Ah, the million-dollar question. You’re on a 6 AM flight and your stomach is growling like a jet engine. Most Heathrow McDonald’s follow the airport’s operating hours. They open early, around 5:00 or 6:00 AM, but they close by 10:00 or 11:00 PM.
If you’re on a red-eye, you’re out of luck. Unless you find one of those 24-hour WH Smith shops and eat a sad, pre-packaged sandwich. The McDonald’s staff need sleep too, you know. They’re probably dreaming of the day someone doesn’t ask for “extra extra extra ketchup.”
So no, you can’t roll up at 3 AM for a Quarter Pounder. That’s a special joy reserved for late-night truck stops in Ohio, not Heathrow’s polished halls.