Free transit voucher worth S$20 (~$21.50) at changi airport if you have a silk or singapore airline ticket. Also get up to S$120 (~$130) off dining and shopping too.
WHO IS ELIGIBLE?
Passengers travelling on Singapore Airlines (SQ) and/or SilkAir (MI) ticketed and operated flights into and out of Singapore with 13 digits e-ticket numbers begin with 618, 629 or 086. This benefit will also be extended to passengers taking the following flight numbers: SQ4281, SQ4282, SQ4283, SQ4284, NZ281, NZ282, NZ283, NZ284, NZ295 or NZ296 (operated by Air New Zealand) and TR596 or TR597 (operated by Scoot).
Passengers must be on transit in Changi Airport on both legs of their journey, which means Singapore is neither the point of origin nor the end destination. Transit passengers on one-way journey or ticket are not eligible.
Transit means a layover at Changi Airport of not more than 24 hours. This is calculated from the Scheduled Time of Arrival (STA) of the arriving flight into Changi Airport to the Scheduled Time of Departure (STD) of the connecting departure flight out of Changi Airport.
See more Terms at ChangiAirport.com
It's worth noting that it is only up until March next year.