The calculated distance (air line) between Valencia and Sant Boi de Llobregat is approximately 181 miles respectively 292 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 Valencia and Sant Boi de Llobregat has been calculated here.
Air line (approximately)
292 kilometers
157 nautical miles