The calculated distance (air line) between Chok Chai and Krathum Baen is approximately 148 miles respectively 238 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Chok Chai and Krathum Baen has been calculated here.
Air line (approximately)
238 kilometers
128 nautical miles