The calculated distance (air line) between Le Palais-sur-Vienne and Saint-Étienne is approximately 151 miles respectively 243 kilometers.
By car or train, the actual journey to Saint-Étienne is certainly longer, as only the direct route (as the crow flies) between Le Palais-sur-Vienne and Saint-Étienne has been calculated here.
Air line (approximately)
243 kilometers
131 nautical miles