The calculated distance (air line) between Kantharalak and Sakon Nakhon is approximately 177 miles respectively 285 kilometers.
By car or train, the actual journey to Sakon Nakhon is certainly longer, as only the direct route (as the crow flies) between Kantharalak and Sakon Nakhon has been calculated here.
Air line (approximately)
285 kilometers
154 nautical miles