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The plane left London Heathrow shortly after 5pm and declared a mid-air emergency.
Flight tracker AirLive tweeted: "British Airways #BA1418 to Belfast is declaring an emergency.”
But as of 18.35pm GMT, the flight to Belfast landed safely at its destination.
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Following the safe landing of the flight, a spokesperson for British Airways told Express.co.uk that a member of the publlc had fallen ill.
Confirming the safe landing of flight BA1418, they said: "Our cabin crew cared for a customer who became unwell during the flight.
"The flight landed safely at Belfast airport."