The calculated distance (air line) between Esplugues de Llobregat and Sant Martí is approximately 6 miles respectively 10 kilometers.
By car or train, the actual journey to Sant Martí is certainly longer, as only the direct route (as the crow flies) between Esplugues de Llobregat and Sant Martí has been calculated here.
Air line (approximately)
10 kilometers
6 nautical miles