Matt Moulson tallied in a four-goal second 3 win over the Montreal Canadiens.
P.A. Parenteau, Jay Pandolfo and Mark Streit also scored for the Islanders, who snapped a four-game losing skid.
Evgeni Nabokov started in net but left the game in the first period with a groin injury. He made two saves before Rick DiPietro came on to make 24 stops.
Max Pacioretty, Brian Gionta and Erik Cole netted goals for Montreal, which got 29 saves from Peter Budaj.