The calculated distance (air line) between Qiryat HaYovel and Jaffa is approximately 31 miles respectively 50 kilometers.
By car or train, the actual journey to Jaffa is certainly longer, as only the direct route (as the crow flies) between Qiryat HaYovel and Jaffa has been calculated here.
Air line (approximately)
50 kilometers
27 nautical miles