The calculated distance (air line) between Semur-en-Auxois and Cergy-Pontoise is approximately 149 miles respectively 240 kilometers.
By car or train, the actual journey to Cergy-Pontoise is certainly longer, as only the direct route (as the crow flies) between Semur-en-Auxois and Cergy-Pontoise has been calculated here.
Air line (approximately)
240 kilometers
130 nautical miles