"London Airport" typically refers to the collective system of its six major airports: Heathrow, Gatwick, Stansted, Luton, London City, and Southend. In 2026, this collective network serves over 400 unique destinations worldwide, making London the most connected aviation hub on the planet. Heathrow (LHR) alone serves approximately 210 destinations in 80 countries, acting as the primary gateway for long-haul flights to the Americas and Asia. Gatwick (LGW) adds another 190+ destinations, with a heavy focus on European leisure and increasing long-haul budget routes. Stansted and Luton provide the bulk of the short-haul "Low Cost" connections to nearly 150 European cities. In 2026, the expansion of the Elizabeth Line and improved rail links between the airports have made "connecting through London" a multi-airport reality for many global travelers. While no single airport hits the 400 mark alone, the London "cluster" ensures that you can reach almost any commercial runway in the world with no more than one stop.