Kingsbury, from Deux-Montagnes, Que., finished with a score of 26.39 as Canada swept the men's podium.
Montreal's Alex Bilodeau was second with 25.29 points, while Marc-Antoine Gagnon, also from Montreal, followed in third at 24.85.
Kingsbury, the reigning moguls world champion, is set to compete in his first Winter Games next month in Sochi, Russia. Bilodeau, meanwhile, won Olympic gold in Vancouver four years ago.
"This is my favourite course," said Kingsbury, after winning at the site of the 2002 Winter Games. "To win here, you need to be technically strong. But, my favourite part of tonight was being on the podium with my friends and teammates. Alex skied really well, and I'm really excited for Marc-Antoine."
Gagnon meanwhile was happy to celebrate his first World Cup podium.
"You know, I didn't think too much," said Gagnon. "I really wasn't stressed and I was feeling great. So I just let it go. In the end it was my jumps that made the difference."
Canada finished with five medals at the World Cup event after Montreal's Chloe Dufour-Lapointe won the women's silver with a score of 23.45 while her sister Justine (23.33) took third.
"Tonight I pushed myself in speed and height," said Chloe Dufour-Lapointe. "But it is not my limit. I'm on my way to Sochi and I plan on going higher and faster."
American Hannah Kearney won gold with a 24.83.
Canada's Olympic freestyle team will be named Jan. 20 in Montreal.