The Boeing 767-400 aircraft was initially expected to land back at Heathrow at 1.15pm but flight radar websites showed the plane circling at 12,000 feet for a number of hours.
Scary flight!! Had to turn around and fly back to Heathrow 5 hours after take off!
United Airlines confirmed Flight UA28 finally landed safely at Heathrow at shortly before 4pm.
A spokesman for United Airlines said: “Our maintenance team is currently inspecting the aircraft. Our customer service team at Heathrow is providing assistance to customers and is making arrangements for them to complete their journeys.
“We regret any inconvenience experienced by our customers.”