intl

Wed 8/12

6:15 am-10:33 am

1 stop6h 18m

$333

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Wed 8/5

6:00 am-2:05 pm

1 stop6h 05m

Washington, D.C. Dulles Intl

Wed 8/12

11:10 am-9:38 pm

2 stops12h 28m

$338

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Thu 8/6

1:20 pm-8:55 pm

1 stop5h 35m

Washington, D.C. Dulles Intl

Tue 8/11

6:00 am-10:47 am

1 stop6h 47m

$354

AspenWashington, D.C.

ASE - IAD

ASEIAD

Aspen Pitkin County

Fri 9/11

10:31 am-8:24 pm

1 stop7h 53m

Washington, D.C. Dulles Intl

Sun 9/13

6:52 am-12:21 pm

1 stop7h 29m

$355

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Wed 9/2

5:40 am-2:02 pm

1 stop6h 22m

Washington, D.C. Dulles Intl

Tue 9/8

6:09 am-2:54 pm

1 stop10h 45m

$393

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Colorado to Washington, D.C. Dulles Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Washington, D.C. Dulles Intl Airport?

In general, November is the cheapest month to fly from Colorado to Washington, D.C. Dulles Intl Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $98. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of November, then flying in December is also cheap. Prices for this month can be found on momondo for an average of $111.

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Our data shows that Thursday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $508. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Colorado to Washington, D.C. Dulles Intl Airport for around $698.

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Flying to Washington, D.C. Dulles Intl Airport from Colorado in the morning is the least expensive time of day to depart. momondo users have found prices as low as $542 when looking at flights departing in the morning. If you have a flexible travel schedule, then try to avoid flying in the evening when prices are $745 on average. Flights to Washington, D.C. Dulles Intl Airport from Colorado in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Colorado to Washington, D.C. Dulles Intl flight route?

Fly from Vail Eagle County to Washington, D.C. Dulles Intl for the best Colorado - Washington, D.C. Dulles Intl flight prices

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

You are more likely to see cheaper flights to Washington, D.C. Dulles Intl Airport from Colorado when booking weeks ahead of your departure date. In general, you can expect to find flights to Washington, D.C. Dulles Intl Airport for around $389 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Washington, D.C. Dulles Intl Airport from Colorado for as low as $320 on momondo.

What cabin class options are available on Colorado to Washington, D.C. Dulles Intl Airport flights?

There are 4 cabin classes available to choose from on Colorado to Washington, D.C. Dulles Intl Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Colorado to Washington, D.C. Dulles Intl Airport flights?

No. A direct flight is the cheapest option for a flight between Colorado to Washington, D.C. Dulles Intl Airport.

Cheap Colorado to Washington, D.C. Dulles Intl Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Colorado to Washington, D.C. Dulles Intl Airport

Best Price Found	$272
Fastest flight time	3h 18m
Direct flights	Every day

The best one-way flight to Washington, D.C. Dulles Intl Airport from Colorado in the past 72 hours is $272. The best round-trip flight deal from Colorado to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $512.

The fastest flight from Colorado to Washington, D.C. Dulles Intl Airport takes 3h 18m

Direct flights go from Colorado to Washington, D.C. Dulles Intl Airport every day.

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Frequently asked questions about flying from Colorado to Washington, D.C. Dulles Intl Airport

When did momondo last update prices for flights from Colorado to Washington, D.C. Dulles Intl Airport?
Prices for flights from Colorado to Washington, D.C. Dulles Intl Airport refresh daily.
How many operators does momondo search for flights from Colorado to Washington, D.C. Dulles Intl Airport?
There are 3 operators available for flights from Colorado to Washington, D.C. Dulles Intl Airport as of June 2026.
How old do you have to be to fly from Colorado to Washington, D.C. Dulles Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Colorado to Washington, D.C. Dulles Intl Airport.
What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?
The travel and health documents you'll need for your trip to Washington, D.C. Dulles Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Washington, D.C. Dulles Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Colorado to Washington, D.C. Dulles Intl Airport?
momondo data reveals that the most frequently booked plane model on the route from Colorado to Washington, D.C. Dulles Intl Airport is Boeing 737-900, representing 18.36% of all bookings. The subsequent popular models are Airbus A321neo at 17.65%, Boeing 737 MAX 8 at 13.86%, and Boeing 757-300 at 12.43%.

Best airlines flying from Colorado to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from Colorado to Washington, D.C. Dulles Intl Airport with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $131	Free Cancellation	Rating 5.6 2,864 reviews	Search Frontier flights
Southwest	PriceFrom $177	Free Cancellation	Rating 7.9 4,245 reviews	Search Southwest flights
United Airlines	PriceFrom $217	Free Cancellation	Rating 7.4 9,893 reviews	Search United Airlines flights

Alexandria

National Harbor

Arlington

Gettysburg

Winchester

Waldorf

Laurel

Woodbridge

Fredericksburg

Gaithersburg

Colonial Beach

Linthicum Heights

Rockville

Silver Spring

Towson

Manassas

Sterling

Tysons

Springfield

Fairfax

Why use momondo?

Why should I use momondo to find a flight deal from Colorado to Washington, D.C.?

Finding the right flight to Washington, D.C. from Colorado is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Washington, D.C. quick and easy, saving you time and money.

Can I find flights from Colorado to Washington, D.C. with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Washington, D.C. from Colorado with this policy.

How can momondo help me find flights from Colorado to Washington, D.C.?

momondo provides multiple filters to help you find the best flight to Washington, D.C. from Colorado. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Colorado to Washington, D.C. right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Washington, D.C., momondo offers a useful price alert feature which will track prices for flights to Washington, D.C. from Colorado and alert you when they change.

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Cheap flights from Colorado to Washington, D.C. from $155

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Colorado to Washington, D.C. departing on 9/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Delta flights from Colorado to Washington, D.C. Dulles Intl Airport

Our best Delta deals on Colorado to Washington, D.C. Dulles Intl Airport flight tickets

Frontier flights from Colorado to Washington, D.C. Dulles Intl Airport

Our best Frontier deals on Colorado to Washington, D.C. Dulles Intl Airport flight tickets

momondo Fare Finder

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

See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Colorado to Washington, D.C. Dulles Intl Airport

What is the cheapest month to fly to Washington, D.C. Dulles Intl Airport?

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

What is the cheapest Colorado to Washington, D.C. Dulles Intl flight route?

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

What cabin class options are available on Colorado to Washington, D.C. Dulles Intl Airport flights?

Can stopping save me money on Colorado to Washington, D.C. Dulles Intl Airport flights?

What is the cheapest airline that flies from Colorado to Washington, D.C. Dulles Intl?

What airlines fly to Washington, D.C. Dulles Intl Airport?

How many flights depart from Colorado to Washington, D.C. Dulles Intl Airport on average per day?

How many flights depart from Colorado to Washington, D.C. Dulles Intl Airport on average per week?

How long does it take to fly to Washington, D.C. Dulles Intl Airport?

Cheap Colorado to Washington, D.C. Dulles Intl Airport flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Colorado to Washington, D.C. Dulles Intl Airport

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Colorado to Washington, D.C. Dulles Intl Airport

Best airlines flying from Colorado to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from Colorado to Washington, D.C. Dulles Intl Airport with momondo

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List of cabin classes available on flights landing in Washington, D.C.. Availability may vary depending on flight origin and airline.

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