The calculated distance (air line) between Ibiza and L'Hospitalet de Llobregat is approximately 173 miles respectively 278 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 Ibiza and L'Hospitalet de Llobregat has been calculated here.
Air line (approximately)
278 kilometers
150 nautical miles