Singapore Airlines Airbus A340-500. Singapore Airlines Flight 21 was the longest regularly scheduled non-stop flight in the world, from 28 June 2004 until it was discontinued on 23 November 2013. It flew from Newark Liberty International Airport to Singapore Changi Airport, covering 9,534 miles (15,343 km) in about 18.5 hours flight time. It was operated by an Airbus A340-500. Flight 21 was scheduled to take off from Newark at 23:00 EDT (11:00 SGT) and land in Singapore at 4:05 SGT (16:05 EDT).