How Long Is the Boat from St Martin to St Barth?
A private speedboat takes about 40 to 50 minutes from Cole Bay or Simpson Bay to Gustavia. The public ferry takes about 80. The crossing is roughly 14 nautical miles across the Anguilla Channel, the rest of this is what changes that number in either direction.
Crossing time by boat type
| Boat type | Crossing time | Cruising speed |
|---|---|---|
| Cigarette / fast speedboat | 30–35 min | ~28–32 knots |
| VanDutch motor yacht | 35–40 min | ~25–30 knots |
| Concept 44 / open sport | 40–45 min | ~22–26 knots |
| Sailing catamaran (under power) | 2–3 hours | ~7–9 knots |
| Public ferry (Voyager / Great Bay Express) | ~80 min | ~15–18 knots |
Most operators settle around 25 knots, which puts the typical crossing right at 40 to 45 minutes. Faster is possible, a Cigarette 36 can do 28 to 32 knots flat-out, but pushing speeds beyond 25 knots in any chop becomes uncomfortable for the passengers, which usually defeats the point.
What pushes the crossing past 40 minutes
Wind direction
Caribbean trade winds blow east-to-west for most of the year. Going from St Martin to St Barth means heading roughly west-to-east, into the wind. On a 15 to 20 knot trade-wind day, standard from December to April, the boat loses 1 to 3 knots and the crossing adds 5 to 10 minutes. The return leg is downwind and gets that time back.
Atlantic swell
From January through March, storms in the North Atlantic generate long-period swell that reaches the Caribbean. When the wave height hits 6 to 8 feet, the captain slows down to keep the ride comfortable, and a 40-minute crossing becomes 50 to 55. If the swell tops 10 feet, the captain cancels.
Where you pick up
Cole Bay on the Dutch side is the shortest run to St Barth. Marigot on the French north coast adds about 10 minutes because the boat has to round the western tip of St Martin before heading east. Oyster Pond on the east side is actually closer in straight-line distance, but the pass through the reef there is rough enough that it's rarely a sensible pickup.
Time of day
Morning crossings between 6 and 10 AM are usually the calmest and the fastest. The trades build through the morning and peak in the early afternoon. Late-afternoon crossings on windy days can be 5 to 10 minutes longer than the same crossing at 8 AM. Sunset crossings around 5:30 to 7 PM often calm again as the wind drops.
The boat itself
Lighter speedboats cut through chop faster than the heavier motor yachts. The yachts are more comfortable in rough water but cruise a few knots slower. The Concept 44 sits in the middle, fast and stable, the most-used vessel for the route in average conditions.
How long the ferry takes (and why it's slower)
The Voyager and Great Bay Express ferries do the same crossing in about 80 minutes. They cruise at 15 to 18 knots, roughly half the speed of a private speedboat. The slower pace is partly hull design, carrying 100+ passengers needs volume that costs speed, and partly economics. Going 25 knots burns dramatically more fuel than going 15, and public operators optimize for cost-per-passenger rather than time. Loading and unloading 100 people with luggage at a public terminal adds another 15 to 20 minutes at each end on top of the crossing itself.
Distance: how far is St Martin from St Barth, exactly?
The straight-line (great-circle) distance between Gustavia harbor on Saint-Barthélemy and Cole Bay on Sint Maarten is approximately:
- 14 nautical miles (the unit captains use)
- 16 statute miles (the unit Americans are used to)
- 26 kilometers (the unit Europeans are used to)
The crossing route isn't quite straight, boats round the eastern point of St Barth on arrival, and exit Simpson Bay lagoon on departure, so the actual sailed distance is closer to 16–18 nautical miles. The two islands are visible from each other on a clear day, you can see one from the other long before you arrive.
Door-to-door time including ground transport
The 40-minute boat figure is just the on-water portion. Real total time from one island's interior to the other:
- SXM airport to St Barth villa: 75–90 minutes (10 min drive + 5 min boarding + 40 min crossing + 5 min disembark + 15 min drive to villa)
- Sint Maarten hotel to St Barth villa: 60–80 minutes
- Marigot hotel to Gustavia hotel: 70–80 minutes (longer drive to dock + crossing)
- Public ferry (any door-to-door): 3–4 hours including taxis on both ends
Frequently asked questions
How long is the boat from Anguilla to St Barth?
A private boat from Anguilla (Blowing Point) direct to St Barth takes about 65–75 minutes. There's no public ferry on this route, private boat is the only option. See our Anguilla guide.
What's the fastest crossing record?
In genuinely calm conditions, light wind, and on a fast Cigarette-style hull, captains have done it in about 28 minutes. That's the absolute floor. Plan for 40 and anything faster is a bonus.
Does the crossing time change at night?
Same crossing time, but captains usually cruise slightly slower at night for visibility. Most crossings are scheduled for daylight hours when possible.
How long is St Barth to St Martin (the return)?
Same 40 minutes, often a few minutes faster on the way back since you're typically going downwind. See the full guide for both directions.