Durant connected on 11-of-24 shots to reach the 30-point plateau for the fifth time in six games. Westbrook helped out with nine assists and seven rebounds.
Oklahoma City also got big contributions from Serge Ibaka (16 points, seven boards) and Thabo Sefolosha (14 points) in posting its third straight win after dropping the two previous contests.
The Suns got 24 points and six rebounds from Luis Scola but it wasn't enough to prevent their sixth consecutive loss.
Goran Dragic supplied 16 points and eight assists for Phoenix.