The calculated distance (air line) between San Vicente de Tagua Tagua and Chillán is approximately 161 miles respectively 258 kilometers.
By car or train, the actual journey to Chillán is certainly longer, as only the direct route (as the crow flies) between San Vicente de Tagua Tagua and Chillán has been calculated here.
Air line (approximately)
258 kilometers
139 nautical miles