Air fry chicken breasts at 400 degrees F (204 degrees C), until the internal temperature reaches 163-165 degrees F (73-74 degrees C). (Internal temperature will rise another few degrees while resting in the next step, and should reach at least 165 degrees F (74 degrees C).) As a guideline, air fry 7-10 minutes for small chicken breasts (5-7 oz), 10-12 minutes for medium (8-10 oz), or 12-16 minutes for large (11-12 oz).