Whataburger serves breakfast from 11:00 PM the previous night until 11:00 AM each day at most locations. This means breakfast is available for a full 12 hours daily, starting late at night and continuing through the morning. Some locations 24/7, but breakfast hours specifically end at 11:00 AM. Hours may vary slightly by location. Thus, Whataburger serves breakfast as late as 11:00 AM every day.
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