The calculated distance (air line) between Banlung and Ubon Ratchathani is approximately 177 miles respectively 284 kilometers.
By car or train, the actual journey to Ubon Ratchathani is certainly longer, as only the direct route (as the crow flies) between Banlung and Ubon Ratchathani has been calculated here.
Air line (approximately)
284 kilometers
153 nautical miles