London City Airport (LCY) is technically the "easiest" and closest, located just 6 miles from the city center with direct Docklands Light Railway (DLR) access. However, for the majority of international travelers, London Heathrow (LHR) is the most convenient due to its superior transit links. The Heathrow Express reaches Paddington Station in just 15 minutes, while the Elizabeth Line and the Piccadilly Line (Tube) provide direct, cost-effective routes to the heart of London in 35–50 minutes. While Gatwick, Stansted, and Luton offer "Express" trains, they are much further out (30–40 miles) and take significantly longer to reach the center. If your destination is the financial district or Canary Wharf, London City is unbeatable; for almost everywhere else, Heathrow’s variety of fast and affordable connections makes it the preferred gateway for a seamless arrival.