The calculated distance (air line) between Kleinwallstadt and Alzenau in Unterfranken is approximately 16 miles respectively 25 kilometers.
By car or train, the actual journey to Alzenau in Unterfranken is certainly longer, as only the direct route (as the crow flies) between Kleinwallstadt and Alzenau in Unterfranken has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles