The calculated distance (air line) between Tiruvennanallūr and Kallakurichi is approximately 29 miles respectively 46 kilometers.
By car or train, the actual journey to Kallakurichi is certainly longer, as only the direct route (as the crow flies) between Tiruvennanallūr and Kallakurichi has been calculated here.
Air line (approximately)
46 kilometers
25 nautical miles