The flight was forced to make an emergency landing in Uzbekistan after an 83-year-old woman was taken ill. However, she died soon after the flight's arrival in the capital of Tashkent.
The flight departed from Islamabad in Pakistan at 00:38 this morning and was scheduled to fly into London Heathrow.
However, the British Airways flight made its emergency landing almost three hours into the flight.
BA flight tracker said: "We're very sorry, this flight scheduled from Islamabad to London has been diverted to Tashkent."
Other passengers have now been taken off the plane and are waiting at the Tashkent International Airport terminal.
A Tashkent airport official told Russia's TASS news agency the passenger had "felt bad and the captain made the decision to make an emergency landing in Tashkent."
The unnamed official added: "Immediately afterwards the passenger died.
"The airport administration does not yet know when the paperwork required in such cases will be completed and the aircraft will fly to its destination."
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