The calculated distance (air line) between Hà Tĩnh and Phon Charoen is approximately 181 miles respectively 291 kilometers.
By car or train, the actual journey to Phon Charoen is certainly longer, as only the direct route (as the crow flies) between Hà Tĩnh and Phon Charoen has been calculated here.
Air line (approximately)
291 kilometers
157 nautical miles