The calculated distance (air line) between Chon Daen and Krathum Baen is approximately 180 miles respectively 289 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Chon Daen and Krathum Baen has been calculated here.
Air line (approximately)
289 kilometers
156 nautical miles