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