Generally speaking, Burger King restaurants start serving their lunch and dinner menu at 10:30 a.m. The restaurants continue serving the same types of meals until they close.
Some Burger King restaurants are open 24 hours a day, with drive-through service after midnight. These restaurants typically serve their lunch and dinner menus until about 6 a.m., when breakfast starts.
Burger King maintains both corporate restaurants as well as restaurants that are franchised and independently owned. As a result, some variation as to the timing of lunch service exists. In addition, some stores serve burgers from their lunch and dinner menu at any time of day.