The calculated distance (air line) between Khon Kaen and Sakon Nakhon is approximately 100 miles respectively 161 kilometers.
By car or train, the actual journey to Sakon Nakhon is certainly longer, as only the direct route (as the crow flies) between Khon Kaen and Sakon Nakhon has been calculated here.
Air line (approximately)
161 kilometers
87 nautical miles