Ferry from Dominica to Saint Lucia There is currently just the 1 ferry route running between Dominica and Saint Lucia operated by 1 ferry company – L'Express Des Iles. The Roseau to Castries ferry crossing operates Weekly with a scheduled sailing duration from about 4 hours 15 minutes.

Traveling from Dominica to St Lucia by sea typically takes approximately 4 hours and 30 minutes. In 2026, the primary service for this route is the high-speed ferry operated by L'Express des Îles. This ferry departs from the capital of Dominica, Roseau, and arrives at the ferry terminal in Castries, St Lucia. The journey usually includes a short stopover at Fort-de-France in Martinique, which is factored into the total travel time. Travelers should be aware that the Caribbean Sea can be quite choppy between these islands, so motion sickness precautions are often recommended. Additionally, because both Dominica and St Lucia are independent nations, you must arrive at the terminal at least 60 to 90 minutes early to clear customs and immigration, making the total transit experience closer to a 6-hour commitment.