Los Angeles remained two points ahead of the Seattle Kraken for third in the Pacific. Seattle, which won 4-1 at the Arizona Coyotes on Monday, has a game in hand.
It was Korpisalo's first shutout of the season and fourth in the NHL.
"I felt pretty good, and the guys let me see the puck, and my job is to take care of the rest," said Korpisalo, who is 6-3-1 in 10 games with the Kings after being acquired along with Vladislav Gavrikov in a trade with the Columbus Blue Jackets on March 1 for Jonathan Quick and two NHL Draft picks.
Gavrikov, Arthur Kaliyev and Drew Doughty scored for the Kings (46-25-10), who had lost three straight and five of seven (2-5-0).
"We were tight defensively," said Los Angeles forward Phillip Danault, who had an assist. "It's the right time of the year, that's for sure. We want to keep building, obviously."