$67+ 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 1/20. Fares are subject to change and may not be available on all flights or dates of travel.
IAD — DEN
Jan 11 — Jan 181
1 adult, Economy
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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 December 12, 2025.
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 December 12, 2025.
This eDestinos deal was found by Cheapflights users on 12/9. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:01 pmIAD - DEN
2 stops30h 12mFrontier
Sat 1/106:50 amDEN - IAD
2 stops46h 50mFrontier
Deal found 12/9![Frontier logo]()
$230
This Frontier deal was found by Cheapflights users on 12/9. 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.
Sat 12/139:20 pmIAD - DEN
1 stop13h 04mFrontier
Mon 12/1512:59 amDEN - IAD
1 stop11h 30mFrontier
Deal found 12/9![Frontier logo]()
$233
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/154:00 pmIAD - DEN
1 stop18h 43mFrontier
Wed 12/1711:59 pmDEN - IAD
1 stop6h 47mFrontier
Deal found 12/10![Frontier logo]()
$234
This Kiwi.com deal was found by Cheapflights users on 12/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:58 pmIAD - DEN
2 stops35h 35mFrontier
Fri 1/166:13 pmDEN - IAD
1 stop14h 54mFrontier
Deal found 12/10![Frontier logo]()
$240
This Gotogate deal was found by Cheapflights users on 12/9. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/229:58 pmIAD - DEN
1 stop27h 06mFrontier
Wed 1/76:00 amDEN - IAD
1 stop8h 50mFrontier
Deal found 12/9![Frontier logo]()
$241
This Trip.com deal was found by Cheapflights users on 12/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/299:58 pmIAD - DEN
1 stop27h 06mFrontier
Thu 1/812:13 pmDEN - IAD
1 stop6h 43mFrontier
Deal found 12/9![Frontier logo]()
$251
This CheapOair deal was found by Cheapflights users on 12/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:21 amIAD - DEN
1 stop25h 49mFrontier
Wed 12/1711:59 pmDEN - IAD
1 stop6h 47mFrontier
Deal found 12/9![Frontier logo]()
$254
This CheapOair deal was found by Cheapflights users on 12/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/139:20 pmIAD - DEN
1 stop13h 04mFrontier
Sat 12/2011:59 pmDEN - IAD
1 stop13h 54mFrontier
Deal found 12/10![Frontier logo]()
$259
This Frontier deal was found by Cheapflights users on 12/10. 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.
Sat 12/139:20 pmIAD - DEN
1 stop13h 04mFrontier
Fri 1/96:00 amDEN - IAD
1 stop8h 46mFrontier
Deal found 12/10![Frontier logo]()
$268
This Kiwi.com deal was found by Cheapflights users on 12/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/218:16 pmIAD - DEN
1 stop24h 01mMultiple Airlines
Sun 1/411:59 pmDEN - IAD
2 stops33h 29mMultiple Airlines
Deal found 12/11![Multiple Airlines logo]()
$277
This United Airlines deal was found by Cheapflights users on 12/11. 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.
Tue 12/236:30 amIAD - HDN
1 stop6h 57mUnited Airlines
Tue 12/3011:38 amHDN - IAD
1 stop7h 16mUnited Airlines
Deal found 12/11![United Airlines logo]()
$351
This United Airlines deal was found by Cheapflights users on 12/11. 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.
Tue 12/162:30 pmIAD - HDN
1 stop7h 38mUnited Airlines
Sat 1/104:06 pmHDN - IAD
Nonstop3h 43mUnited Airlines
Deal found 12/11![United Airlines logo]()
$352
Find flight deals from Dulles Intl to Colorado
Keep the following information in mind while searching for Dulles Intl to Colorado flight deals. Data was last updated December 12, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $142 (Kiwi.com) |
One-way from | $67 (Kiwi.com) |
Popular in | December |
Cheapest in | August |
Average price | $358 |
Good round-trip deal | $364 or less |
Good one-way deal | $201 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Dulles Intl to Colorado 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 12, 2025.
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
Dulles Intl
Fly to
Colorado
Route
Depart
Return
Price
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Wed 2/11
10:32 pm-12:30 am
Nonstop3h 58m
Denver Intl
Sat 2/14
11:59 pm-5:18 am
Nonstop3h 19m
$177
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Wed 2/18
7:42 pm-9:47 pm
Nonstop4h 05m
Denver Intl
Sun 2/22
6:00 am-11:20 am
Nonstop3h 20m
$197
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Sat 1/10
8:15 am-10:27 am
Nonstop4h 12m
Denver Intl
Thu 1/15
11:59 pm-5:21 am
Nonstop3h 22m
$197
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Wed 2/11
6:00 am-10:08 am
1 stop6h 08m
Denver Intl
Sat 2/14
6:10 am-4:28 pm
1 stop8h 18m
$217
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Fri 1/9
9:05 am-11:15 am
Nonstop4h 10m
Denver Intl
Fri 1/16
5:25 pm-10:40 pm
Nonstop3h 15m
$217
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Wed 2/11
7:30 pm-12:28 am
1 stop6h 58m
Denver Intl
Tue 2/17
6:10 am-4:28 pm
1 stop8h 18m
$217
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Thu 1/15
5:30 am-7:30 am
Nonstop4h 00m
Denver Intl
Sun 1/18
4:45 pm-9:55 pm
Nonstop3h 10m
$217
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Fri 2/6
10:32 pm-12:32 am
Nonstop4h 00m
Denver Intl
Mon 2/9
11:59 pm-5:21 am
Nonstop3h 22m
$217
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Fri 2/20
3:25 pm-11:40 pm
1 stop10h 15m
Denver Intl
Tue 2/24
10:35 am-3:50 pm
Nonstop3h 15m
$227
Washington, D.C.Denver
IAD - DEN
IADDEN
Washington, D.C. Dulles Intl
Wed 1/21
5:30 pm-7:35 pm
Nonstop4h 05m
Denver Intl
Wed 1/28
7:55 am-4:50 pm
1 stop6h 55m
$227
Showing 1-10 of 60 results
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.
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
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 $143). Flying from Washington, D.C. Dulles Intl Airport to Colorado in April is currently the most expensive (average of $243). 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?
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 December 12, 2025.
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 at noon, which is usually more expensive.
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 December 16, 2024.
Travelers seeking maximum savings on their Washington, D.C. Dulles Intl Airport to Colorado flight should consider departing on Saturday afternoons when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Washington, D.C. Dulles Intl Airport to Colorado
Explore weekly flight availability from Dulles Intl to Colorado. 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 12, 2025.
The most flights from IAD to USCO are scheduled on a Monday (23 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (14 on average).
Reviews of airlines servicing Colorado
Get insights into the airlines that provide service to Colorado. 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 Colorado. Reviews last updated December 12, 2025.
Peruse reviews from past customers who have flown with Southwest, Delta, and United 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.
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Entertainment
7.5
Food
7.0
Boarding
8.1
Comfort
8.0
Crew
8.6
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Dulles Intl to Colorado. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Dulles Intl to Colorado
See prices for flight routes from nearby airports that may be better suited for you.
Top 5 airlines flying from Dulles Intl to Colorado
Discover the top 5 airlines that operate flights from Dulles Intl to Colorado. 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 12, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$106 | Average$251 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$160 | Average$362 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$178 | Average$334 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$215 | Average$488 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$236 | Average$295 | FlexibilityNo cancel fee | On-timeN/A |