The calculated distance (air line) between Ubon Ratchathani and Kantharalak is approximately 43 miles respectively 70 kilometers.
By car or train, the actual journey to Kantharalak is certainly longer, as only the direct route (as the crow flies) between Ubon Ratchathani and Kantharalak has been calculated here.
Air line (approximately)
70 kilometers
38 nautical miles