Definately SQ's YVR-ICN-SIN flights. One would have to book very early in advance to secure Y or J seats on board this flight regardless peak or low season. The flight operates 3x/weekly only. It operates under that frequency because of the Canadian government's unwillingness to grant SQ further frequency and access to the Canadian market so SQ has no choice. I'm sure SQ would love to convert it into a daily operation as demand has already proven.