The calculated distance (air line) between Dĩ An and Phan Thiết is approximately 90 miles respectively 146 kilometers.
By car or train, the actual journey to Phan Thiết is certainly longer, as only the direct route (as the crow flies) between Dĩ An and Phan Thiết has been calculated here.
Air line (approximately)
146 kilometers
79 nautical miles