The calculated distance (air line) between Saint-Florent-sur-Cher and Reims is approximately 177 miles respectively 285 kilometers.
By car or train, the actual journey to Reims is certainly longer, as only the direct route (as the crow flies) between Saint-Florent-sur-Cher and Reims has been calculated here.
Air line (approximately)
285 kilometers
154 nautical miles