The calculated distance (air line) between Heist-op-den-Berg and Antwerpen is approximately 17 miles respectively 28 kilometers.
By car or train, the actual journey to Antwerpen is certainly longer, as only the direct route (as the crow flies) between Heist-op-den-Berg and Antwerpen has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles