The calculated distance (air line) between L'Hospitalet de Llobregat and Sagunto is approximately 170 miles respectively 273 kilometers.
By car or train, the actual journey to Sagunto is certainly longer, as only the direct route (as the crow flies) between L'Hospitalet de Llobregat and Sagunto has been calculated here.
Air line (approximately)
273 kilometers
148 nautical miles