The passenger, believed to be a man who was travelling with his wife and child, passed away while flying from New Delhi to Singapore on Wednesday.
The incident is reportedly being investigated by police, according to The Straits Times.
The passenger, believed to be a 34-year-old Indian national, was pronounced dead on the flight by doctors, the website reported.
A source speaking to Channel NewsAsia said the passenger was a male and had been with wife and child.
But a Singapore Airlines spokesperson did not confirm whether the passenger had been travelling with their family and said further details regarding the incident could not be shared “for privacy purposes”.
The spokesperson told the website: “We can confirm with regret that a passenger had passed away on flight SQ403 from New Delhi to Singapore [on Wednesday].”
The plane was not diverted and landed at Singapore Changi Airport on Wednesday afternoon. “Our condolences go out to the family of the passenger at this time,” they said.
News.com.au reported on Thursday that police in New South Wales were investigating the death of a 70-year-old man, who passed away on a flight travelling from Santiago to Sydney.