The calculated distance (air line) between Pemagatshel and Samdrup Jongkhar is approximately 18 miles respectively 28 kilometers.
By car or train, the actual journey to Samdrup Jongkhar is certainly longer, as only the direct route (as the crow flies) between Pemagatshel and Samdrup Jongkhar has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles