Kingsbury has won the event at the 1988 Olympic venue for the last four years and finished ahead of Olympic champion and Canadian team-mate Alex Bilodeau while American Patrick Deneen completed the podium.
"Calgary is the best World Cup venue for me, I was very confident and it's looking good for the Olympics in Sochi," said Kingsbury.
Canada's Justine Dufour-Lapointe topped the women's field, with American Olympic champion Hannah Kearney second and her sister, Chloe, third. Indeed, a third Dufour-Lapointe sister, Maxime, was fifth.
"It's awesome to win a gold medal at home," said Dufour-Lapointe. "I'm in a great position ahead of the Olympics."
Great Britain's Ellie Koyander finished 35th in qualifying for the women's event.