Number four, meanwhile, is London Heathrow Airport, the busiest airport in Europe. London-Heathrow has been Europe's busiest airport since 2023, and while it was ranked lower from 2020 to 2022, London-Heathrow had been ranked as Europe's busiest airport for decades beforehand. London has by far the world's busiest airport system, followed by New York with five (John F Kennedy International Airport, Newark Liberty International Airport, LaGuardia Airport, Westchester Airport, Long Island MacArthur Airport) and Tokyo (Haneda Airport, Narita International Airport). Worldwide, London Heathrow Airport ranks fourth in scheduled seats, behind Tokyo Haneda Airport, Dubai International Airport, and Atlanta Hartsfield-Jackson International Airport. Airport International Seats Primary Airlines Dubai International Airport 62.43 million Emirates FlyDubai London Heathrow Airport 48.97 million British Airways Virgin Atlantic Seoul Incheon International Airport 43 million Asiana Airlines Korean Air Singapore Changi Airport 42.57 million Singapore Airlines Scoot Amsterdam Schiphol Airport 41.33 million KLM TransaviaWithin Europe, the next nine busiest airports are Istanbul Airport, Paris Charles de Gaulle Airport, Amsterdam Schiphol Airport, Frankfurt Airport, Madrid-Barajas Airport, Barcelona El Prat Airport, Rome Fiumicino Leonardo da Vinci Airport, Istanbul Sabiha Gökçen Airport, and Munich Airport.