The calculated distance (air line) between Chateaubelair and Sainte-Luce is approximately 84 miles respectively 135 kilometers.
By car or train, the actual journey to Sainte-Luce is certainly longer, as only the direct route (as the crow flies) between Chateaubelair and Sainte-Luce has been calculated here.
Air line (approximately)
135 kilometers
73 nautical miles