Bilbao Airport is served by one terminal, which is spacious and very well laid out. The distances are small and you can walk no more than 150 metres from the terminal entrance to the aircraft.
The ground floor is set aside for arrivals, while the first floor houses the check-in desks and the only security checkpoint.
The transit area is shared by all flights. Passport control, beyond which are the departure gates for non-Schengen flights, is located after security near gate B15.
An interactive map of all terminals can be found on the airport's official website: www.aena.es/en