The calculated distance (air line) between Phuntsholing and Lungtenzampa is approximately 45 miles respectively 73 kilometers.
By car or train, the actual journey to Lungtenzampa is certainly longer, as only the direct route (as the crow flies) between Phuntsholing and Lungtenzampa has been calculated here.
Air line (approximately)
73 kilometers
39 nautical miles