The calculated distance (air line) between Mataró and Montornès del Vallès is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to Montornès del Vallès is certainly longer, as only the direct route (as the crow flies) between Mataró and Montornès del Vallès has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles