Seoul's Incheon International Airport has taken the title of world's busiest airport for international traffic, ending Dubai International's 12-year run at the top. Preliminary figures from Airports Council International (ACI), released by Incheon, show the South Korean hub handled 38.4 million international passengers in the first six months of 2026. If confirmed in ACI's upcoming World Airport Traffic Report, it will be the airport's first-ever number one ranking since opening in 2001.
The reshuffle comes down largely to geopolitics. The outbreak of the US-Iran war on 28 February forced sweeping airspace closures across the Gulf, and Dubai's passenger numbers collapsed from 7.4 million in February to 2.5 million in March. With the Gulf corridor no longer a viable transfer point for many Europe-bound routes, travellers have shifted east: Incheon reports transfer passenger numbers up 18 per cent this year. Dubai, which welcomed 95.2 million international passengers in 2025, is expected to fall outside the top five altogether.
London Heathrow slots into second place with 37.79 million international passengers in the first half of the year, just behind Incheon, while Singapore's Changi follows in third on 34.53 million.
Incheon's rise isn't purely down to rerouted flights. An infrastructure expansion completed in 2024 gave the airport capacity to handle far more traffic, and it now serves 101 airlines flying to 158 international destinations. The global boom in Korean culture — from K-dramas and K-pop to Korean food, beauty and fashion — has also fuelled demand, and the airport has climbed steadily: fifth busiest in 2018, third in 2024 and 2025, and now the top spot.
For travellers, the practical takeaway is that Gulf transfer routes remain unreliable for now. The European Union Aviation Safety Agency has extended its conflict zone advisory for the Gulf until 31 August, and there's no clear timeline for when regional air traffic returns to pre-war levels. If you're booking long-haul flights between Asia, Europe and Australasia, expect itineraries that route through Seoul, Singapore or other Asian hubs rather than Dubai or Doha — and check connections carefully when booking, as schedules in the region are still shifting. The good news for anyone transiting through Seoul: Incheon is consistently rated one of the world's most comfortable airports for layovers, with easy access into the city if you have a few hours to spare.