The calculated distance (air line) between Phan Thiết and Svay Rieng is approximately 157 miles respectively 252 kilometers.
By car or train, the actual journey to Svay Rieng is certainly longer, as only the direct route (as the crow flies) between Phan Thiết and Svay Rieng has been calculated here.
Air line (approximately)
252 kilometers
136 nautical miles