The calculated distance (air line) between Amiens and Champigny-sur-Marne is approximately 75 miles respectively 121 kilometers.
By car or train, the actual journey to Champigny-sur-Marne is certainly longer, as only the direct route (as the crow flies) between Amiens and Champigny-sur-Marne has been calculated here.
Air line (approximately)
121 kilometers
65 nautical miles