How high does Concorde fly?

The Concorde (Concord by the British spelling) is certificated to fly at a maximum altitude of 60,000 feet. It normally cruises at between 55,000 and 60,000 feet.

British Air also used the French spelling Concorde.
The Concorde's maximum cruise altitude was 18,300 metres (60,000 feet), and its speed was an average cruise speed of Mach 2.02 (about 2,140 km/h or 1,330 mph).