The calculated distance (air line) between L'Hospitalet de Llobregat and Sant Boi de Llobregat is approximately 3 miles respectively 6 kilometers.
By car or train, the actual journey to Sant Boi de Llobregat is certainly longer, as only the direct route (as the crow flies) between L'Hospitalet de Llobregat and Sant Boi de Llobregat has been calculated here.
Air line (approximately)
6 kilometers
3 nautical miles