By road
Via Bermeo: BI631 Bilbao-Mungia-Bermeo / BI2101 Bakio-Bermeo
Via Guernica: BI-635 Amorebieta-Guernica (motorway as far as Amorebieta)
Via Mungia: BI 2121Mungia-Guernica
Via Lekeitio: BI-3238 Lekeitio-Guernica
You can get a Barik card and use it to pay for the train and the bus. The system is convenient and cheaper.ómodo y más barato.