Santander's airport (tlf: (+34) 942 251004), at five kilometers from the center of the city, has connections with Brussels, Dublin, Dusseldorf, Frankfurt, Milan, London, and Rome. From within Spain, flight time to Santander airport is approximately one hour duration. Visit Iberia (www.iberia.com), Iberia Air nostrum (www.airnostrum.com), and Ryanair (www.ryanair.com) for more information.
There is a bus service from the airport to the center of the city each 30 minutes, and the duration of the travel is 15'. You can consult it here.
Bilbao's airport in the city limits of Loiu, has connections with Brussels, Dublin, Dusseldorf, Frankfurt, Lisbon, London, Marrakesh, Munich and Paris, apart from inner-country connections; and it is at about 100kms far from Santander, but this distance can be easily covered trough highway in about one hour. Bus company ALSA covers this route (www.alsa.es phone: (+34) 902 42 22 42).
Several taxis go from the airport to ALSA station in Bilbao (Plaza Amezola). As an option, a taxi can be taken directly from Bilbao to Santander.