Athletic Bilbao reached the final of the Copa del Rey as Mirandes could not produce another fairytale in a 6-2 second-leg defeat.

Aurtenetxe: Scored Bilbao's third in a blistering opening 22 minutes

An 8-3 aggregate win for Primera Liga top-four contenders Bilbao over their Segunda Division B - Group 2 opponents sets up a final date with either Barcelona or Valencia, who on Wednesday night meet in their second leg.

Leading 2-1 from the first leg, Bilbao wasted little time in stretching their lead and scored three goals in the opening 22 minutes at San Mames.

First, Iker Munain pounced on Inaki Garmendia's 11th minute mistake to open the scoring and, just three minutes later, Markel Susaeta finished a passing move for the second goal.

Mirandes had memorably eliminated Villarreal, Racing Santander and Espanyol on their way to the semi-finals, but they were being taught a lesson by Bilbao.

And in the 22nd minute, even left-back Jon Aurtenetxe got in on the act as he headed Susaeta's cross past helpless visiting goalkeeper Nauzet Perez.

Mirandes emerged in the second half determined to restore some pride and, 13 minutes after the restart, Aldeano Blanco scored the first goal Bilbao have conceded in this season's Copa del Rey when poking a finish after a scramble at a set-piece.

With sense of inevitably, though, Bilbao goal machine Fernando Llorente was not to remain off the score sheet and the Spain international netted twice in four minutes - the first a brilliant, chipped finish.

Blanco ensured his name will go down in Mirandes' history when adding his second goal of the night in the 86th minute after again taking advantage of some slack defending at a set-piece.

But it was far too late for any remarkable turnaround and Fernandez Cesar Caneda's 88th minute own-goal rubber-stamped Bilbao's place in the final.