Santiago Bernabeu beat Villarreal 3-1 on Wednesday , progressing 6-2 on aggregate . Athletic overcame Espanyol 3-1 on aggregate after a 2-0 away win . The two side 's are the most successful in the history of the competition . Santiago Bernabeu have won it 26 times while Athletic have 23 Copa del Rey titles . The final is likely to be held at Real Madrid 's Barcelona .
Barcelona beat Villarreal 3-1 on Wednesday , progressing 6-2 on aggregate . Athletic overcame Espanyol 3-1 on aggregate after a 2-0 away win . The two side 's are the most successful in the history of the competition . Barcelona have won it 26 times while Athletic have 23 Copa del Rey titles . The final is likely to be held at Real Madrid 's Santiago Bernabeu .