An Australian woman has died on an international flight.

The death of an Australian woman on an international flight that landed in Sydney is not being treated as suspicious amid reports the passenger was a suspected drug mule.

Emergency services were called to Sydney International Airport about 6.50am on Thursday after staff requested assistance for a 42-year-old woman who had died on a Delta flight from Los Angeles on its way to Perth.

Passengers were left waiting for more than 90 minutes on the tarmac as police boarded the plane and established a crime scene.

It was suggested the woman might have been a drug mule, according to 2GB Radio.

Police declined to comment on reports the death was drug-related but said it was not being treated as suspicious.

“We don’t believe she was travelling with anyone else,” a police spokeswoman told AAP on Thursday.

Police were also investigating other possible causes of death including self-harm or natural causes.

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*Featured image via Getty.