Los Angeles (35-24-5), which defeated Vegas 3-2 in overtime at Staples Center on Monday, moved ahead of the idle Anaheim Ducks into third place in the Pacific Division with its fifth win in seven games (5-2-0).
Kyle Clifford, Tyler Toffoli, Anze Kopitar and Jeff Carter scored for the Kings, who lead the Ducks by one point and trail the second-place San Jose Sharks by two points.
"It's the time of the year where every single point counts and we put ourselves in a hole before," Kopitar said. "The four points are what really counts right now."
William Karlsson scored his team-leading 34th goal for the Golden Knights (41-17-5), who are tied with the Nashville Predators for first place in the Western Conference and trail the Tampa Bay Lightning by two points for the NHL lead.
"I didn't like the score. That's one thing," Golden Knights coach Gerard Gallant said. "But we had some chances. We just didn't compete hard enough in the blue paint, and it looked like our team was tired."