The calculated distance (air line) between Aix-les-Bains and Saint-Étienne is approximately 76 miles respectively 122 kilometers.
By car or train, the actual journey to Saint-Étienne is certainly longer, as only the direct route (as the crow flies) between Aix-les-Bains and Saint-Étienne has been calculated here.
Air line (approximately)
122 kilometers
66 nautical miles