The calculated distance (air line) between Ban Selaphum and Sakon Nakhon is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Sakon Nakhon is certainly longer, as only the direct route (as the crow flies) between Ban Selaphum and Sakon Nakhon has been calculated here.
Air line (approximately)
129 kilometers
70 nautical miles