It was Korpisalo’s first start since Dec. 27.
Sean Kuraly had a goal and assist, and Tanner Jeannot had two assists for the Bruins (23-19-2), who have won three of their past four.
Connor Zary scored for the Flames (18-22-4), who have lost four straight games, including 4-1 at the Montreal Canadiens on Wednesday. Dustin Wolf, in his eighth consecutive start, made 26 saves.
Kuraly gave the Bruins a 1-0 lead at 9:48 of the first period. Charlie McAvoy made a stretch pass to Jeannot, who controlled the puck along the right wall and banked a pass off the boards to Kuraly before the forward beat Wolf with a wrist shot from high in the right face-off circle to the stick side.
Elias Lindholm made it 2-0 at 12:06. The Bruins broke in on a 3-on-2 when Marat Khusnutdinov made a spinning drop pass in the right circle to David Pastrnak, who quickly fed Lindholm for a one-timer from the left circle.
Mason Lohrei increased the lead to 3-0 at 14:02 of the second period. He faked a slap shot from the top of the left circle, pulled it back with a toe drag past a sprawling Adam Klapka and scored with a wrist shot.
Casey Mittelstadt pushed the lead to 4-0 at 17:59, chipping a rebound over Wolf’s shoulder after his initial shot was blocked.
Zary cut it to 4-1 at 18:44. He gained control of the puck behind Boston’s net, brought it out to the right circle and beat Korpisalo to the far side.
Korpisalo makes 28 saves, Bruins cruise to win against Flames
