The calculated distance (air line) between Saint-Germain-du-Puy and Reims is approximately 166 miles respectively 267 kilometers.
By car or train, the actual journey to Reims is certainly longer, as only the direct route (as the crow flies) between Saint-Germain-du-Puy and Reims has been calculated here.
Air line (approximately)
267 kilometers
144 nautical miles