The calculated distance (air line) between Premià de Mar and Arenys de Munt is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Arenys de Munt is certainly longer, as only the direct route (as the crow flies) between Premià de Mar and Arenys de Munt has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles