According to their latest results:
SIA
Passenger carried (thousand) 3,809
Revenue passenger-km (million) 18,655.0
Available seat-km (million) 26,072.6
Passenger load factor (%) 71.6
Passenger yield (cents/pkm) 10.2
Passenger unit cost (cents/ask) 8.6
Passenger breakeven load factor (%) 84.3
So, yes, if they are going out full they are making money. But they aren't, they are 72% full, and they need to be 84% full to make money.