Lehner turned aside 9-of-10 shots in the final period, keeping the Senators in the game before Kyle Turris and Silfverberg sealed the victory with late goals.
Zach Bogosian got the only score for the Southwest Division-leading Jets, whose three-game winning streak was snapped.
Ondrej Pavelec stopped 38-of-42 shots for Winnipeg.
Aaron Carter is still in love with Hilary Duff
Ray Liotta sues skin care company over use of likeness