Gorka Guruzeta scored two goals, with Alvaro Djalo also finding the back of the net for Athletic, while Iago Aspas scored a penalty for Celta to briefly level the score.
Athletic Bilbao coach Ernersto Valverde was delighted with their 3-1 win against Celta Vigo.AdvertisementAdvertisement"I can't remember a week like this, where you have three LaLiga games and you win all three. It was a crucial week," Valverde said post-match.
"We went to Las Palmas a bit tight on points, we needed to win and we've picked up nine points that will help us start the Europa League in a good frame of mind.
"The distance between defeat and victory is not that big in a league as tight as this one. We work hard so that the small details fall on our side and it's working for us."
He added: "It's always good for the strikers to score because it gives them confidence - although we don't really mind who scores. Goals and points in the first division are worth a lot."