IRB Castro links Castro Urdiales with Bilbao and Cruces (Barakaldo). Check schedules on Sarebus; tickets are sold at station counters or on board. More information at bilbao-castro.es.
Frequently asked questions
**Internacional Regular Bus Castro S.L.** runs year-round scheduled coaches between
**Castro Urdiales**, **Bilbao** (Termibus) and **Cruces** (Barakaldo). The direct A-8
service is one of the busiest intercity bus corridors in northern Spain.
IRB **does not offer online or advance ticket booking**. Use Sarebus to compare departures
and buy your ticket **at the station counter** (Termibus, Castro Urdiales or Cruces) or
**on board** on the day of travel.
Official timetables, stops and fares at [bilbao-castro.es](https://www.bilbao-castro.es/)
and [2026 timetables](https://www.bilbao-castro.es/horarios-2026/). During Coso Blanco
festivities see [special timetables](https://www.bilbao-castro.es/horario-fiestas-del-coso-blanco-2026/).
IRB Castro (Internacional Regular Bus Castro S.L.) operates state concession VAC-220 with direct A-8 coaches between Castro Urdiales, Bilbao (Termibus) and Cruces (Hospital de Cruces, Barakaldo).
No. IRB Castro does not sell tickets online or accept advance reservations. Buy at the Termibus, Castro Urdiales or Cruces ticket offices, or on board when seats are available. Timetables, stops and fares at bilbao-castro.es.
At Termibus (Bilbao), Castro Urdiales bus station, Cruces (Hospital) or on board. Sarebus shows up-to-date timetables; more information at bilbao-castro.es.
