It's been a tough year for the Kings, who came into the night sitting last in the Western Conference and second last in the NHL.
They were 1-8-1 in their last 10 outings.
However, on this night, they stepped up their game, created chances and that - combined with their netminding - was enough to win the day.
At the other end of the ice, David Rittich was no pushover, though, making his fair share of 10-bell stops.
The first period was choppy and, at times, sloppy.
Both teams had difficulity establishing zone time and setting up and cycling the puck, thanks to fobbled passes and interceptions.
However, the Kings did test Rittich on a handful of occasions, none better than Trevor Moore's short-handed breakaway, where the Kings forward barrelled in but Rittich stood tall to deny his five-hole attempt.
The Flames best crack was a one-man effort by Mikael Backlund, who hung his arm out to protect his stick and puck and drove around Kings defenceman Kurtis MacDermid for an in-tight shot on Petersen, along with two or three whacks at it in the crease before the goalie was able to cover up and the whistle went.
Milan Lucic - who came into the game with two goals and five points over the Flames dominating two-game winning streak - brought the crowd at the Staples Center to its feet 6:23 into the second period, when he squared off with the hulking MacDermid.
The two heavyweights had a quick but spirited affair with some big punches thrown and landed, that ended when MacDermid fell down and the linesman jumped in as he tried to stand back up, appearing to want to keep going
The Kings were honouring the LA Dodgers during Wednesday's game, so it was perhaps fitting that both goalies were pitching a no-hitter until nearly the halfway mark of the middle stanza.
But then the goals came fast and furious.
Mikael Backlund scored his second in as many games, taking a pass from Matthew Tkachuk and one-timing it as he dropped to one knee as he skated into the slot for his eighth of the season.