Unfortunately Castro Urdiales does not have an airport. Nevertheless it is easy to reach by bus from Santander or Bilbao, which both have an airport. The Castro Urdiales City Council web page provides timetables here.
They provide an interactive map of the city as well.
At the airport, you can take a taxi to get Castro-Urdiales, this is the easiest way. The taxi costs approximately 45 euros and the trip takes around 25 minutes.
However, the cheapest option is to go to bus station of Bilbao by bus from the airport (see this timetable) and then to take a bus to Castro Urdiales (there are many buses connecting Castro Urdiales and Bilbao), that is:
Bilbao airport → bus station of Bilbao → Castro Urdiales
TIME TABLE FOR BUSES FROM BILBAO BUS STATION TO CASTRO URDIALES
August 31, 2006
BILBAO BUS STATION...................... CASTRO URDIALES
Departure Arrival
7:30 ................................................................8:00
10:15 .............................................................10:45
12:00 ..............................................................12:30
13:30 ..............................................................14:10
15:30 ..............................................................16:00
16:15 ..............................................................16:45
17:30 ..............................................................18:00
19:30 ..............................................................20:15
20:30 ..............................................................21:00
21:15 ..............................................................21:45
Check the webpage www.alsa.es to obtain more information about buses for Castro Urdiales- Bilbao.
At the airport, you can take a taxi to get Castro-Urdiales, this is the easiest way too. It costs approximately 60 euros and takes around 50 minutes.
However, the cheapest option is to go to bus station of Santander by taxi from the airport and then to take a bus to Castro Urdiales (there are many buses connecting Santander - Castro Urdiales), that is:
Santander airport → bus station of Santander → Castro Urdiales
TIME TABLE FOR BUSES FROM SANTANDER BUS STATION TO CASTRO URDIALES
August 31, 2006
SANTANDER BUS STATION................CASTRO URDIALES
Departure Arrival
9:30 ................................................................10:30
11:00 .............................................................12:00
12:30 ..............................................................13:30
13:00 ..............................................................14:00
14:00 ..............................................................15:00
15:00 ..............................................................16:00
15:30 ..............................................................16:00
18:00 ..............................................................19:00
18:30 ..............................................................19:30
19:00 ..............................................................20:00
20:00 ..............................................................21:00
20:30 ..............................................................21:30
Check the webpage www.alsa.es to obtain more information about buses for Castro Urdiales-Santander