Sonic typically closes between 11:00 PM and 12:00 AM, with some locations even staying open until 1:00 AM on weekends. The closing time can vary by location and day of the week. On weekdays, most Sonic restaurants close around 11:00 PM, while on Fridays and Saturdays they often close at midnight or 1:00 AM. Sunday closing times can vary, with some locations closing as late as 2:00 AM. It is recommended to check the specific hours for the local Sonic as hours vary by location.