Of 14, 18 or 24 hours, the scheduled length of the world's longest nonstop flight, from Singapore to NYC
| TheExpeditioner ... [PAR] Nov 2, 2012 ... Well, it was actually 14 hours, 55 minutes, by far the longest flight I had ever ... 
longest scheduled nonstop commercial flight in the world is Singapore Airlines 
Flight 21, clocking in at a whopping 18 1/2 hours (scheduled length).