The calculated distance (air line) between Mönchengladbach and Rommerskirchen is approximately 15 miles respectively 24 kilometers.
By car or train, the actual journey to Rommerskirchen is certainly longer, as only the direct route (as the crow flies) between Mönchengladbach and Rommerskirchen has been calculated here.
Air line (approximately)
24 kilometers
13 nautical miles