The calculated distance (air line) between Arenys de Mar and L'Hospitalet de Llobregat is approximately 28 miles respectively 45 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 Arenys de Mar and L'Hospitalet de Llobregat has been calculated here.
Air line (approximately)
45 kilometers
24 nautical miles