The calculated distance (air line) between Phon and Ubon Ratchathani is approximately 155 miles respectively 249 kilometers.
By car or train, the actual journey to Ubon Ratchathani is certainly longer, as only the direct route (as the crow flies) between Phon and Ubon Ratchathani has been calculated here.
Air line (approximately)
249 kilometers
135 nautical miles