Hamonic gave the Flames a 1-0 lead 2:26 into game when he scored his second goal of the season. Campbell could not see the shot from above the right face-off circle because of a screen by Garnet Hathaway.
"I mean, I don't score much, so it was nice. A bonus," Hamonic said. "Glad to help the team out that way, but I thought defensively our group collectively was really good."
Austin Czarnik and Noah Hanifin had the assists. Hanifin has three assists in his past four games.
Flames coach Bill Peters said Hamonic was the central figure in their strong defensive performance. Hamonic broke up a pass by Ilya Kovalchuk during an odd-man rush in the second period, and he disrupted a breakaway by Tanner Pearson from behind on a penalty kill in the third period. Pearson was able to get off a shot, but Rittich made a pad save.
"I think he was the most noticeable guy, either way, on either team. He just found a way to be involved in the game," Peters said of Hamonic.
The Kings were 0-for-3 on the power play, leading coach Willie Desjardins to say he would consider making changes to their man-advantage units and schemes.
Desjardins, who took over after John Stevens was fired as coach Nov. 4, also said he believes the Kings have to be more aggressive in generating offense, even if it means giving up more scoring chances to the opponent.
Calgary limited Los Angeles to four shots on goal in the second period after allowing eight in the first.
"I think it's always been a solid defensive team," Desjardins said. "I think that's the way they have always won, so I think some of the top guys think a little bit more defensively. The guys on the other side, [Flames forward Johnny] Gaudreau, [Sean] Monahan, they are always thinking offense. I think our guys look a little bit more defensively. Saying that, I think we have to create some systems that are going to get guys more involved. We got to force ourselves to get up ice and play more aggressive and play more offensive."