The calculated distance (air line) between Le Morne-Rouge and Sainte-Luce is approximately 26 miles respectively 41 kilometers.
By car or train, the actual journey to Sainte-Luce is certainly longer, as only the direct route (as the crow flies) between Le Morne-Rouge and Sainte-Luce has been calculated here.
Air line (approximately)
41 kilometers
22 nautical miles