The calculated distance (air line) between Zhytomyr and Stara Syniava is approximately 66 miles respectively 106 kilometers.
By car or train, the actual journey to Stara Syniava is certainly longer, as only the direct route (as the crow flies) between Zhytomyr and Stara Syniava has been calculated here.
Air line (approximately)
106 kilometers
57 nautical miles