Dulles (IAD) to Sint Maarten (SXM)
Flight time
≈ 4h 10m
Bearing
145° SE
Dulles (IAD) to Sint Maarten (SXM) is 1,682 miles (2,706 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies IAD–SXM
Filed traffic dataIn July 2026, United Airlines was the only carrier flying nonstop IAD–SXM; the Boeing 737 MAX 8 was the most common aircraft at 100% of departures; flights ran 84% full.
Departures
62
July 2026
Seats
10,292
both directions
Passengers
8,610
both directions
Load factor
83.7%
RPM ÷ ASM
Who flies IAD–SXM?
United Airlines was the only carrier to fly nonstop IAD–SXM in July 2026 (62 departures).
- UA
62 departures · 10,292 seats
Share of departures100.0%83.7%
Load
What plane flies IAD–SXM?
In July 2026, the Boeing 737 MAX 8 flew 100% of IAD–SXM departures.
- Boeing 737 MAX 8
62 departures · 83.7% load
100.0%
How has IAD–SXM traffic changed?
Nonstop IAD–SXM departures rose from 18 in August 2025 to 62 in July 2026.
Monthly nonstop IAD–SXM traffic, trailing 12 months through July 2026. Bars scale to the busiest month; months with no filed service show as zero.
August 2025
18 departures · 2,067 passengers
69.2%
Load
September 2025
0 departures · 0 passengers
—
Load
October 2025
0 departures · 0 passengers
—
Load
November 2025
10 departures · 1,258 passengers
75.8%
Load
December 2025
32 departures · 3,776 passengers
71.1%
Load
January 2026
20 departures · 2,432 passengers
73.3%
Load
February 2026
17 departures · 2,246 passengers
79.6%
Load
March 2026
57 departures · 7,132 passengers
76.6%
Load
April 2026
25 departures · 3,051 passengers
76.3%
Load
May 2026
28 departures · 3,609 passengers
77.6%
Load
June 2026
60 departures · 7,963 passengers
80.0%
Load
July 2026
62 departures · 8,610 passengers
83.7%
Load
By direction
Each direction is filed separately — they rarely match.
IAD → SXM
84.1% full
31 departures · 4,329 passengers
SXM → IAD
83.2% full
31 departures · 4,281 passengers
Nonstop IAD–SXM 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
Sint Maarten
SX
Princess Juliana International Airport
Coordinates
18.04°N, 63.11°W
Hemisphere
N · W
Frequently asked
How far is Dulles (IAD) from Sint Maarten (SXM)?
IAD to SXM is 1,682 miles (2,706 km / 1,461 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from IAD to SXM?
A nonstop covers the 1,682-mile great-circle distance in roughly 4h 10m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies IAD–SXM?
In July 2026, the Boeing 737 MAX 8 flew the largest share of departures (100.0%).
What mileage do I earn flying IAD–SXM?
Distance-based programs credit off the 1,682-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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