Bayern travelled to Barcelona full of hope after last weekend's 1-1 first-leg draw. However, Mahmutovic was beaten early as Salma Paralluelo put the hosts ahead in the 13th minute. The FCB women hit back immediately, and Linda Dallmann equalised in the 17th.
However, Barcelona retook the lead through superstar Alexia Putellas in the 22nd minute, and that slim advantage held until half-time. Ewa Pajor extended the cushion in the 55th minute, and Putellas completed the scoring with Barca's fourth three minutes later.
On 23 May in Oslo, Barcelona will face Olympique Lyon in the Champions League final. Lyon reached the decider after a 3-1 second-leg win over Arsenal on Saturday, a result guided by German international Jule Brand with a goal and an assist.