The calculated distance (air line) between Ubon Ratchathani and Sakon Nakhon is approximately 141 miles respectively 227 kilometers.
By car or train, the actual journey to Sakon Nakhon is certainly longer, as only the direct route (as the crow flies) between Ubon Ratchathani and Sakon Nakhon has been calculated here.
Air line (approximately)
227 kilometers
122 nautical miles