The calculated distance (air line) between Welchman Hall and Sainte-Luce is approximately 126 miles respectively 203 kilometers.
By car or train, the actual journey to Sainte-Luce is certainly longer, as only the direct route (as the crow flies) between Welchman Hall and Sainte-Luce has been calculated here.
Air line (approximately)
203 kilometers
110 nautical miles