The calculated distance (air line) between Blois and Saint-Jean-de-la-Ruelle is approximately 33 miles respectively 53 kilometers.
By car or train, the actual journey to Saint-Jean-de-la-Ruelle is certainly longer, as only the direct route (as the crow flies) between Blois and Saint-Jean-de-la-Ruelle has been calculated here.
Air line (approximately)
53 kilometers
29 nautical miles