Maltais, the Olympic silver medallist from Petite-Riviere-St-Francois, Que., won her qualifying round before emerging victorious in the big final. The Canadian was followed by French racers Nelly Moenne Loccoz and Chloe Trespeuch.
The victory was the 15th of Maltais' career.
"I'm really happy about the win," she said. "I wanted to take it easy this year because it's my last World Cup season but I always want to finish on the podium.
"And I knew I could win this one. I like the course and I knew that I can be fast here."
Moenne Loccoz leads the World Cup standings ahead of Maltais heading into the final event next weekend at La Molina, Spain.
Australian Alex Pullin won the men's race ahead of Lucas Eguibar of Spain, who won Saturday's event and leads the World Cup standings. Hill, of Vernon, B.C., was third for the second straight day.