Arrival in Nueva
If you fly to Asturias airport (OVI) there are easy shuttle connection to city centre bus station, then take a bus to Nueva de Llanes (check timetables at www.alsa.es).
If you fly to other airports (Santander-SDR or Bilbao-BIO) you can catch a direct bus to nueva de Llanes from Santander or Bilbao city centre.
It is wise to book your bus tickets and taxi transfer in advance, especially if you're travelling in summer or at weekends. Bus tickets can be purchased in advance on the ALSA website or through your Spanish Bike Tours office.
Departure from Gijón
From Gijón there are easy bus connections to all 3 airports (Asturias-OVD, Santander and Bilbao). Check www.alsa.es. You can also book your bus tickets through Spanish Bike Tours office
If you want to return to the start, in Nueva, you can take a slow train or a faster trip by bus (without bike).
S-Cape Travel can also arrange private transfers to / from the different airports at the beginning or end of the tour.