The calculated distance (air line) between Cardedeu and L'Hospitalet de Llobregat is approximately 23 miles respectively 38 kilometers.
By car or train, the actual journey to L'Hospitalet de Llobregat is certainly longer, as only the direct route (as the crow flies) between Cardedeu and L'Hospitalet de Llobregat has been calculated here.
Air line (approximately)
38 kilometers
20 nautical miles