1905
Sarria
Empresa Freire connects Santiago to Lugo. Most but not all buses stop enroute at the Santiago Airport. Monbus connects Lugo to Sarria. The transfer point is the Lugo bus station.
Sometimes it is more time efficient to take Empresa Freire bus from Santiago Labcolla airport to Santiago bus station (every half hour) and catch another bus to Lugo.
Monbus has buses from Santiago bus station to Monforte de Lemos and buses from Monforte de Lemos to Sarria.
Renfe provides service to Sarria on trains running between Monforte de Lemos and Betanzos-Infesta. These trains originate in Madrid, Barcelona, etc and terminate in A Coruña or Ferrol. Trains from Santiago usually require a transfer at A Coruña, Ourense, or Monforte de Lemos. If you plan to get from Santiago to Sarria ... use the bus.
Sarria Consello Transportation Page
http://www.sarria.es/index.php?option=com_content&view=article&id=109&itemid=132&lang=gl
Monbus
http://www.monbus.es/index2.htm
Empresa Freire
http://www.empresafreire.com/html/castelan/seccion0.php
Renfe
http://www.renfe.com/index.html
Estacion de Autobuses Santiago
http://www.tussa.org/web/interior.php?txt=arbore_web5&lg=cas
Santiago Airport (SCQ) Labacolla (with flights to London, Frankfurt, et al)
http://www.aena-aeropuertos.es/csee/Satellite/Aeropuerto-Santiago/en/Santiago.html