The calculated distance (air line) between Bua Yai and Sakon Nakhon is approximately 158 miles respectively 254 kilometers.
By car or train, the actual journey to Sakon Nakhon is certainly longer, as only the direct route (as the crow flies) between Bua Yai and Sakon Nakhon has been calculated here.
Air line (approximately)
254 kilometers
137 nautical miles