Kingsbury, from Deux-Montagnes, Que., comfortably won the men's event with a score of 90.54 points in the final. Russia's Alexandr Smyshlyaev was second with 87.97 while Marc-Antoine Gagnon of Terrebonne, Que., finished third with 87.69.
Montreal's Dufour-Lapointe scored 86.86 points in the women's final, edging American rival Hannah Kearney (86.43). Andi Naude of Penticton, B.C., finished third with 76.51 for her first career World Cup podium appearance.
Kingsbury, who leads the overall men's World Cup standings by 204 points over teammate Philippe Marquis, said he has taken on a leadership role with the team after the retirement of two-time Olympic champion Alex Bilodeau.
"I have a lot of experience on the World Cup circuit making podiums, so we're feeding each other and helping each other," Kingsbury said. "We're extremely close, and I try to lead by example since Alex is not there."
Dufour-Lapointe moved past Kearney into top spot in the women's overall standings with the win.
"You don't want to let any doubt into the judges' heads," Dufour-Lapointe said. "I'm just so proud of my skiing today."
Naude said her first World Cup medal is a confidence booster after a couple of tough stops on the tour.
"I just came off a couple of hard competitions, and I had a couple of days to regroup at home and really think about what I've done, and I came into (Thursday) in a good state of mind," she said.