The calculated distance (air line) between Phasi Charoen and Suphan Buri is approximately 57 miles respectively 91 kilometers.
By car or train, the actual journey to Suphan Buri is certainly longer, as only the direct route (as the crow flies) between Phasi Charoen and Suphan Buri has been calculated here.
Air line (approximately)
91 kilometers
49 nautical miles