Chick-fil-A serves breakfast from 6:30 AM to 10:30 AM, Monday through Saturday. They do not serve breakfast on Sundays as all locations are closed that day. After 10:30 AM, the breakfast menu is no longer available and the restaurants switch to their regular lunch and dinner menu. These hours may vary slightly by location, so it's a good idea to check your local Chick-fil-A for exact times.