The calculated distance (air line) between Salfīt and Ma‘ale Adummim is approximately 22 miles respectively 36 kilometers.
By car or train, the actual journey to Ma‘ale Adummim is certainly longer, as only the direct route (as the crow flies) between Salfīt and Ma‘ale Adummim has been calculated here.
Air line (approximately)
36 kilometers
19 nautical miles