The latest triumph marked Kingsbury's sixth world title and 11th world medal.
Kingsbury became the first skier in history to defend both world titles — he also recorded the double in 2019.
"I'm just very excited and happy to win my sixth title. I know that right now in my sport, I'm the guy that's won the most ... world championships in history," Kingsbury said.
"(Monday) was a good domination from my side. (Tuesday), I wouldn't say I dominated but I was the smartest out there and I was the only one that was able to cross the line all the time."
Matt Graham of Australia was second and Ikuma Horishima of Japan was third.