Washington Dulles International Airport
Dulles, United StatesIAD / KIAD
International hub · 171 direct destinations · 4 runways · longest runway 11,499 ft
72 °F · Partly cloudySource: METAR observation via the NOAA Aviation Weather Center
Route
Dulles → Denver
IAD
DullesWashington Dulles International Airport
DullesWashington Dulles International AirportDENDenverDenver International Airport
DenverDenver International Airport- Distance
- 1,449 mi
- Estimated flight time
- ~3h 25m
Denver is currently 2 hours behind Dulles.
Observed nonstop
How often does this route fly?
Frequency
Several times a day
On average around 9 flights a day, observed from October 2025 to September 2026.
- 9
- flights per day
- 10
- busiest month · Apr
- 7
- quietest month · Aug
- 3 hr 25 min
- measured flight time
- 12 / 12
- months seen
Through the year
Per day, month by month
- 8Jan2026
- 9Feb
- 9Mar
- 10Apr
- 10May
- 8Jun
- 9Jul
- 7Aug
- 8Sep
- 9Oct2025
- 9Nov
- 9Dec
Airlines
Who flies it
United Airlinesall year
Southwest Airlineswinter
Through the day
Departure times
Local time in Dulles. Most departures between 16:00 and 19:00.
- 00:00
- 01:00
- 02:00
- 03:00
- 04:00
- 05:00
- 06:00
- 07:00
- 08:00
- 09:00
- 10:00
- 11:00
- 12:00
- 13:00
- 14:00
- 15:00
- 16:00
- 17:00
- 18:00
- 19:00
- 20:00
- 21:00
- 22:00
- 23:00
Through the week
By weekday
- 8.7Mon
- 8.2Tue
- 7.8Wed
- 8.4Thu
- 9.1Fri
- 8.5Sat
- 8.8Sun
Fleet
Aircraft observed
- Boeing 737-900B73933%
- Airbus A321neoA21N32%
- Boeing 757-300B7539%
- Boeing 737 MAX 8B38M9%
- Boeing 737-800B7385%
All the numbers in a table
| Month | Per day | Seen | Airlines |
|---|---|---|---|
| January 2026 | 8 | 245 |
|
| February 2026 | 9 | 251 |
|
| March 2026 | 9 | 270 |
|
| April 2026 | 10 | 269 |
|
| May 2026 | 10 | 283 |
|
| June 2026 | 8 | 250 |
|
| July 2026 | 9 | 262 |
|
| August 2026 | 7 | 221 |
|
| September 2026 | 8 | 228 |
|
| October 2025 | 9 | 277 |
|
| November 2025 | 9 | 270 |
|
| December 2025 | 9 | 247 |
|
Airlines observed on this route
From observed callsign routes on IAD-DEN - not a booking guarantee.
About this route
- Domestic route: both airports are in the same country.
- The opposite direction has also been observed as a direct connection.
- Direct destinations observed from Dulles: 171.
- Direct destinations observed from Denver: 203.
The airports on this route
Denver International Airport
Denver, United StatesDEN / KDEN
International hub · 203 direct destinations · 6 runways · longest runway 16,001 ft
39 °F · ClearSource: METAR observation via the NOAA Aviation Weather Center
Alternative airports for this journey
Same journey, a different airport nearby - with an observed direct connection.
DCA DENRonald Reagan Washington National AirportWashington is about 24 mi from Dulles.View route →BWI DENBaltimore/Washington International Thurgood Marshall AirportBaltimore is about 45 mi from Dulles.View route →IAD COSCity of Colorado Springs Municipal AirportColorado Springs is about 73 mi from Denver.View route →
About the route from Dulles to Denver
The observed direct connection between Washington Dulles International Airport (IAD) and Denver International Airport (DEN) covers approximately 1,449 mi. The estimated flight time is around 3h 25m. Southwest Airlines and United Airlines have been observed on this connection in the available route data.
Frequently asked questions about this route
- How far is Dulles from Denver by air?
- The great-circle distance between Washington Dulles International Airport and Denver International Airport is approximately 1,449 mi.
- How long is the flight from Dulles to Denver?
- Based on the distance, the estimated flight time is about 3h 25m. This is an estimate, not a schedule.
- Is there a direct connection from Dulles to Denver?
- Yes, a direct connection between IAD and DEN has been observed in our route data.
- Which airlines have been observed on this route?
- In the available route data: Southwest Airlines and United Airlines.
- How often is there a flight from Dulles to Denver?
- On average around 9 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 3,073 observed flights. Mainly United Airlines, Southwest Airlines. That is an observation, not a timetable.
- What is the current time difference between Dulles and Denver?
- Denver is currently 2 hours behind Dulles.
Where this data comes from
The route data comes from the flight archive (ADS-B, adsb.lol): which connections actually flew over the last twelve full months and who flew them, combined with our own airport, runway, and airline datasets. It is reference data about observed routes - not a current timetable and no claim about bookability.
The frequency and aircraft on this page come from the flight archive (ADS-B, 12 months, October 2025 to September 2026), summarized per route per month. We do not see every flight, so it is a floor, not a count.
Route data updated on October 11, 2026.