The calculated distance (air line) between Chai Badan and Krathum Baen is approximately 122 miles respectively 196 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Chai Badan and Krathum Baen has been calculated here.
Air line (approximately)
196 kilometers
106 nautical miles