The calculated distance (air line) between Gros Islet and Les Trois-Îlets is approximately 33 miles respectively 53 kilometers.
By car or train, the actual journey to Les Trois-Îlets is certainly longer, as only the direct route (as the crow flies) between Gros Islet and Les Trois-Îlets has been calculated here.
Air line (approximately)
53 kilometers
29 nautical miles