The calculated distance (air line) between L'Hospitalet de Llobregat and Gràcia is approximately 4 miles respectively 7 kilometers.
By car or train, the actual journey to Gràcia is certainly longer, as only the direct route (as the crow flies) between L'Hospitalet de Llobregat and Gràcia has been calculated here.
Air line (approximately)
7 kilometers
4 nautical miles