The calculated distance (air line) between Corbera de Llobregat and Sant Martí is approximately 14 miles respectively 23 kilometers.
By car or train, the actual journey to Sant Martí is certainly longer, as only the direct route (as the crow flies) between Corbera de Llobregat and Sant Martí has been calculated here.
Air line (approximately)
23 kilometers
13 nautical miles