The calculated distance (air line) between Kamalasai and Ubon Ratchathani is approximately 114 miles respectively 183 kilometers.
By car or train, the actual journey to Ubon Ratchathani is certainly longer, as only the direct route (as the crow flies) between Kamalasai and Ubon Ratchathani has been calculated here.
Air line (approximately)
183 kilometers
99 nautical miles