The calculated distance (air line) between Fuencarral-El Pardo and Alcalá de Henares is approximately 20 miles respectively 31 kilometers.
By car or train, the actual journey to Alcalá de Henares is certainly longer, as only the direct route (as the crow flies) between Fuencarral-El Pardo and Alcalá de Henares has been calculated here.
Air line (approximately)
31 kilometers
17 nautical miles