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Dulles Intl

$84+ Cheap flights from Colorado to Dulles Intl (IAD)

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 1/10. Fares are subject to change and may not be available on all flights or dates of travel.
DEN — IAD
Dec 27 — Jan 31
Fri 12/27
Fri 1/3
1 adult, Economy
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Cheap flight deals from Colorado to Dulles Intl

Discover tips and strategies to find the most affordable flight options for your journey from Colorado (USCO) to Dulles Intl (IAD). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated December 22, 2024.

Round-trip from

$133
(Mytrip)

One-way from

$84
(Trip.com)
From Colorado to Washington, D.C. Dulles Intl
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One-way flight from Colorado to Washington, D.C. Dulles Intl
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Find flight deals from Colorado to Dulles Intl

Cheapest flights from Colorado to Dulles Intl
Explore the most affordable flight options available from Colorado to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 22, 2024.

This Frontier deal was found by Cheapflights users on 12/21. 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 12/265:10 amDEN - IAD
1 stop10h 48mFrontier
Mon 1/63:24 pmIAD - DEN
1 stop10h 10mFrontier
Deal found 12/21$298
This American Airlines deal was found by Cheapflights users on 12/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3110:22 amDEN - IAD
1 stop7h 12mAmerican Airlines
Tue 1/75:00 amIAD - DEN
1 stop6h 23mAmerican Airlines
Deal found 12/21$462
This Southwest deal was found by Cheapflights users on 12/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/315:45 pmDEN - IAD
Nonstop3h 15mSouthwest
Tue 1/75:50 pmIAD - DEN
Nonstop4h 05mSouthwest
Deal found 12/21$465
This Delta deal was found by Cheapflights users on 12/19. 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.
Thu 12/261:24 pmHDN - IAD
1 stop6h 16mDelta
Mon 12/306:00 amIAD - HDN
2 stops10h 19mDelta
Deal found 12/19$495
This United deal was found by Cheapflights users on 12/21. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/231:45 pmDEN - IAD
Nonstop3h 19mUnited Airlines
Sat 1/115:20 pmIAD - DEN
Nonstop4h 08mUnited Airlines
Deal found 12/21$508
This United deal was found by Cheapflights users on 12/21. 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 United is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/281:10 pmASE - IAD
1 stop8h 15mUnited Airlines
Sat 1/46:30 amIAD - ASE
1 stop6h 25mUnited Airlines
Deal found 12/21$538
This Delta deal was found by Cheapflights users on 12/22. 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.
Sat 12/2812:37 pmASE - IAD
1 stop7h 03mDelta
Sun 1/56:00 amIAD - ASE
1 stop7h 57mDelta
Deal found 12/22$543
This United Airlines deal was found by Cheapflights users on 12/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/231:25 pmDRO - IAD
1 stop8h 00mUnited Airlines
Tue 12/316:35 amIAD - DRO
1 stop7h 54mUnited Airlines
Deal found 12/21$553
This American Airlines deal was found by Cheapflights users on 12/19. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/2612:13 pmHDN - IAD
2 stops9h 49mAmerican Airlines
Mon 12/305:00 amIAD - HDN
2 stops8h 43mAmerican Airlines
Deal found 12/19$566
This Delta deal was found by Cheapflights users on 12/21. 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.
Fri 12/276:00 amDEN - IAD
1 stop5h 56mDelta
Sat 1/46:07 amIAD - DEN
1 stop6h 06mDelta
Deal found 12/21$582
This United Airlines deal was found by Cheapflights users on 12/21. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/299:38 amCOS - IAD
1 stop7h 28mUnited Airlines
Wed 1/15:35 pmIAD - COS
1 stop6h 28mUnited Airlines
Deal found 12/21$588
This Southwest deal was found by Cheapflights users on 12/21. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/276:15 pmCOS - IAD
1 stop4h 45mSouthwest
Sat 1/45:05 amIAD - COS
1 stop10h 35mSouthwest
Deal found 12/21$603

Find flights from Colorado to Dulles Intl within your budget

Customize your flight search to find flights from Colorado to Dulles Intl 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 December 22, 2024.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Wed 1/22

12:50 am-5:57 pm

1 stop15h 07m

Washington, D.C. Dulles Intl

Sun 1/26

5:57 pm-11:40 pm

1 stop7h 43m

$133

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Tue 2/4

8:00 am-1:23 pm

Nonstop3h 23m

Washington, D.C. Dulles Intl

Tue 2/11

8:33 am-10:35 am

Nonstop4h 02m

$177

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Mon 1/20

6:43 pm-11:34 am

1 stop14h 51m

Washington, D.C. Dulles Intl

Mon 1/27

6:05 pm-11:40 pm

1 stop7h 35m

$235

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Tue 2/4

3:55 pm-11:13 pm

1 stop5h 18m

Washington, D.C. Dulles Intl

Mon 2/10

10:03 am-2:25 pm

1 stop6h 22m

$236

HaydenWashington, D.C.

HDN - IAD

HDNIAD

Hayden Yampa Valley

Thu 2/27

4:45 pm-4:18 pm

1 stop21h 33m

Washington, D.C. Dulles Intl

Wed 3/5

5:18 pm-4:05 pm

1 stop24h 47m

$256

DenverWashington, D.C.

DEN - IAD

DENIAD

Denver Intl

Fri 1/17

6:00 pm-11:20 pm

Nonstop3h 20m

Washington, D.C. Dulles Intl

Sun 1/19

5:50 pm-7:55 pm

Nonstop4h 05m

$258

Colorado SpringsWashington, D.C.

COS - IAD

COSIAD

Colorado Springs

Wed 2/19

12:36 pm-10:33 pm

1 stop7h 57m

Washington, D.C. Dulles Intl

Mon 2/24

6:12 am-1:41 pm

1 stop9h 29m

$263

HaydenWashington, D.C.

HDN - IAD

HDNIAD

Hayden Yampa Valley

Thu 2/27

1:53 pm-12:20 am

1 stop8h 27m

Washington, D.C. Dulles Intl

Wed 3/5

6:00 am-2:52 pm

2 stops10h 52m

$277

GunnisonWashington, D.C.

GUC - IAD

GUCIAD

Gunnison

Wed 1/22

12:31 pm-10:41 pm

1 stop8h 10m

Washington, D.C. Dulles Intl

Tue 1/28

6:10 am-11:46 am

1 stop7h 36m

$288

Grand JunctionWashington, D.C.

GJT - IAD

GJTIAD

Grand Junction Regnl

Fri 2/21

1:25 pm-11:34 pm

1 stop8h 09m

Washington, D.C. Dulles Intl

Mon 2/24

7:20 am-12:48 pm

1 stop7h 28m

$288

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/21

Showing 1-10 of 50 results
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Best time to book a flight from Colorado to Dulles Intl

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Colorado 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.

Travel insights for flights from Colorado to Dulles Intl

Get recent, data-driven insights about flights from Colorado to Dulles Intl including ideal travel times, pricing trends, and more.

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

Currently, August is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Colorado to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $389). 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 CO to IAD?

Find hourly flight availability from Colorado to Dulles Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 22, 2024.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Colorado to Washington, D.C. Dulles Intl Airport as you normally would.

Weekly flight availability from Colorado to Washington, D.C. Dulles Intl Airport

Explore weekly flight availability from Colorado to Dulles Intl. 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 December 22, 2024.

The most flights from USCO to IAD are scheduled on a Sunday (23 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (17 on average).

Rainfall in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

Temperature in Dulles Intl by month

Plan your trip to Dulles Intl by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

Reviews of airlines servicing Dulles Intl

Get insights into the airlines that provide service to Dulles Intl. 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 Dulles Intl. Reviews last updated December 22, 2024.
See what other customers who have flown with United Airlines, Delta and American Airlines from Colorado to Washington, D.C. have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.1
Very good
4,804 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Southwest
8.1
Very good
4,804 reviews
Southwest
8.1
Very good
4,804 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Alaska Airlines
8.0
Very good
9,537 reviews
Southwest
8.1
Very good
4,804 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Delta
8.0
Very good
8,594 reviews
Southwest
8.1
Very good
4,804 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

United Airlines
7.4
Good
9,028 reviews
Southwest
8.1
Very good
4,804 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Allegiant Air
7.4
Good
823 reviews
Southwest
8.1
Very good
4,804 reviews

Food

7.2

Boarding

8.2

Comfort

8.1

Crew

8.7

Entertainment

7.7

Overall

8.1

Reviews

1 / 10

We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.

Related info for your journey

Find useful and relevant information for your journey from Colorado to Dulles Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from Colorado to Washington, D.C. Dulles Intl Airport one-way?

    The cheapest airlines for a one-way flight from Colorado to Washington, D.C. Dulles Intl Airport are Frontier ($84), Southwest ($89), and United Airlines ($109).

  • What are the most popular routes from Colorado to Washington, D.C. Dulles Intl Airport?

    The most popular route from Colorado to Washington, D.C. Dulles Intl Airport is Denver Intl - Washington, D.C. Dulles Intl. You may also consider Colorado Springs - Washington, D.C. Dulles Intl or Grand Junction Regnl - Washington, D.C. Dulles Intl.

  • What are the most reliable airlines from Colorado to Washington, D.C. Dulles Intl Airport?

    Consider Ethiopian Air (91%), Copa Airlines (89%) or United Airlines (89%) when booking your flight. These represent the most reliable airlines when flying from Colorado to Washington, D.C. Dulles Intl Airport.

  • What are the cheapest flights from Colorado to Washington, D.C. Dulles Intl Airport?

    Looking at all options, your cheapest flight can be booked for $129. While the most popular route (Denver Intl - Washington, D.C. Dulles Intl) can be booked for $177 on average our data indicates $961 when flying from Colorado to Washington, D.C. Dulles Intl Airport.

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

    Yes. In addition to deals on Colorado to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Colorado to Dulles Intl?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to Dulles Intl.

  • Can I find deals for business class flights from Colorado to Dulles Intl?

    Yes. Cheapflights offers flight deals from Colorado to Dulles Intl 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 Colorado to Washington, D.C. Dulles Intl Airport?

    Currently, August is the cheapest month in which you can book a flight from Colorado to Washington, D.C. Dulles Intl Airport (average of $309). Flying from Colorado to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $389). 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.

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Alternative routes for Colorado to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
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Seattle to Baltimore flights
Minneapolis to Baltimore flights
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Detroit to Baltimore flights
Miami to Dulles Intl flights
John F Kennedy Intl to Reagan-National flights
Miami to Reagan-National flights
Minneapolis to Dulles Intl flights
Austin to Dulles Intl flights
LaGuardia to Reagan-National flights
Denver to Reagan-National flights
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Detroit to Reagan-National flights
Sky Harbor Intl to Dulles Intl flights
Fort Lauderdale to Reagan-National flights
Miami to Baltimore flights

Top 5 airlines flying from Colorado to Dulles Intl

Discover the top 5 airlines that operate flights from Colorado to Dulles Intl. 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 December 22, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$107Average$229FlexibilityNo cancel feeOn-time62%
DeltaCheapest$134Average$380FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$203Average$529FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$218Average$331FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$227Average$501FlexibilityNo cancel feeOn-time71%
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