The calculated distance (air line) between Terrassa and Montornès del Vallès is approximately 13 miles respectively 21 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 Terrassa and Montornès del Vallès has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles