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