Denver International Airport
Denver, United StatesDEN / KDEN
International hub · 203 direct destinations · 6 runways · longest runway 16,001 ft
47 °F · ClearSource: METAR observation via the NOAA Aviation Weather Center
Route
Denver → Dulles
DEN
DenverDenver International Airport
DenverDenver International AirportIADDullesWashington Dulles International Airport
DullesWashington Dulles International Airport- Distance
- 1,449 mi
- Estimated flight time
- ~3h 25m
Dulles is currently 2 hours ahead of Denver.
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
- 8
- quietest month · Aug
- 2 hr 49 min
- measured flight time
- 12 / 12
- months seen
Through the year
Per day, month by month
- 9Jan2026
- 9Feb
- 9Mar
- 10Apr
- 10May
- 9Jun
- 9Jul
- 8Aug
- 8Sep
- 9Oct2025
- 9Nov
- 9Dec
Airlines
Who flies it
United Airlinesall year
Southwest Airlineswinter
Delta Air Linesnow and then
Through the day
Departure times
Local time in Denver. Most departures between 10:00 and 13:00.
- 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
- 9.2Mon
- 8.5Tue
- 8.1Wed
- 8.4Thu
- 9.2Fri
- 8.9Sat
- 8.9Sun
Fleet
Aircraft observed
- Airbus A321neoA21N35%
- Boeing 737-900B73925%
- Boeing 757-300B75310%
- Boeing 737 MAX 8B38M9%
- Boeing 737 MAX 9B39M7%
All the numbers in a table
| Month | Per day | Seen | Airlines |
|---|---|---|---|
| January 2026 | 9 | 252 |
|
| February 2026 | 9 | 255 |
|
| March 2026 | 9 | 286 |
|
| April 2026 | 10 | 273 |
|
| May 2026 | 10 | 285 |
|
| June 2026 | 9 | 255 |
|
| July 2026 | 9 | 268 |
|
| August 2026 | 8 | 248 |
|
| September 2026 | 8 | 240 |
|
| October 2025 | 9 | 281 |
|
| November 2025 | 9 | 264 |
|
| December 2025 | 9 | 258 |
|
Airlines observed on this route
From observed callsign routes on DEN-IAD - 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 Denver: 203.
- Direct destinations observed from Dulles: 171.
The airports on this route
Washington Dulles International Airport
Dulles, United StatesIAD / KIAD
International hub · 171 direct destinations · 4 runways · longest runway 11,499 ft
79 °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.
About the route from Denver to Dulles
The observed direct connection between Denver International Airport (DEN) and Washington Dulles International Airport (IAD) covers approximately 1,449 mi. The estimated flight time is around 3h 25m. Delta Air Lines, 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 Denver from Dulles by air?
- The great-circle distance between Denver International Airport and Washington Dulles International Airport is approximately 1,449 mi.
- How long is the flight from Denver to Dulles?
- 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 Denver to Dulles?
- Yes, a direct connection between DEN and IAD has been observed in our route data.
- Which airlines have been observed on this route?
- In the available route data: Delta Air Lines, Southwest Airlines and United Airlines.
- How often is there a flight from Denver to Dulles?
- On average around 9 flights a day, measured over twelve months (October 2025 to September 2026) in the flight archive, with 3,165 observed flights. Mainly United Airlines, Southwest Airlines, Delta Air Lines. That is an observation, not a timetable.
- What is the current time difference between Denver and Dulles?
- Dulles is currently 2 hours ahead of Denver.
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.