The calculated distance (air line) between Sarrià-Sant Gervasi and Viladecans is approximately 9 miles respectively 14 kilometers.
By car or train, the actual journey to Viladecans is certainly longer, as only the direct route (as the crow flies) between Sarrià-Sant Gervasi and Viladecans has been calculated here.
Air line (approximately)
14 kilometers
8 nautical miles