The calculated distance (air line) between Molins de Rei and Sant Boi de Llobregat is approximately 5 miles respectively 8 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 Molins de Rei and Sant Boi de Llobregat has been calculated here.
Air line (approximately)
8 kilometers
4 nautical miles