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

Southwest, Delta, and United 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 10m on average. Another popular route from Colorado to Washington, D.C. Dulles Intl Airport is flying from Colorado Springs 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 71% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 4 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 4 operators available for flights from Colorado to Washington, D.C. Dulles Intl Airport as of March 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.

$78 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 March 2026, 12 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 11:00AM, with 51% 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 March 2026, 89 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 Thu, with 30% of weekly flights taking off on this day.

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Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:59 pm - 10:22 am

DEN

IAD

8h 23m

1 stop

8:12 am - 2:31 pm

IAD

DEN

8h 19m

1 stop

$160Frontier

Sat, Apr 25 - Sat, May 2

1:09 pm - 12:36 am

DEN

IAD

9h 27m

1 stop

7:00 am - 12:09 pm

IAD

DEN

7h 09m

1 stop

$172Frontier

Tue, Apr 14 - Wed, Apr 15

6:30 am - 5:27 pm

DEN

IAD

8h 57m

1 stop

11:07 am - 9:05 am

IAD

DEN

23h 58m

1 stop

$173Frontier

Wed, May 27 - Sun, May 31

4:05 pm - 11:40 pm

COS

IAD

5h 35m

1 stop

6:20 am - 9:45 am

IAD

COS

5h 25m

1 stop

$235Southwest

Tue, May 5 - Tue, May 12

9:10 am - 11:40 pm

COS

IAD

12h 30m

2 stops

4:30 pm - 12:05 am

IAD

COS

9h 35m

1 stop

$240Southwest

Tue, May 5 - Mon, May 11

12:00 pm - 10:43 pm

MTJ

IAD

8h 43m

1 stop

10:13 am - 2:44 pm

IAD

MTJ

6h 31m

1 stop

$240United Airlines

Wed, May 27 - Sat, May 30

12:42 pm - 11:26 pm

MTJ

IAD

8h 44m

1 stop

7:00 am - 12:02 pm

IAD

MTJ

7h 02m

1 stop

$285American Airlines

Thu, May 7 - Tue, May 19

1:39 pm - 11:26 pm

COS

IAD

7h 47m

1 stop

7:00 am - 12:49 pm

IAD

COS

7h 49m

1 stop

$287American Airlines

Wed, Apr 15 - Mon, Apr 20

6:15 am - 2:04 pm

COS

IAD

5h 49m

1 stop

3:00 pm - 8:20 pm

IAD

COS

7h 20m

1 stop

$303Delta

Tue, Apr 14 - Thu, Apr 16

6:00 am - 1:14 pm

COS

IAD

5h 14m

1 stop

6:00 am - 11:24 am

IAD

COS

7h 24m

1 stop

$319United Airlines

Tue, Apr 14 - Fri, Apr 17

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

May 4

DEN11:59 pmDenver Intl

8h 13m

1 stop

IAD10:12 amWashington, D.C. Dulles Intl

May 8

IAD3:59 pmWashington, D.C. Dulles Intl

8h 40m

1 stop

DEN10:39 pmDenver Intl

$160

Frontier

Apr 14

DEN1:09 pmDenver Intl

9h 27m

1 stop

IAD12:36 amWashington, D.C. Dulles Intl

Apr 15

IAD7:00 amWashington, D.C. Dulles Intl

7h 09m

1 stop

DEN12:09 pmDenver Intl

$172

Frontier

Apr 30

DEN1:09 pmDenver Intl

9h 27m

1 stop

IAD12:36 amWashington, D.C. Dulles Intl

May 3

IAD7:11 pmWashington, D.C. Dulles Intl

18h 41m

1 stop

DEN11:52 amDenver Intl

$173

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

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

Southwest

Apr 20

DEN7:05 pmDenver Intl

3h 15m

IAD12:20 amWashington, D.C. Dulles Intl

Apr 21

IAD4:30 pmWashington, D.C. Dulles Intl

4h 00m

DEN6:30 pmDenver Intl

$215

Southwest

Apr 21

DEN6:10 pmDenver Intl

3h 30m

IAD11:40 pmWashington, D.C. Dulles Intl

Apr 28

IAD6:20 amWashington, D.C. Dulles Intl

3h 50m

DEN8:10 amDenver Intl

$217

Southwest

May 5

COS4:05 pmColorado Springs

5h 35m

1 stop

IAD11:40 pmWashington, D.C. Dulles Intl

May 12

IAD6:20 amWashington, D.C. Dulles Intl

5h 25m

1 stop

COS9:45 amColorado Springs

$235

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

Sat 4/25

11:59 pm-10:22 am

1 stop8h 23m

Washington, D.C. Dulles Intl

Sat 5/2

8:12 am-2:31 pm

1 stop8h 19m

$160

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Tue 4/14

1:09 pm-12:36 am

1 stop9h 27m

Washington, D.C. Dulles Intl

Wed 4/15

7:00 am-12:09 pm

1 stop7h 09m

$172

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 5/27

6:30 am-5:27 pm

1 stop8h 57m

Washington, D.C. Dulles Intl

Sun 5/31

11:07 am-9:05 am

1 stop23h 58m

$173

Quickest round-trip

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Tue 5/5

4:05 pm-11:40 pm

1 stop5h 35m

Washington, D.C. Dulles Intl

Tue 5/12

6:20 am-9:45 am

1 stop5h 25m

$235

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Tue 5/5

9:10 am-11:40 pm

2 stops12h 30m

Washington, D.C. Dulles Intl

Mon 5/11

4:30 pm-12:05 am

1 stop9h 35m

$240

MontroseWashington, D.C.

MTJ - IAD

MTJIAD

Montrose County

Wed 5/27

12:00 pm-10:43 pm

1 stop8h 43m

Washington, D.C. Dulles Intl

Sat 5/30

10:13 am-2:44 pm

1 stop6h 31m

$240

MontroseWashington, D.C.

MTJ - IAD

MTJIAD

Montrose County

Thu 5/7

12:42 pm-11:26 pm

1 stop8h 44m

Washington, D.C. Dulles Intl

Tue 5/19

7:00 am-12:02 pm

1 stop7h 02m

$285

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Wed 4/15

1:39 pm-11:26 pm

1 stop7h 47m

Washington, D.C. Dulles Intl

Mon 4/20

7:00 am-12:49 pm

1 stop7h 49m

$287

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Tue 4/14

6:15 am-2:04 pm

1 stop5h 49m

Washington, D.C. Dulles Intl

Thu 4/16

3:00 pm-8:20 pm

1 stop7h 20m

$303

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Tue 4/14

6:00 am-1:14 pm

1 stop5h 14m

Washington, D.C. Dulles Intl

Fri 4/17

6:00 am-11:24 am

1 stop7h 24m

$319

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, August 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 $287. If you aren’t able to travel to Washington, D.C. Dulles Intl Airport during the month of August, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $303.

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 $454. 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 $692.

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 $493 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 $625 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 Denver Intl 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 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 $343 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 $258 on momondo.

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

There are 4 cabin classes available to choose from on Colorado to Washington, D.C. Dulles Intl 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?

You could potentially save up to 7% on your flight if you consider stops on a Colorado to Washington, D.C. Dulles Intl Airport flight.

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	$235
Fastest flight time	3h 10m
Direct flights	Every day

The best one-way flight to Washington, D.C. Dulles Intl Airport from Colorado in the past 72 hours is $235. The best round-trip flight deal from Colorado to Washington, D.C. Dulles Intl Airport found on momondo in the last 72 hours is $388.

The fastest flight from Colorado to Washington, D.C. Dulles Intl Airport takes 3h 10m

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

Search flight deals

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 4 operators available for flights from Colorado to Washington, D.C. Dulles Intl Airport as of March 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 MAX 8, representing 16.15% of all bookings. The subsequent popular models are Airbus A321neo at 15.07%, Boeing 737-900 at 14.67%, and Boeing 737 MAX 9 at 11.82%.

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 $111	Free Cancellation	Rating 5.7 3,017 reviews	Search Frontier flights
Southwest	PriceFrom $177	Free Cancellation	Rating 8.0 4,333 reviews	Search Southwest flights
United Airlines	PriceFrom $200	Free Cancellation	Rating 7.4 9,479 reviews	Search United Airlines flights
Delta	PriceFrom $236	Free Cancellation	Rating 7.9 8,326 reviews	Search Delta flights

Alexandria

National Harbor

Gettysburg

Arlington

Winchester

Waldorf

Woodbridge

Laurel

Colonial Beach

Gaithersburg

Towson

Silver Spring

Fredericksburg

Rockville

Tysons

Manassas

Sterling

Linthicum Heights

Springfield

Bethesda

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 $78

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 6/11. 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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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

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

Our best Southwest 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 to Washington, D.C. Dulles Intl Airport?

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

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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