The calculated distance (air line) between El Prat de Llobregat and Sant Andreu de la Barca is approximately 10 miles respectively 17 kilometers.
By car or train, the actual journey to Sant Andreu de la Barca is certainly longer, as only the direct route (as the crow flies) between El Prat de Llobregat and Sant Andreu de la Barca has been calculated here.
Air line (approximately)
17 kilometers
9 nautical miles