Lionel Messi finished as LaLiga top scorer, claiming the Pichichi for a record seventh time, as Barcelona finished the season with a 5-0 win at Alaves, while Leganes suffered relegation heartbreak.
It was some form of joy for Messi, who has been a frustrated figure since the restart as Barca allowed Real Madrid to claim the title - and they ended the season with 82 points which represents their lowest tally for 12 years.
The Argentina forward took his tally to 25 with a goal in each half after teenage forward Ansu Fati had opened the scoring in the 24th minute.
Luis Suarez made it 3-0 just before half-time, with defender Nelson Semedo - one of just five substitutes named on the bench - adding a fourth just before the hour and Messi completing a comfortable victory with 15 minutes left.
Barcelona will next be in action when they play Napoli in the second leg of their Champions League last-16 tie on August 8, which is level at 1-1.
LaLiga champions Real Madrid signed off with a 2-2 draw at Leganes, which saw the hosts relegated.
Leganes had to win to stand a chance of overhauling Celta Vigo, whose draw at Espanyol proved enough to keep them up by a point.
Los Blancos - who had secured the league title on Thursday - took the lead through a header from captain Sergio Ramos.
Oscar Rodriguez through on goal in the final seconds, against his parent club, and...he just can't find the finish to save Leganes! 😱
— Premier Sports 📺 (@PremierSportsTV) July 19, 2020
Celta survive, with Leganes' valiant effort just falling short 👏 pic.twitter.com/u6EVvE0MpH
Bryan Gil equalised just before half-time, but Marco Asensio put Real back in front early in the second half before Roger Assale's 78th-minute goal set up a tense finale, but there was to be no late drama.
Zinedine Zidane's men will be back in Champions League action next month against Manchester City, trailing 2-1 from the first leg of their last-16 tie.
Elsewhere, Gerard Moreno scored twice during the closing stages as fifth-placed Villarreal beat Eibar 4-0.
Santi Cazorla was given a standing ovation as he went off late in what was the former Arsenal winger's final LaLiga appearance for the Yellow Submarine, while captain Bruno Soriano entered his retirement with a win.
Atletico Madrid finished third after a 1-1 home draw against Real Sociedad, with Adnan Januzaj's late goal securing a point for the visitors who finished sixth.
Granada - on their return to the top flight this season - secured seventh place and the chance of Europa League qualification after a 4-0 win over Athletic Bilbao as Getafe missed out following a 2-2 draw at Levante - where defender Coke scored a late equaliser.
Sevilla beat Valenica 1-0, as Los Che saw their European hopes ended. Real Valladolid had earlier defeated Real Betis 2-0 while Osasuna drew 2-2 against relegated Mallorca.
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