Following a sluggish first half, in which the Aztecs trailed by nine at the break, San Diego State rallied for a 70-63 win on Sunday.
Xavier Thames scored 19 points, and Winston Shepard added 17 for the Aztecs (7-1), who won their sixth straight.
C.J. Wilcox led Washington (4-4) with 17 points. Nigel Williams-Goss added 14 for the Huskies.