The calculated distance (air line) between Saint-Martin-de-Crau and Saint-Étienne is approximately 126 miles respectively 202 kilometers.
By car or train, the actual journey to Saint-Étienne is certainly longer, as only the direct route (as the crow flies) between Saint-Martin-de-Crau and Saint-Étienne has been calculated here.
Air line (approximately)
202 kilometers
109 nautical miles