The Canadian freestyle skier overtook countryman and world champion Mikael Kingsbury after finishing second to him in the previous three World Cup events this season.
Bilodeau scored 24.62 points with Kingsbury just 0.07 adrift on 24.55 – Russian Alexandr Smyshlyaev rounded off the top three with 23.80.
"I've done everything in my power to be ready for the Olympics," Bilodeau said. "After that, I'll have other goals in life and I'll move on. But it's been an amazing journey."
In the women's moguls USA's Hannah Kearney won her sixth straight moguls gold at Deer Valley and she admitted the home crowd spurred her on.
Kearney has won three of four World Cups this season and will be looking to defend her Olympic title in February.
She scored 25.21 points on Saturday after winning with 24.83 on Friday, and finished ahead of Yulia Galysheva in second and Maxime Dufour-Lapointe in third.
"At practice I thought there's a chance this is a larger crowd than we'll have at the Olympics," said Kearney.
"There's certainly more people cheering for me than there are going to be at the Olympics, so I used it and tried to put on a show."