The best time to fly to Vatican City is during the spring (April to May) and fall (September to October) seasons. During these months, Rome experiences mild temperatures, fewer crowds compared to summer, and generally lower airfares, making sightseeing around Vatican City more comfortable. Summer months from June to August tend to be hot and crowded, with higher flight prices due to peak tourism, while winter from November to February offers cheaper flights and fewer visitors, except around Christmas and Easter when demand increases. Flying during the shoulder seasons provides the best balance of pleasant weather, manageable crowds, and affordable airfare.