The calculated distance (air line) between Corbera de Llobregat and Gràcia is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Gràcia is certainly longer, as only the direct route (as the crow flies) between Corbera de Llobregat and Gràcia has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles