The calculated distance (air line) between El Masnou and L'Hospitalet de Llobregat is approximately 14 miles respectively 23 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 El Masnou and L'Hospitalet de Llobregat has been calculated here.
Air line (approximately)
23 kilometers
12 nautical miles