Big transit hubs in Europe normally are the ones which have the cheapest fares. From my own private encounter, I’ve observed that London, Amsterdam, Frankfurt and Milan are generally cheaper to fly into than other scaled-down cities. I sometimes use this as a simple technique to swiftly stop by house. https://bookmarkunit.com/story19447111/the-how-to-find-cheap-flights-to-europe-from-the-us-diaries