The calculated distance (air line) between Pozuelo de Alarcón and Arroyomolinos is approximately 13 miles respectively 20 kilometers.
By car or train, the actual journey to Arroyomolinos is certainly longer, as only the direct route (as the crow flies) between Pozuelo de Alarcón and Arroyomolinos has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles