The calculated distance (air line) between Rebecq-Rognon and Seraing is approximately 61 miles respectively 99 kilometers.
By car or train, the actual journey to Seraing is certainly longer, as only the direct route (as the crow flies) between Rebecq-Rognon and Seraing has been calculated here.
Air line (approximately)
99 kilometers
53 nautical miles