In a small bowl, stir together the sugar, salt, and cinnamon. Set aside.
Using an air popper, pop the corn kernels into a large bowl. Meanwhile, combine the butter and chile oil in a small bowl. As the large bowl begins to fill with popcorn, alternately drizzle the oil mixture over the popcorn and sprinkle it with the cinnamon-sugar, occasionally tossing to coat.
When the popcorn stops popping, use your hands to toss everything together and ensure that the ingredients are evenly distributed. Serve immediately.