The calculated distance (air line) between Pathum Thani and Chon Buri is approximately 54 miles respectively 87 kilometers.
By car or train, the actual journey to Chon Buri is certainly longer, as only the direct route (as the crow flies) between Pathum Thani and Chon Buri has been calculated here.
Air line (approximately)
87 kilometers
47 nautical miles