The calculated distance (air line) between Essen and Mons-en-Barœul is approximately 179 miles respectively 287 kilometers.
By car or train, the actual journey to Mons-en-Barœul is certainly longer, as only the direct route (as the crow flies) between Essen and Mons-en-Barœul has been calculated here.
Air line (approximately)
287 kilometers
155 nautical miles