Travel between St. Lucia and Martinique is primarily handled by high-speed ferries, and as of 2026, a standard round-trip ticket costs approximately €100 to €130 (roughly $110 to $145 USD). The most frequent service is operated by L'Express des Îles, which runs a 90-minute crossing between the Castries terminal in St. Lucia and Fort-de-France in Martinique. One-way tickets are generally around €70 to €85. If you prefer to fly, regional airlines like Air Caraïbes or Winair offer short 20-minute flights, but these are significantly more expensive, often starting at $250 to $350 for a round-trip when accounting for airport taxes. For ferry travelers, it is important to note that you must arrive at the terminal at least one hour before departure for customs and immigration, as you are moving between a sovereign nation (St. Lucia) and an overseas department of France (Martinique). Booking online in advance is highly recommended, especially during the peak "Sainte-Lucie" festival season or the Christmas holidays when the ferries can reach full capacity.