The calculated distance (air line) between Chok Chai and Ubon Ratchathani is approximately 183 miles respectively 294 kilometers.
By car or train, the actual journey to Ubon Ratchathani is certainly longer, as only the direct route (as the crow flies) between Chok Chai and Ubon Ratchathani has been calculated here.
Air line (approximately)
294 kilometers
159 nautical miles