The calculated distance (air line) between Phan Rang-Tháp Chàm and Củ Chi is approximately 174 miles respectively 280 kilometers.
By car or train, the actual journey to Củ Chi is certainly longer, as only the direct route (as the crow flies) between Phan Rang-Tháp Chàm and Củ Chi has been calculated here.
Air line (approximately)
280 kilometers
151 nautical miles