The calculated distance (air line) between Bellegarde-sur-Valserine and Saint-Étienne is approximately 83 miles respectively 134 kilometers.
By car or train, the actual journey to Saint-Étienne is certainly longer, as only the direct route (as the crow flies) between Bellegarde-sur-Valserine and Saint-Étienne has been calculated here.
Air line (approximately)
134 kilometers
72 nautical miles