The calculated distance (air line) between Le Puy-en-Velay and Saint-Étienne is approximately 36 miles respectively 59 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 Puy-en-Velay and Saint-Étienne has been calculated here.
Air line (approximately)
59 kilometers
32 nautical miles