How does KAYAK find such low prices on flights from Colorado to Washington Dulles Airport?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Colorado to Washington Dulles Airport.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Colorado to Washington Dulles Airport?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from Colorado is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Colorado to Washington Dulles Airport?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Washington Dulles Airport with an airline and back to Colorado with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Colorado to Washington Dulles Airport?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington Dulles Airport from Colorado up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$117 CHEAP FLIGHTS from Colorado to Washington Dulles (IAD)

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Flight Deals

Cheap Flights from Colorado to Dulles Intl

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Colorado to Dulles Intl

Mon, Oct 12 - Mon, Oct 26

10:45 pm - 6:20 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

29h 35m1 stop Las Vegas Harry Reid Intl

9:06 pm - 8:22 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

13h 16m1 stop Atlanta Hartsfield-Jackson

$231Frontier

Sat, Nov 14 - Mon, Nov 16

9:20 pm - 11:36 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

12h 16m1 stop Dallas/Fort Worth

9:06 pm - 8:22 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

13h 16m1 stop Atlanta Hartsfield-Jackson

$231Frontier

Thu, Oct 29 - Tue, Nov 3

11:21 am - 12:51 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

23h 30m1 stop Tampa

9:06 pm - 8:22 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

13h 16m1 stop Atlanta Hartsfield-Jackson

$231Frontier

Thu, Oct 29 - Sat, Oct 31

7:34 pm - 2:45 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

17h 11m1 stop Valparaiso Destin-Ft Walton Beach

7:52 am - 9:32 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

15h 40m1 stop Atlanta Hartsfield-Jackson

$246Multiple Airlines

Thu, Oct 29 - Fri, Nov 6

7:34 pm - 2:45 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

17h 11m1 stop Valparaiso Destin-Ft Walton Beach

6:07 pm - 8:22 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

16h 15m2 stops Fort Lauderdale Atlanta Hartsfield-Jackson

$257Multiple Airlines

Thu, Oct 29 - Mon, Nov 2

7:34 pm - 2:45 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

17h 11m1 stop Valparaiso Destin-Ft Walton Beach

7:40 am - 9:30 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

15h 50m2 stops Atlanta Hartsfield-Jackson Lambert-St Louis

$260Multiple Airlines

Sat, Nov 14 - Sun, Nov 15

11:59 pm - 5:19 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 20mnonstop

8:20 am - 10:29 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

4h 09mnonstop

$334United Airlines

Sat, Oct 3 - Sun, Oct 4

11:52 pm - 5:17 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 25mnonstop

6:35 am - 8:28 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

3h 53mnonstop

$334United Airlines

Sat, Nov 14 - Wed, Nov 18

6:00 am - 1:54 pmCOS Colorado Springs-IAD Washington, D.C. Dulles Intl

5h 54m1 stop Atlanta Hartsfield-Jackson

8:00 am - 5:28 pmIAD Washington, D.C. Dulles Intl-COS Colorado Springs

11h 28m2 stops Atlanta Hartsfield-Jackson Salt Lake City

$360Delta

Wed, Oct 28 - Tue, Nov 3

6:00 am - 2:08 pmCOS Colorado Springs-IAD Washington, D.C. Dulles Intl

6h 08m1 stop Atlanta Hartsfield-Jackson

7:23 am - 5:27 pmIAD Washington, D.C. Dulles Intl-COS Colorado Springs

12h 04m2 stops Minneapolis St Paul Salt Lake City

$360Delta

Recent last minute flight deals from Colorado to Dulles Intl

Sat, Sep 19 - Sat, Oct 10

6:38 pm - 6:20 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

9h 42m1 stop Las Vegas Harry Reid Intl

12:30 pm - 9:49 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

11h 19m1 stop Dallas/Fort Worth

$303Frontier

Wed, Sep 16 - Wed, Sep 23

6:38 pm - 6:20 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

9h 42m1 stop Las Vegas Harry Reid Intl

6:00 am - 12:51 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

8h 51m1 stop Las Vegas Harry Reid Intl

$318Frontier

Sun, Sep 20 - Mon, Sep 28

9:43 am - 6:20 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

18h 37m1 stop Las Vegas Harry Reid Intl

12:30 pm - 9:49 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

11h 19m1 stop Dallas/Fort Worth

$320Frontier

Sat, Sep 19 - Sat, Oct 10

1:58 pm - 7:23 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 25mnonstop

4:12 pm - 6:09 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

3h 57mnonstop

$424United Airlines

Sat, Sep 19 - Sat, Oct 10

10:47 am - 9:30 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

8h 43m2 stops Dallas/Fort Worth Charlotte Douglas

3:08 pm - 7:44 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

6h 36m1 stop Dallas/Fort Worth

$447American Airlines

Fri, Sep 18 - Sun, Sep 20

5:41 pm - 5:40 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

9h 59m1 stop Seattle/Tacoma Intl

1:57 pm - 10:08 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

10h 11m1 stop Tampa

$450Multiple Airlines

Wed, Sep 16 - Wed, Sep 23

11:59 pm - 5:25 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 26mnonstop

10:34 pm - 12:30 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

3h 56mnonstop

$454United Airlines

Sun, Sep 20 - Mon, Sep 28

5:50 pm - 11:19 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 29mnonstop

6:35 am - 8:28 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

3h 53mnonstop

$454United Airlines

Wed, Sep 16 - Sun, Sep 20

7:41 am - 8:14 pmGJT Grand Junction Regnl-IAD Washington, D.C. Dulles Intl

10h 33m2 stops Salt Lake City Atlanta Hartsfield-Jackson

3:15 pm - 9:57 pmIAD Washington, D.C. Dulles Intl-GJT Grand Junction Regnl

8h 42m2 stops Atlanta Hartsfield-Jackson Salt Lake City

$591Delta

Thu, Sep 17 - Mon, Sep 21

1:25 pm - 9:44 pmCOS Colorado Springs-IAD Washington, D.C. Dulles Intl

6h 19m1 stop Atlanta Hartsfield-Jackson

6:00 am - 12:14 pmIAD Washington, D.C. Dulles Intl-COS Colorado Springs

8h 14m1 stop Atlanta Hartsfield-Jackson

$741Delta

Recent direct flight deals from Colorado to Dulles Intl

Sat, Nov 14 - Sun, Nov 15

11:59 pm - 5:19 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 20mnonstop

8:20 am - 10:29 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

4h 09mnonstop

$334United Airlines

Sat, Oct 3 - Sun, Oct 4

11:52 pm - 5:17 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 25mnonstop

6:35 am - 8:28 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

3h 53mnonstop

$334United Airlines

Sat, Nov 21 - Sun, Nov 22

11:59 pm - 5:19 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 20mnonstop

8:20 am - 10:29 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

4h 09mnonstop

$334United Airlines

Sat, Oct 24 - Thu, Oct 29

5:56 pm - 11:25 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 29mnonstop

12:40 pm - 2:48 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

4h 08mnonstop

$339United Airlines

Sat, Oct 3 - Sat, Oct 10

1:58 pm - 7:26 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 28mnonstop

5:27 pm - 7:31 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

4h 04mnonstop

$339United Airlines

Fri, Oct 16 - Tue, Oct 20

6:00 am - 11:25 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 25mnonstop

5:27 pm - 7:30 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

4h 03mnonstop

$339United Airlines

Fri, Oct 2 - Sat, Oct 10

6:00 am - 11:25 amDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 25mnonstop

4:12 pm - 6:09 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

3h 57mnonstop

$339United Airlines

Sat, Oct 10 - Tue, Oct 13

5:56 pm - 11:25 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 29mnonstop

10:34 pm - 12:30 amIAD Washington, D.C. Dulles Intl-DEN Denver Intl

3h 56mnonstop

$339United Airlines

Wed, Feb 10 - Sun, Feb 14

10:25 am - 3:50 pmDEN Denver Intl-IAD Washington, D.C. Dulles Intl

3h 25mnonstop

12:45 pm - 2:43 pmIAD Washington, D.C. Dulles Intl-DEN Denver Intl

3h 58mnonstop

$339United Airlines

Useful Info

Low season	January
High season	October
Cheapest flight	$117

Best time to beat the crowds with an average 4% drop in price.

Most popular time to fly and prices are also 12% lower on average.

Flight from Denver to Washington Dulles Airport

NesrinFlew with Southwest-Feb 2026

Get a seat in the very front if you can, otherwise, it is a very slow process.

JasonFlew with United Airlines-Nov 2024

DIA is a large airport. Get there early.

BindulFlew with United Airlines-Feb 2024

There are multiple flights between DEN and IAD everyday, including some wide bodies. Try and get on one of the wide bodies whenever possible.

How does KAYAK find such low prices on flights from Colorado to Washington Dulles Airport?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Colorado to Washington Dulles Airport.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Colorado to Washington Dulles Airport?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Washington Dulles Airport from Colorado is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Colorado to Washington Dulles Airport?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Washington Dulles Airport with an airline and back to Colorado with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Colorado to Washington Dulles Airport?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Washington Dulles Airport from Colorado up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Winchester

Linthicum Heights

Hanover

Springfield

Gaithersburg

Towson

Martinsburg

Oxon Hill

Owings Mills

Charles Town

Greenbelt

Glen Burnie

Edgewood

Chesapeake Beach

Camp Springs

Ellicott City

Pikesville

Hunt Valley

Colonial Beach

Capitol Heights

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IAD

$117 Find Cheap Flights from Colorado to Washington Dulles Airport - Compare and Save

Cheap Flights from Colorado to Dulles Intl

Recent round-trip flight deals from Colorado to Dulles Intl

Recent one-way flight deals from Colorado to Dulles Intl

Recent last minute flight deals from Colorado to Dulles Intl

Recent direct flight deals from Colorado to Dulles Intl

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Flights from Colorado to Dulles Intl: the best tips from KAYAK users

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