The calculated distance (air line) between Mollet del Vallès and Castellar del Vallès is approximately 9 miles respectively 14 kilometers.
By car or train, the actual journey to Castellar del Vallès is certainly longer, as only the direct route (as the crow flies) between Mollet del Vallès and Castellar del Vallès has been calculated here.
Air line (approximately)
14 kilometers
7 nautical miles