The calculated distance (air line) between Kut Chap and Udon Thani is approximately 14 miles respectively 23 kilometers.
By car or train, the actual journey to Udon Thani is certainly longer, as only the direct route (as the crow flies) between Kut Chap and Udon Thani has been calculated here.
Air line (approximately)
23 kilometers
13 nautical miles