My daughter and I need to take a bus from Muxia to Santiago early in the morning on May 20 in order to catch our plane to Madrid. I seem to recall one leaving at about 6:30. I now cannot find a bus schedule. The Groupo Ferrin website does not seem to have a schedule. I think there may be another bus line. Questions: can tickets be booked in advance and, is so, with which bus line and how far in advance. Or, do we buy them the day of or maybe the day before? Again, which bus line?