The calculated distance (air line) between Calella and Montornès del Vallès is approximately 21 miles respectively 33 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 Calella and Montornès del Vallès has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles