Istanbul Airport has overtaken London Heathrow to become the world’s most connected airport in the 2026 Megahubs Index. The Turkish hub leads a global ranking in which European airports occupy five of the top 10 positions, underlining the region’s continuing importance to international air travel.
The rankings, published by aviation analytics company OAG, measure the number of possible connections between arriving and departing flights within a six-hour period on an airport’s busiest day. They also take into account the number of destinations served.
Istanbul Airport takes the top position
Istanbul Airport ranked first in the 2026 index, with possible connections to 337 destinations worldwide. Its position reflects Türkiye’s geographical location between Europe, Asia and the Middle East, as well as the airport’s extensive airline network.
The airport was assessed using flight schedules for Sunday 2 August, identified as the busiest day in this year’s comparison. Istanbul’s connectivity placed it ahead of London Heathrow, which had held the top position in the previous ranking.
Istanbul Airport is also described as the world’s eighth-busiest airport by capacity. Its rise to the top of the connectivity table highlights the difference between total passenger capacity and the number of practical transfer opportunities available to travellers.
London Heathrow falls to second place
London Heathrow moved down one position after its potential connections fell by 6 per cent compared with its busiest day in the previous year.
OAG linked the decline partly to disruption affecting Middle East flight schedules. Capacity between Heathrow and the region was down by 25 per cent in August, according to the index’s analysis.
The result does not mean Heathrow has lost its importance as an international gateway. The airport remains one of the world’s leading hubs, but changes to route schedules and regional capacity affected its performance in this year’s connectivity comparison.
Five European airports feature in the global top 10
Europe has a strong presence among the highest-ranked aviation hubs. Alongside Istanbul and Heathrow, three other European airports appear in the top 10:
- Amsterdam Airport Schiphol, Netherlands: third place
- Frankfurt International Airport, Germany: seventh place
- Paris Charles de Gaulle Airport, France: ninth place
The remaining airports in the global top 10 are Kuala Lumpur International Airport, Chicago O’Hare International Airport, Seoul Incheon International Airport, Tokyo Haneda and Atlanta Hartsfield-Jackson International Airport.
Twelve of the world’s top 50 hubs are in Europe
The wider ranking shows that Europe remains highly represented among the world’s most connected airports. Twelve of the top 50 hubs are located in Europe.
In addition to the airports in the top 10, the European entries include:
- Madrid Adolfo Suárez-Barajas, Spain — 18th
- Istanbul Sabiha Gökçen, Türkiye — 21st
- Athens International Airport, Greece — 22nd
- Munich Airport, Germany — 23rd
- Rome Fiumicino, Italy — 27th
- Barcelona-El Prat, Spain — 41st
- Zurich Airport, Switzerland — 45th
The spread of airports across major European cities demonstrates the depth of the continent’s air-transport network. It also reflects the role of European hubs in connecting domestic, regional and long-haul routes.
What the ranking means for travellers
Airport connectivity is particularly relevant to passengers making international journeys with a transfer. A highly connected hub can offer more combinations of departure and arrival times, potentially making it easier to reach destinations that do not have a direct service.
However, a high position in the index does not guarantee the cheapest fares, the shortest journey or the most reliable connection. Passenger experience can also depend on:
- airline schedules and codeshare agreements;
- minimum connection times;
- terminal layouts and transfer procedures;
- seasonal route changes;
- border, visa and security requirements; and
- weather or geopolitical disruption.
The ranking is therefore best understood as a measure of network opportunity rather than a complete assessment of airport quality.
Why European hubs remain important
European airports benefit from dense short-haul networks, established airline operations and strong links between major business and tourism markets. Airports such as Amsterdam, Frankfurt and Paris serve as transfer points between Europe and destinations across North America, Asia, Africa and the Middle East.
Istanbul occupies a distinctive position because its network bridges several regions. The airport’s leading result also shows how changes in route availability can reshape the global aviation hierarchy from one year to the next.
For passengers in Ireland and elsewhere in Europe, the ranking may be relevant when comparing connecting routes for long-distance travel. It does not, by itself, change passenger rights, visa rules or airline obligations. Those remain governed by the relevant national, international and European regulations.
Conclusion
The 2026 Megahubs Index places Istanbul Airport at the centre of global aviation connectivity, ahead of London Heathrow and other major international gateways. With five European airports in the top 10 and 12 in the top 50, the results also underline the continuing importance of Europe’s air network to worldwide travel.
