The calculated distance (air line) between Nong Kung Si and Kosum Phisai is approximately 32 miles respectively 51 kilometers.
By car or train, the actual journey to Kosum Phisai is certainly longer, as only the direct route (as the crow flies) between Nong Kung Si and Kosum Phisai has been calculated here.
Air line (approximately)
51 kilometers
28 nautical miles