Denver (DEN) to Dulles (IAD)
Flight time
≈ 3h 42m
Bearing
84° E
Denver (DEN) to Dulles (IAD) is 1,449 miles (2,332 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies DEN–IAD
Filed traffic dataIn May 2026, United Airlines operated the most departures, one of 3 carriers flying nonstop DEN–IAD; the Airbus A321neo was the most common aircraft at 38% of departures; flights ran 85% full.
Departures
633
May 2026
Seats
122,588
both directions
Passengers
104,505
both directions
Load factor
85.3%
RPM ÷ ASM
Who flies DEN–IAD?
United Airlines operated the most nonstop DEN–IAD departures in May 2026 (507), one of 3 carriers on the route.
- UA
507 departures · 100,777 seats
Share of departures80.1%86.0%
Load
- WN
125 departures · 21,761 seats
Share of departures19.7%81.9%
Load
- OO
1 departures · 50 seats
Share of departures0.2%0.0%
Load
What plane flies DEN–IAD?
In May 2026, the Airbus A321neo flew 38% of DEN–IAD departures — more than any other aircraft type.
- Airbus A321neo
239 departures · 84.6% load
37.8% - Boeing 737-900ER
154 departures · 83.8% load
24.3% - Boeing 757-300
91 departures · 91.0% load
14.4% - Boeing 737 MAX 8
88 departures · 81.7% load
13.9% - Boeing 737-800
34 departures · 83.8% load
5.4% - Boeing 737 MAX 9
23 departures · 90.6% load
3.6% - Boeing 737-700
3 departures · 61.6% load
0.5% - Bombardier CRJ-200
1 departures · 0.0% load
0.2%
How has DEN–IAD traffic changed?
Nonstop DEN–IAD departures fell from 644 in June 2025 to 633 in May 2026.
Monthly nonstop DEN–IAD traffic, trailing 12 months through May 2026. Bars scale to the busiest month; months with no filed service show as zero.
June 2025
644 departures · 112,865 passengers
90.1%
Load
July 2025
704 departures · 116,181 passengers
88.1%
Load
August 2025
667 departures · 114,386 passengers
86.8%
Load
September 2025
588 departures · 102,558 passengers
84.7%
Load
October 2025
567 departures · 93,152 passengers
86.8%
Load
November 2025
550 departures · 86,452 passengers
78.5%
Load
December 2025
610 departures · 108,586 passengers
84.9%
Load
January 2026
541 departures · 83,764 passengers
80.3%
Load
February 2026
517 departures · 79,926 passengers
80.8%
Load
March 2026
595 departures · 95,697 passengers
87.3%
Load
April 2026
582 departures · 93,723 passengers
84.6%
Load
May 2026
633 departures · 104,505 passengers
85.3%
Load
By direction
Each direction is filed separately — they rarely match.
DEN → IAD
86.9% full
317 departures · 53,521 passengers
IAD → DEN
83.6% full
316 departures · 50,984 passengers
Nonstop DEN–IAD traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through May 2026; filings from 2025. Public domain (US Government work).
The airports
Frequently asked
How far is Denver (DEN) from Dulles (IAD)?
DEN to IAD is 1,449 miles (2,332 km / 1,259 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from DEN to IAD?
A nonstop covers the 1,449-mile great-circle distance in roughly 3h 42m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies DEN–IAD?
In May 2026, the Airbus A321neo flew the largest share of departures (37.8%), followed by the Boeing 737-900ER (24.3%).
What mileage do I earn flying DEN–IAD?
Distance-based programs credit off the 1,449-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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