The calculated distance (air line) between Gongdanglegi Kulon and Surabaya is approximately 64 miles respectively 104 kilometers.
By car or train, the actual journey to Surabaya is certainly longer, as only the direct route (as the crow flies) between Gongdanglegi Kulon and Surabaya has been calculated here.
Air line (approximately)
104 kilometers
56 nautical miles