The calculated distance (air line) between Kaeng Khro and Sakon Nakhon is approximately 145 miles respectively 233 kilometers.
By car or train, the actual journey to Sakon Nakhon is certainly longer, as only the direct route (as the crow flies) between Kaeng Khro and Sakon Nakhon has been calculated here.
Air line (approximately)
233 kilometers
126 nautical miles