The Dragons' Den star and entrepreneur was pictured at Heathrow Airport in London with girlfriend Nigora Whitehorn, after catching a long haul flight from Brisbane, Australia via Dubai.
Duncan, 66, was eliminated on day 19 and has since described his time in the jungle as amazing - despite the lows such as arguing with Lady C and getting that black eye. DUNK DUNCAN!
On tonight's Coming Out show he says: "My jungle experience was life changing, I wouldn't change this experience for the world. I have absolutely no regrets for doing it, I'm so glad that I did it."
He added on Twitter: "Thank you all very much for the kind comments about my stint on I'm a Celebrity On the whole I really enjoyed & was glad to get to the end."
Duncan donated his £100,000 fee for the show to Operation Smile, a charity that helps children around the world who are suffering from facial deformities. He's a celebrity ambassador for the organisation and has said his prize money will fund 150 operations on children in Ghana.