The calculated distance (air line) between Nong Kung Si and Phu Khiao is approximately 80 miles respectively 129 kilometers.
By car or train, the actual journey to Phu Khiao is certainly longer, as only the direct route (as the crow flies) between Nong Kung Si and Phu Khiao has been calculated here.
Air line (approximately)
129 kilometers
69 nautical miles