The calculated distance (air line) between San Lucas ( Pueblo Nuevo de Colan) and San Martin is approximately 33 miles respectively 53 kilometers.
By car or train, the actual journey to San Martin is certainly longer, as only the direct route (as the crow flies) between San Lucas ( Pueblo Nuevo de Colan) and San Martin has been calculated here.
Air line (approximately)
53 kilometers
29 nautical miles