There are several ferry services between St. Kitts and Nevis, all with byzantine schedules that are subject to abrupt change. Most companies make two or three daily trips. All the ferries take about 30 to 45 minutes and cost $8. You can get up-to-date information about all the options from the central ferry information number or Web site listed below.
Sea-taxi service between the two islands is operated by Kenneth Samuel of Kenneth's Dive Centre, Nevis Water Sports, Leeward Island Charters, and Austin Macleod of Pro-Divers for $20 one-way in summer, $25 in winter, with a four-person minimum. There's an additional EC$1 tax for port security, paid separately upon departure.
Ferry information (869/466-4636. boatschedule.leytonms.com). Kenneth's Dive Centre (869/465-2670). Leeward Island Charters (869/465-7474). Nevis Water Sports (869/469-9060). Pro-Divers (869/465-3223).