The calculated distance (air line) between Manresa and Sant Andreu de la Barca is approximately 21 miles respectively 34 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 Manresa and Sant Andreu de la Barca has been calculated here.
Air line (approximately)
34 kilometers
18 nautical miles