AirAsia has 20% off promotion on base fares for flight across it’s network.
Tigerair has their Tigerflash campaign on going on today (Thursday 10.3.) and there are multiple cheap flights from Singapore available. For example fly from Singapore to Penang from only S$34 or from Singapore to Jakarta from only S$39.
AirAsia has launched their latest BIG Sale with fares as cheap as 2$ within Southeast Asia.