The calculated distance (air line) between Kuchinarai and Sakon Nakhon is approximately 43 miles respectively 70 kilometers.
By car or train, the actual journey to Sakon Nakhon is certainly longer, as only the direct route (as the crow flies) between Kuchinarai and Sakon Nakhon has been calculated here.
Air line (approximately)
70 kilometers
38 nautical miles