The calculated distance (air line) between Pran Buri and Krathum Baen is approximately 91 miles respectively 146 kilometers.
By car or train, the actual journey to Krathum Baen is certainly longer, as only the direct route (as the crow flies) between Pran Buri and Krathum Baen has been calculated here.
Air line (approximately)
146 kilometers
79 nautical miles