The calculated distance (air line) between Saint-Germain-lès-Corbeil and Reims is approximately 83 miles respectively 133 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-lès-Corbeil and Reims has been calculated here.
Air line (approximately)
133 kilometers
72 nautical miles