1-844-414-9223 To improve the experience of flying, Singapore Airlines provides the most affordable flights in addition to additional perks. Besides this, how can I upgrade my seat on a Singapore flight? As you travel to your destination of choice, process makes the experience more enjoyable. Call the above-mentioned official number if you require further information about the airline's seat upgrading program. The airline managers will give you the pertinent details about the seat upgrade at this point.