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