The calculated distance (air line) between Jaffa and Umm el Faḥm is approximately 40 miles respectively 64 kilometers.
By car or train, the actual journey to Umm el Faḥm is certainly longer, as only the direct route (as the crow flies) between Jaffa and Umm el Faḥm has been calculated here.
Air line (approximately)
64 kilometers
35 nautical miles