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