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Real Sociedad was on course for a hard-earned victory at Anoeta when Alexander Isak and Mikel Oyarzabal put it two to the good early in the second half.
But Betis threw on the 39-year-old Joaquin for the last 13 minutes and he turned the tide, providing a superb assist for Sergio Canales in the 85th minute before finishing himself in the second minute of stoppage-time.
Real Sociedad dropped to sixth as a result of the defeat, three points adrift of Barcelona in fourth, while Betis climbed to eighth on the table
