The calculated distance (air line) between Saint-Leu-la-Forêt and Reims is approximately 82 miles respectively 132 kilometers.
By car or train, the actual journey to Reims is certainly longer, as only the direct route (as the crow flies) between Saint-Leu-la-Forêt and Reims has been calculated here.
Air line (approximately)
132 kilometers
71 nautical miles