The calculated distance (air line) between Champs-sur-Marne and Le Havre is approximately 121 miles respectively 195 kilometers.
By car or train, the actual journey to Le Havre is certainly longer, as only the direct route (as the crow flies) between Champs-sur-Marne and Le Havre has been calculated here.
Air line (approximately)
195 kilometers
105 nautical miles