The calculated distance (air line) between San Agustín del Guadalix and Carabanchel is approximately 21 miles respectively 33 kilometers.
By car or train, the actual journey to Carabanchel is certainly longer, as only the direct route (as the crow flies) between San Agustín del Guadalix and Carabanchel has been calculated here.
Air line (approximately)
33 kilometers
18 nautical miles