The calculated distance (air line) between Tirunelveli and Thiruvananthapuram is approximately 53 miles respectively 85 kilometers.
By car or train, the actual journey to Thiruvananthapuram is certainly longer, as only the direct route (as the crow flies) between Tirunelveli and Thiruvananthapuram has been calculated here.
Air line (approximately)
85 kilometers
46 nautical miles