The calculated distance (air line) between Alcalá de Henares and Fuente el Saz is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Fuente el Saz is certainly longer, as only the direct route (as the crow flies) between Alcalá de Henares and Fuente el Saz has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles