The calculated distance (air line) between Salzwedel and Neustadt-Glewe is approximately 41 miles respectively 65 kilometers.
By car or train, the actual journey to Neustadt-Glewe is certainly longer, as only the direct route (as the crow flies) between Salzwedel and Neustadt-Glewe has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles