The calculated distance (air line) between Salzwedel and Königslutter am Elm is approximately 44 miles respectively 71 kilometers.
By car or train, the actual journey to Königslutter am Elm is certainly longer, as only the direct route (as the crow flies) between Salzwedel and Königslutter am Elm has been calculated here.
Air line (approximately)
71 kilometers
38 nautical miles