The calculated distance (air line) between East Jerusalem and Ḩalḩūl is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Ḩalḩūl is certainly longer, as only the direct route (as the crow flies) between East Jerusalem and Ḩalḩūl has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles