The first period was a slight non-event, but the home side did look the team more capable of opening the scoring on a mild evening in Madrid.
It was Sociedad that took the lead early in the second half, however, when Xabi Prieto fired through the legs of the goalkeeper.
Atletico created a host of chances in the second period, but could not make the breakthrough as their perfect home record this season came to an end.
Read how it all unfolded in Sports Mole's minute-by-minute live commentary of the action below.
ATLETICO: Courtois; Juanfran, Godin, Miranda, Luis; Gabi, Turan, Rodriguez, Koke; Falcao, Costa
SOCIEDAD: Bravo; Mikel, De la Bella, C Martinez, I Martinez; Prieto, Illara, Zurutuza, Bergara; Vela, Griezmann