The calculated distance (air line) between Wangdue Phodrang and Tsimasham is approximately 35 miles respectively 56 kilometers.
By car or train, the actual journey to Tsimasham is certainly longer, as only the direct route (as the crow flies) between Wangdue Phodrang and Tsimasham has been calculated here.
Air line (approximately)
56 kilometers
30 nautical miles