The calculated distance (air line) between Si Sa Ket and Sakon Nakhon is approximately 142 miles respectively 228 kilometers.
By car or train, the actual journey to Sakon Nakhon is certainly longer, as only the direct route (as the crow flies) between Si Sa Ket and Sakon Nakhon has been calculated here.
Air line (approximately)
228 kilometers
123 nautical miles