The calculated distance (air line) between Hà Tĩnh and Savannakhet is approximately 144 miles respectively 231 kilometers.
By car or train, the actual journey to Savannakhet is certainly longer, as only the direct route (as the crow flies) between Hà Tĩnh and Savannakhet has been calculated here.
Air line (approximately)
231 kilometers
125 nautical miles