United Airlines Flight 2811 from Amsterdam transmitted code 7700, indicating a general emergency while flying over UK, according to aviation tracking website FlightAware.
United flight 2811 had been bound for Chicago, but turned around an hour into the journey.
A statement on the Flightstats website said: “This flight is currently redirected back to the origin airport. It appears that it is returning to AMS.”
A United Airlines spokesman said: “United cargo flight 2811 returned to Amsterdam Schiphol Airport today due to a technical issue. The Boeing 787-10 aircraft landed safely at 12.43pm local time. Our maintenance team is currently inspecting the aircraft.”
A Amsterdam Schiphol Airport spokesman said: “The plane came back to Schiphol out of precaution, due to a technical cause.”