The calculated distance (air line) between Berchem-Sainte-Agathe and Seraing is approximately 56 miles respectively 90 kilometers.
By car or train, the actual journey to Seraing is certainly longer, as only the direct route (as the crow flies) between Berchem-Sainte-Agathe and Seraing has been calculated here.
Air line (approximately)
90 kilometers
49 nautical miles