Preheat an air fryer to 400 degrees F (200 degrees C).
Place frozen French fries in a large bowl. Add olive oil and toss to coat. Season with salt and toss to coat again.
Spread out French fries in the basket of the air fryer, making sure to not overcrowd, and cook for 10 minutes. Turn fries over using a spatula and continue cooking until desired crispness, 2 to 4 minutes more.