Oregon (25-8) had its regular-season conference title chances spoiled by Utah (15-18) last weekend, but gave the Utes no chance of a repeat upset at the MGM Grand Garden Arena.
The third-seeded Ducks built a 14-point lead in the first half and kept the cushion near double figures the rest of the way to earn a spot in Saturday's title game against No. 21 UCLA.
Oregon also stifled Jarred DuBois and Jordan Loveridge, Utah's top two scorers, all night. DuBois missed all eight of his shots and went scoreless, while Loveridge had eight points on 1-of-10 shooting.
Utah shot 29 percent and went 5 of 17 from 3-point range.