The calculated distance (air line) between Korsun-Shevchenkivskyy and Zhytomyr is approximately 129 miles respectively 207 kilometers.
By car or train, the actual journey to Zhytomyr is certainly longer, as only the direct route (as the crow flies) between Korsun-Shevchenkivskyy and Zhytomyr has been calculated here.
Air line (approximately)
207 kilometers
112 nautical miles