SINGAPORE—Singapore Airlines posted its highest-ever interim operating and net profits in the first half of its fiscal year, thanks to record load factors.

Net profit rose to 1.44 billion Singapore dollars (US$1.07 billion) in the first half ended September from S$927 million a year earlier, the carrier said Tuesday. Operating profit increased to S$1.55 billion in the first half from S$1.23 billion, while revenue grew to S$9.16 billion from S$8.42 billion.