Already trailing 4-1 from the first leg in Catalonia, the Women's Super League leaders faced a daunting task. Their hopes quickly faded as Barcelona scored three times in a dominant first half in front of 26,702 fans.
Aitana Bonmati fired the visitors ahead with a powerful finish into the roof of the net, before quick goals from Ewa Pajor and Claudia Pina, whose long-range strike went in off the woodwork, further deepened Chelsea's misery.
Salma Paralluelo added a fourth late on before Wieke Kaptein salvaged a consolation for the hosts. Chelsea were fortunate not to suffer a heavier defeat, with Fridolina Rolfo missing a close-range chance and Hannah Hampton producing key saves.
Barcelona controlled the game with ease, while Chelsea struggled to seriously trouble goalkeeper Cata Coll.
The manner of the defeat will raise questions at Chelsea, particularly as the Champions League remains the one major trophy missing from their collection. Manager Sonia Bompastor, appointed last May to deliver European glory, watched her side completely outclassed over two legs.
Despite their domestic success this season — lifting the Women's League Cup and closing in on another WSL title — Chelsea were second best throughout. Barca's quality, composure, and ruthlessness exposed the gulf between the two sides.
This marks the third consecutive season Chelsea have been knocked out by Barcelona at the semi-final stage, but this year's heavy defeat across 180 minutes feels particularly stark.
Meanwhile, Barcelona continue their quest for a fourth Champions League title in five seasons. Intelligent, clinical, and packed with world-class talent, they look unstoppable — having scored three or more goals in nine of their 10 European games this campaign.
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