The Prince of Wales spent more than £1.3m on travel for the last financial year, topping the Royal Family’s budget.
His globe-trotting accounted for more than half of the £2.7m spent by the firm for 2018/19, the report reveals.
Prince Charles and the Duchess of Cornwall’s most expensive trip was their royal tour of the Caribbean and Cuba in March, which racked up to £416,576.
The couple also travelled to Africa in November 2018 at a cost of £216,000 and £159,000 for their official visit to Greece and France in May.
Charles, 70, also used the Royal Train the most, which works out at around £20,000 per journey.
Royal finance expert David McClure told Yahoo UK earlier this year: “The Royal Train is very expensive, it costs almost a £1 million a year to run and last year was probably only used about a dozen times, so more than likely, it is nearing the end of its life and when the Queen goes, the Royal Train will probably go too.”
The figures for royal travel, included in the annual royal accounts, do not give details for journeys costing less than £15,000 - meaning the true value is higher.
The royals also took 204 journeys by helicopter costing £688,845 in total and 43 charter flights at a cost of £369,778.
Clarence House released a montage of Charles and Camilla’s year, which saw them notch up 638 official engagements, travelling to 82 UK towns and 14 countries.
The overall cost of travel by members of the royal family in 2018-19 was down £100,000 to £4.6 million.