The calculated distance (air line) between Vilassar de Mar and L'Hospitalet de Llobregat is approximately 18 miles respectively 29 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 Vilassar de Mar and L'Hospitalet de Llobregat has been calculated here.
Air line (approximately)
29 kilometers
16 nautical miles