Plattsburgh's goals were scored by Jason Sousa, David Widemaier, and Pat Simone.
Plattsburgh was up 1-0 at the half, but scored its two remaining goals within 12 minutes of the second half.
Buffalo State only had three shots all game.
Goaltender Shawn McDonell (W. Seneca/W. Seneca East) made seven saves.
Buffalo State's next game will be on Friday, October 14th at 4 p.m. at Coer Field.