Big transit hubs in Europe often are those which have the cheapest fares. From my very own personal experience, I’ve observed that London, Amsterdam, Frankfurt and Milan tend to be cheaper to fly into than other smaller sized metropolitan areas. Seem on flight search engines like google and yahoo like https://thesocialdelight.com/story5112696/an-unbiased-view-of-how-to-find-cheap-flights-to-europe-from-the-us