The calculated distance (air line) between Khlong Luang and Nong Khae is approximately 24 miles respectively 39 kilometers.
By car or train, the actual journey to Nong Khae is certainly longer, as only the direct route (as the crow flies) between Khlong Luang and Nong Khae has been calculated here.
Air line (approximately)
39 kilometers
21 nautical miles