Despite beginning their season in Matchday 2 after their scheduled opener was postponed, Hansi Flick's side looked anything but rusty, producing a ruthless attacking display that overwhelmed Elche from start to finish.
Barcelona's captain, Raphinha, was the standout performer of the evening. The Brazilian opened the scoring from the penalty spot before adding a second later in the game, while also providing an assist in a commanding individual display.
The second half belonged to Fermín López, who struck twice as Barcelona's substitutes injected even more intensity into an already dominant performance. Fellow newcomer Anthony Gordon also made an instant impact, registering assists shortly after coming off the bench.
Barcelona dictated possession throughout the contest, suffocating Elche with relentless pressing and quick transitions. The hosts rarely threatened goalkeeper Joan García, as Flick's men controlled proceedings at both ends of the pitch.
The only concern for the Catalans came when midfielder Gavi was forced off with a lower-leg injury, slightly dampening an otherwise perfect evening.
With a five-star performance away from home, Barcelona have sent an early warning to the rest of La Liga. Flick's revamped squad blended experienced stars with exciting new arrivals, suggesting the defending champions remain the team to beat as they chase a third consecutive league crown.