Hi, I live in Galdakao so I can tell you the best way to go from Bilbao to Galdakao.
You must go to Bailen, where all buses (except those ones going to Lemona, Gernika or Amorebieta) stop. There is one bus whose front line says: Bilbao-Begoña-Galdakao, there is another bus whose front line says: Bilbao-Basauri-Galdakao or Bilbao-Galdakao-Larrabetzu, these three buses stop in Galdakao.
You can also go to Hurtado de Amezaga to take other buses going to Galdakao, those ones going to Lemona, Durango or Eibar, stop here and go to Galdakao, but it is easier to take the bus in Bailen, for sure.
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