Williams had a goal and two assists and scored the winning goal in a long shootout Saturday night and the Los Angeles Kings won 4-3 over Calgary, snapping the Flames' six-game winning streak.
"We haven't won here for such a long time so it felt good," said Williams. "This is always such a tough arena to play in. Calgary is always a really tough team to play at home."
Los Angeles had lost 10 straight at the Saddledome since December 2005.
The victory moves the Kings back into playoff position, passing Minnesota to move into eighth in the Western Conference.
"I had two shootout attempts earlier this season and missed them both, so I knew I wasn't going to be in the top few," Williams said. "But when I got my chance, I knew I was going to shoot because a lot of guys tried to deke and the two guys before me missed the puck."
Los Angeles had lost 10 games in a row at the Saddledome going back to 2005.
Alex Tanguay had two goals and an assist to lead Calgary. Robyn Regehr also scored for the Flames, who missed a chance to move into a playoff position for what would have been the first time since Oct. 29.
Brendan Morrison had three assists, extending his point streak to seven games.
"We were down three times in the game and we came back, we hit multiple posts in the shootout, we were right there," Morrison said. "We can't hang our heads, it was a pretty good effort overall."
Both teams entered the game with 58 points each, part of a three-way tie for ninth place in the Western Conference.
Three times Los Angeles took a lead and three times Calgary came back to tie it.
Tanguay's second goal of the night at 11:15 of the third period tied it 3-3, with the Flames already on the power play and a delayed penalty coming up to Jarrett Stoll for hooking.
Morrison flicked a no-look backhand pass toward the front of the net that slipped through untouched and landed on the stick of Tanguay, who rifled it in as goalie Jonathan Quick slid across.
After picking up a pair of assists in the first period, Williams' 19th goal of the season at 11:02 of the second period broke a 2-2 tie.
After converting their first man advantage, the Kings broke a 2-2 tie at 11:02 of the second period on what was virtually another power-play goal.
Coming seconds after Rene Bourque's penalty had expired, Williams' goal on a rebound from a scramble in front of the Flames net was the result of an extended stretch of pressure in Calgary's end.
"It's a critical time of the year to put some points on the board and keep climbing in the standings," Kings coach Terry Murray said.
Calgary trailed 2-1 entering the second period, but it only took them 45 seconds to get back even.
Pressure by the Flames' top line led to a goal by Tanguay, who was set up in front by Morrison and had the entire top half of the net to shoot at with Quick sprawled on his belly.
"It was a hard fought battle, it could have gone both ways," Tanguay said. "When you go to the seventh round in the shootout, it's pretty much coin flip."
Los Angeles took its second lead of the night at 6:17 of the first period when Brown's power-play goal put the Kings ahead 2-1.
Brown first whacked a bouncing puck wide, but collected it again and put just enough on it to get it over the goal line.
The game got off to an unusual start.
In a matchup between two of the hottest goaltenders in the league in the past couple weeks, each team scored in the game's opening 90 seconds with the goal scorer for each team being the most unlikeliest of players.
At 0:39, Scuderi lobbed a shot toward the Flames net that fooled Kiprusoff and squeezed between his pads.
It was the second goal of the season for Scuderi, who had only scored once in his previous 205 games and had never scored more than once in any of his six previous NHL seasons.
It took the Flames only 42 seconds to tie it with Regehr getting an equally rare goal.
Unable to see threw traffic in front, Quick never moved on Regehr's rising wrist shot from the blue line that went in just inside the goal post.
It was the first goal in 65 games for Regehr, who had only scored twice in his previous 224 games.
Notes: Fan favorite Craig Conroy, who retired Friday, received a lengthy standing ovation when, during a break in play in the first period, he was shown on the scoreboard video screen sitting among the Flames management. ... Lance Bouma, 20, from Provost, Alberta., made his NHL debut for Calgary. He played left wing on a line with Mikael Backlund and Tom Kostopoulos. ... Calgary LW Niklas Hagman (lower body) missed his second straight game. ... Calgary coach Brent Sutter coached his 300th NHL game. ... Brown is the lone player remaining from the Kings team that last won in Calgary on December 21, 2005. ... The Kings improved to 17-0-0 when leading after two periods.
|Rob Scuderi (2) ASST: Justin Williams (22), Ryan Smyth (15)|
1 - 0 LAK
|Robyn Regehr (1) ASST: Alex Tanguay (28), Brendan Morrison (21)|
1 - 1 Tie
|PPG - Dustin Brown (18) ASST: Justin Williams (23), Jack Johnson (32)|
2 - 1 LAK
|Alex Tanguay (13) ASST: Brendan Morrison (22), Jarome Iginla (26)|
2 - 2 Tie
|Justin Williams (19) ASST: Andrei Loktionov (2), Dustin Brown (21)|
3 - 2 LAK
|PPG - Alex Tanguay (14) ASST: Brendan Morrison (23), Jarome Iginla (27)|
3 - 3 Tie
|1||R. Bourque||M. Handzus|
|2||A. Tanguay||J. Stoll|
|3||O. Jokinen||A. Kopitar|
|4||C. Glencross||J. Johnson|
|5||B. Morrison||D. Brown|
|6||J. Iginla||D. Doughty|
|7||J. Bouwmeester||J. Williams|
|Power Play %||19.0%||18.8%|
|% on Road||15.3%||19.0%|
|% at Home||22.1%||18.7%|
|Alex Tanguay Hooking against Drew Doughty|
|Willie Mitchell Holding against Curtis Glencross|
|Matt Greene Roughing against Lance Bouma|
|Rene Bourque Hooking against Rob Scuderi|
|Rene Bourque Hooking against Rob Scuderi|
|Robyn Regehr Hi-sticking against Dustin Brown|
|Anze Kopitar Holding against Jarome Iginla|
|Jarret Stoll Tripping against Mark Giordano|