The calculated distance (air line) between L'Hospitalet de Llobregat and Gavà is approximately 6 miles respectively 10 kilometers.
By car or train, the actual journey to Gavà is certainly longer, as only the direct route (as the crow flies) between L'Hospitalet de Llobregat and Gavà has been calculated here.
Air line (approximately)
10 kilometers
6 nautical miles