The calculated distance (air line) between Trashigang and Wangdue Phodrang is approximately 102 miles respectively 164 kilometers.
By car or train, the actual journey to Wangdue Phodrang is certainly longer, as only the direct route (as the crow flies) between Trashigang and Wangdue Phodrang has been calculated here.
Air line (approximately)
164 kilometers
89 nautical miles