The calculated distance (air line) between Sarpang and Wangdue Phodrang is approximately 49 miles respectively 78 kilometers.
By car or train, the actual journey to Wangdue Phodrang is certainly longer, as only the direct route (as the crow flies) between Sarpang and Wangdue Phodrang has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles