Important transit hubs in Europe typically are those that have the cheapest fares. From my own personal working experience, I’ve identified that London, Amsterdam, Frankfurt and Milan are generally cheaper to fly into than other more compact cities. Very good luck with all your hunt for cheap flights to Europe. https://howtofindcheapflightstoeu92581.amoblog.com/top-latest-five-how-to-find-cheap-flights-to-europe-from-the-us-urban-news-57017944