Dorlan Pabón scored in the 66th minute to earn a draw for Los Beticos.
Pabón slotted home into the lower left of the net after getting a pass from Rubén Castro and finishing the move with a right foot.
Real Sociedad had captured the lead in the 62nd minute when Xabi Prieto scored.
Real Betis's Pabón demonstrated a knack for finding the back of the net, and finished the match having scored two goals. His goals came in the 49th and 66th minutes.
Pabón ended the game with 22 completed passes and six total shots.
Real Sociedad were caught offsides on numerous occasions in this game.
The linesman raised the flag against Erreala six times during the match.
Carlos Vela had four shots for Real Sociedad, more than any of his team-mates.
The combination of Xabi Prieto to Vela was the most common during the match, as the two players connected 13 times.
Los Verdiblancos enjoyed possession of the ball for 43.9% of the contest.
Real Betis had 17 shots, including four on target.
The most effective of Beticos's three substitutions was Castro, who, after replacing Juan Carlos in the 63rd minute, assisted on Pabón's goal.