The calculated distance (air line) between Essen and Oud-Turnhout is approximately 88 miles respectively 142 kilometers.
By car or train, the actual journey to Oud-Turnhout is certainly longer, as only the direct route (as the crow flies) between Essen and Oud-Turnhout has been calculated here.
Air line (approximately)
142 kilometers
76 nautical miles