Boston (BOS) to Dulles (IAD)
Flight time
≈ 1h 37m
Bearing
237° SW
Boston (BOS) to Dulles (IAD) is 412 miles (663 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies BOS–IAD
Filed traffic dataIn July 2026, United Airlines operated the most departures, one of 6 carriers flying nonstop BOS–IAD; the Boeing 737 MAX 9 was the most common aircraft at 42% of departures; flights ran 88% full.
Departures
333
July 2026
Seats
49,388
both directions
Passengers
43,480
both directions
Load factor
88.0%
RPM ÷ ASM
Who flies BOS–IAD?
United Airlines operated the most nonstop BOS–IAD departures in July 2026 (235), one of 6 carriers on the route.
- UA
235 departures · 41,662 seats
Share of departures70.6%88.4%
Load
- YX
93 departures · 7,068 seats
Share of departures27.9%86.7%
Load
- DL
2 departures · 144 seats
Share of departures0.6%48.6%
Load
- AA
1 departures · 190 seats
Share of departures0.3%94.2%
Load
- AS
1 departures · 161 seats
Share of departures0.3%72.0%
Load
- TP
TAP-TAP Air Portugal
1 departures · 163 seats
Share of departures0.3%85.9%
Load
What plane flies BOS–IAD?
In July 2026, the Boeing 737 MAX 9 flew 42% of BOS–IAD departures — more than any other aircraft type.
- Boeing 737 MAX 9
139 departures · 89.2% load
41.7% - Embraer E175
93 departures · 86.7% load
27.9% - Boeing 737-900ER
65 departures · 84.6% load
19.5% - Boeing 737-800
32 departures · 92.6% load
9.6% - Boeing 757-200
2 departures · 48.6% load
0.6% - Airbus A321
1 departures · 94.2% load
0.3% - Airbus A330-900
1 departures · 85.9% load
0.3%
How has BOS–IAD traffic changed?
Nonstop BOS–IAD departures rose from 267 in August 2025 to 333 in July 2026.
Monthly nonstop BOS–IAD traffic, trailing 12 months through July 2026. Bars scale to the busiest month; months with no filed service show as zero.
August 2025
267 departures · 42,025 passengers
90.0%
Load
September 2025
283 departures · 40,503 passengers
82.6%
Load
October 2025
251 departures · 38,811 passengers
90.2%
Load
November 2025
239 departures · 35,521 passengers
85.9%
Load
December 2025
246 departures · 36,254 passengers
87.0%
Load
January 2026
210 departures · 28,778 passengers
79.6%
Load
February 2026
199 departures · 26,951 passengers
78.8%
Load
March 2026
241 departures · 35,794 passengers
85.6%
Load
April 2026
240 departures · 36,075 passengers
85.3%
Load
May 2026
250 departures · 38,021 passengers
86.6%
Load
June 2026
240 departures · 37,214 passengers
87.4%
Load
July 2026
333 departures · 43,480 passengers
88.0%
Load
By direction
Each direction is filed separately — they rarely match.
IAD → BOS
88.4% full
167 departures · 22,138 passengers
BOS → IAD
87.7% full
166 departures · 21,342 passengers
Nonstop BOS–IAD traffic has been filed since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through July 2026; filings from 2025. Public domain (US Government work).
The airports
Frequently asked
How far is Boston (BOS) from Dulles (IAD)?
BOS to IAD is 412 miles (663 km / 358 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from BOS to IAD?
A nonstop covers the 412-mile great-circle distance in roughly 1h 37m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies BOS–IAD?
In July 2026, the Boeing 737 MAX 9 flew the largest share of departures (41.7%), followed by the Embraer E175 (27.9%).
What mileage do I earn flying BOS–IAD?
Distance-based programs credit off the 412-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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