The calculated distance (air line) between Ipswich and Walton-on-the-Naze is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Walton-on-the-Naze is certainly longer, as only the direct route (as the crow flies) between Ipswich and Walton-on-the-Naze has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles