Prince George, who turns four this month, walked down the steps of the plane while his two-year-old sister, Charlotte, was carried down by her mother, Kate.
Her 3-year-old brother, Prince George sported a plaid button-down shirt with navy shorts for the occasion and was seen holding his father's hand as he curiously looked around.
Prince George and sister Charlotte peering through the plane window.
Here's hoping we get to see more of the adorable twosome over the next few days and of course, Kate is sure to provide us with some gorgeous fashion inspiration owing to all the events, meetings and galas the couple will attend during the royal visit.
William and Kate's trip, taken at the request of the Foreign and Commonwealth Office, is likely to be seen as another Brexit diplomacy tour in a bid to maintain and strengthen the UK's relations with Europe as the United Kingdom departs from the EU.
Prince William and Kate will meet again with the Polish first couple before heading to Germany on Wednesday morning.
William and Kate have taken their children on tour before, travelling to Canada with them previous year where they enjoyed an open-air party for youngsters. In Germany they are due to visit the Berlin Holocaust Memorial.
While the couple are In Poland, they will visit the site of Stutthof concentration camp where 65,000 people were murdered by the Nazis.
A boat race is planned in the Germany city of Heidelberg, which is twinned with Cambridge.
Their five-day tour of the two European countries is at the request of the Foreign and Commonwealth Office.
The appearance of Team Cambridge, of course, may not impact any negotiations, but the Foreign Office believes it will help strengthen bilateral ties once the United Kingdom finally quits the EU.
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