Using information from the 92 official international trips taken by Royal family members between 2015 and 2020, the experts discovered they had spent a whopping £6.5 million spanning 545,161 air miles.
Spanning a total of 120,213 air miles over 25 trips, the Prince of Wales spent £2,468,501 on travel.
According to the data Prince Harry spanned 51,362 air miles over seven trips. This resulted in a total cost of £442,900.
The royals also use the Privy Purse and the Queen’s personal wealth to supplement travel and upkeep.
Private trips, including vacations, are not paid for from this budget.
Though the cost of travel expenses is revealed in an annual bill, any personal trips are not included in the public report.
This includes travel, alongside other costs such as property maintenance and staff.
Increasingly, though, younger members of the royal family are looking at new ways to keep costs down.
This includes opting to travel on commercial flights, something which Prince William and Kate have been photographed doing in recent years.