The calculated distance (air line) between Punākha and Samdrup Jongkhar is approximately 114 miles respectively 183 kilometers.
By car or train, the actual journey to Samdrup Jongkhar is certainly longer, as only the direct route (as the crow flies) between Punākha and Samdrup Jongkhar has been calculated here.
Air line (approximately)
183 kilometers
99 nautical miles