After preheated, place the London Broil steak in the air fryer basket. Ensure there is enough space around it for proper air circulation. Overcrowding also causes steam which can stop the searing process.
Cook the steak for approximately 8-10 minutes on one side for medium-rare. Then, flip the steak and cook for an additional 8-10 minutes on the other side. Adjust the cooking time based on your desired level of doneness and the thickness of the steak.
Use a meat thermometer to check the internal temperature. For medium-rare, the temperature should be around 130-135°F (54-57°C), but you can adjust it according to your preference (see the temperature guide in the article).
Once the steak reaches the desired temperature, remove it from the air fryer and let it rest for a few minutes before slicing.