The Duke and Duchess of Cambridge flew to Aberdeen on Scotland's east coast. They were traveling to Queen Elizabeth's summer residence at Balmoral Castle, Reuters news agency reported.
"We were delighted to welcome the Duke and Duchess of Cambridge and their families on board one of our flights again, this time when they flew from Norwich to Aberdeen with our franchise partner, Eastern Airways," a FlyBe spokesman told CNN in a statement.
FlyBe declined to tell CNN how much the flight had cost. Prices for that route start at £ 73 ($ 89), with a fully flexible fare costing £ 249 ($ 303).
Kensington Palace told CNN that it had no comment on the matter.
Earlier this week, the Duke and Duchess of Sussex faced criticism after using private jets to fly to the South of France and Ibiza in two trips just days apart
Environmental campaigners accuse the pair of hypocrisy, saying that Harry and Meghan's actions contradict their public stance on climate change, giving aviation is one of the world's major polluters and responsible for more than 2% of global emissions.
Prince Harry says he is only having two children & # 39; maximum & # 39; for the sake of the planet ”
Earlier in August, Harry said: "Maximum," in order to protect the planet, during a conversation with activist Jane Goodall in an edition of British Vogue guest-edited by Meghan , He also spoke about the "terrifying" effects of climate change.
Singer Elton John defended the royal couple, however, and said "distorted and malicious." David Furnish had paid for the private jet of Nice for security reasons.
"After a hectic year continuing their hard work and dedication to charity, David and I've been waiting for a private jet flight, he posted on Twitter.
A friend of criticism, following years of "undeserved hate and abuse."