The Duke of York - nicknamed 'Airmiles Andy' - clocked up a taxpayer-funded travel bill of more than £350,000 in 2011 as he flew around the world in his role as the UK's roving business ambassador, Buckingham Palace accounts showed today.
That figure is £20,000 more than the year before, despite Andrew stepping down from his position as the UK's Special Representative for International Trade and Investment in July last year.
But in the months that followed he continued to travel to countries in this role as he had commitments to fulfil.
Accounts for the 2011/12 financial year showed that the Duke carried out five major tours promoting UK firms and encouraging inward investment after leaving his post.
Andrew gave up the job following the intense scrutiny he faced over his relationships with a series of controversial figures, including a convicted paedophile.
The Duke had been dogged by accusations of a lack of judgment about his links with American billionaire Jeffrey Epstein, who was sentenced to 18 months in prison in 2008 for soliciting a minor for prostitution.
Andrew carried out seven major business tours in total travelling to the Middle East and South East Asia, visiting emerging markets like China and Indonesia with a handful of staff.
The single biggest trip was a seven-day tour of Saudi Arabia which cost £81,000 for chartered air travel, with the total bill for all scheduled and chartered flights during 2011/12 adding up to £354,667.
The most expensive royal trip during the last financial year was the Prince of Wales's official visit to Kuwait and Qatar last autumn and then on to South Africa and Tanzania when he was joined by the Duchess of Cornwall.
The cost for the chartered flights was £460,387, but it is understood it would not have been possible to complete the tour by scheduled services.
Charles and Camilla's official tour of Portugal, Spain and Morocco in April last year generated a £38,333 bill for flights.
The cost of the Queen's historic visit to the Republic of Ireland with the Duke of Edinburgh in May last year was £47,500 for a chartered return flight from RAF Northolt in London to Dublin and Cork.
Charles' two-day regional visit to Middlesbrough, Teesside, Redcar and Burnley by royal train last October was the most expensive trip by this mode of transport, coming in at £38,016.
The cost of the Duke and Duchess of Cambridge's flight home from California after a visit to the US state last summer came to £51,410 for a total royal party of nine people.
William and Kate and their adviser Sir David Manning were upgraded from business to first class seats on the scheduled British Airways flight.
After the riots in London last summer Charles and Camilla took a return flight from Scotland to visit communities in Tottenham, Hackney, Lambeth and Croydon for £19,583.
Republic, the organisation which campaigns for an elected head of state, highlighted how David Cameron's visit to Afghanistan last December cost just over £2,000 compared to the royal couple's trip.
Graham Smith, Republic's chief executive, said: "It beggars belief that it costs the taxpayer more to send Charles to east London than it does to send the Prime Minister to Afghanistan.
"I think most people, monarchist and republican alike, would find that impossible to justify."