The calculated distance (air line) between Higashi-ōsaka and Amagasaki is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Amagasaki is certainly longer, as only the direct route (as the crow flies) between Higashi-ōsaka and Amagasaki has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles