Europe's aviation landscape has shifted: Istanbul Airport has overtaken London Heathrow as the world's most connected hub, according to the latest Megahubs Index by aviation data firm OAG. The Turkish gateway now offers potential connections to 337 global destinations, edging out the British airport that had long held the top spot.
The rankings measure the number of possible connections between inbound and outbound flights within a six-hour window on the busiest day of the year—this year, Sunday 2 August—and the number of destinations served. Istanbul, already the world's eighth busiest airport by capacity, climbed to first place as Heathrow's connectivity fell by 6% compared with the same day in 2024.
OAG attributes Heathrow's decline partly to ongoing disruption in Middle East schedules, with capacity to the region down 25% this August. The knock-on effect has been felt across European hubs that rely on eastward connections, though several still rank prominently.
Europe's strong showing in the top ten
Amsterdam Schiphol holds third place, Frankfurt International is seventh, and Paris Charles de Gaulle comes in ninth. These airports, along with Istanbul and Heathrow, give Europe five of the world's top ten megahubs—a sign of the continent's enduring role as a global transit crossroads.
Beyond the top ten, European airports feature heavily in the top 50. Madrid Adolfo Suárez-Barajas sits at 18th, Istanbul's second airport Sabiha Gökçen at 21st, Athens at 22nd, Munich at 23rd, Rome Fiumicino at 27th, Barcelona at 41st, and Zurich at 45th. In total, 12 of the top 50 most connected airports are located in Europe.
The rise of Istanbul reflects a broader trend of Gulf and Turkish carriers expanding their networks, often at the expense of traditional Western European hubs. Istanbul's geographic position—straddling Europe and Asia—gives it a natural advantage for connecting flights between the two continents, a point OAG analysts have highlighted in previous reports.
For travellers, the shift means more one-stop options through Istanbul for routes that once required a change in London or Frankfurt. It also underscores the competitive pressure on European hubs to maintain their connectivity as airlines adjust schedules in response to geopolitical tensions and shifting demand.
Heathrow's drop is not just a matter of rankings. The airport has been working to recover its position, but capacity constraints and the Middle East situation remain hurdles. Meanwhile, other European airports are investing in infrastructure and rail links—such as Brussels Airport rejoining the high-speed rail network—to boost their appeal as seamless transfer points.
The OAG index also highlights the growing importance of Asian hubs: Kuala Lumpur International, Seoul Incheon, and Tokyo Haneda all feature in the top ten, reflecting the region's rapid aviation growth. For Europe, maintaining a competitive edge will require not just expanding route networks but also improving passenger experience—an area where European airports already lead globally.
As the aviation industry continues to evolve, the Megahubs Index serves as a reminder that connectivity is a moving target. Istanbul's rise may be the headline, but the broader story is one of shifting global aviation dynamics, with Europe's hubs adapting to stay relevant in an increasingly crowded field.
