The calculated distance (air line) between Martorell and Cerdanyola del Vallès is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Cerdanyola del Vallès is certainly longer, as only the direct route (as the crow flies) between Martorell and Cerdanyola del Vallès has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles