The calculated distance (air line) between Pak Chong and Krathum Baen is approximately 106 miles respectively 171 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Pak Chong and Krathum Baen has been calculated here.
Air line (approximately)
171 kilometers
92 nautical miles