There are 2 ferry routes operating between St Martin and St Barts offering you combined total of 42 sailings per week. Great Bay Express operates 1 route, Philipsburg to Gustavia which runs 3 times daily. Voyager operates 1 route, Marigot to Saint Barthelemy which runs 3 times daily.
As the frequency and duration of crossings on some routes varies we would advise that you do a live search for crossings from St Martin to St Barts to get the most up to date information.