The calculated distance (air line) between Ubon Ratchathani and Si Sa Ket is approximately 36 miles respectively 57 kilometers.
By car or train, the actual journey to Si Sa Ket is certainly longer, as only the direct route (as the crow flies) between Ubon Ratchathani and Si Sa Ket has been calculated here.
Air line (approximately)
57 kilometers
31 nautical miles