The calculated distance (air line) between Samdrup Jongkhar and Lhuentse is approximately 63 miles respectively 102 kilometers.
By car or train, the actual journey to Lhuentse is certainly longer, as only the direct route (as the crow flies) between Samdrup Jongkhar and Lhuentse has been calculated here.
Air line (approximately)
102 kilometers
55 nautical miles