The calculated distance (air line) between Gūduvāncheri and Kallakurichi is approximately 107 miles respectively 172 kilometers.
By car or train, the actual journey to Kallakurichi is certainly longer, as only the direct route (as the crow flies) between Gūduvāncheri and Kallakurichi has been calculated here.
Air line (approximately)
172 kilometers
93 nautical miles