Preheat the air fryer to 400 degrees F (200 degrees C).
Place cut squash in a large bowl. Add oil, five-spice powder, garlic, salt, and black pepper and toss to coat.
Cook butternut squash fries in the preheated air fryer, shaking every 5 minutes, until crisp, 15 to 20 minutes total. Remove fries and season with additional sea salt.