The calculated distance (air line) between Nakhon Phanom and Thakhèk is approximately 3 miles respectively 6 kilometers.
By car or train, the actual journey to Thakhèk is certainly longer, as only the direct route (as the crow flies) between Nakhon Phanom and Thakhèk has been calculated here.
Air line (approximately)
6 kilometers
3 nautical miles