London Heathrow (LHR) has retained its title as the world’s most connected airport for the third consecutive year in 2025, offering over 59,000 possible connections to 226 destinations on the busiest day. Two Canadian airports made the annual top 50 ‘Megahubs’ list by global aviation data platform leader OAG: Toronto Pearson at 26, and Vancouver, 46.
Heathrow remains the leading hub for global travellers and is also Europe’s busiest airport by seat capacity, and notably, is the only airport in the Global Top 10 to retain the same ranking as last year. All other airports in the Top 10 have seen shifts in position – some positive and some negative.
OAG Megahubs is based on flight data from the 100 largest and 100 largest international airports, measured by total scheduled seats for the year. Rankings use data from the busiest day in global aviation between September 2024 and August 2025, which was Friday, Aug. 1, 2025.
Here are some ranking highlights:
- London Heathrow celebrates three consecutive years as the world’s top Megahub and was the most internationally connected airport in 2015, the year of Megahubs’ inaugural ranking. Over the past decade, the number of international destinations served at LHR has grown by 24%, underscoring its position as a leading hub for global travellers.
- While placing 26th globally, YYZ ranked regionally as North America’s No. 5 Megahub.
- Istanbul, where Turkish Airlines operate 79% of flights, surged from 8th to 2nd place year-on-year, thanks to a 25% increase in potential connections. Amsterdam Schiphol (AMS) rounds out an all-European top three, moving up one place.
- Kuala Lumpur takes joint fourth in the global list, highest ranked Asian airport and leader in low-cost connectivity. AirAsia accounts for 36% of flights at KUL. Sharing fourth is Frankfurt (FRA), climbing from 10th last year.
- In the US, Chicago O’Hare (ORD) is top international hub, while JFK drops from 6th to 14th in 2025. Atlanta Hartsfield-Jackson (ATL) is close behind ORD in 8th.
- Three Middle Eastern airports make the global top 50: Dubai International (DXB) ranks highest in 15th, with Riyadh (RUH) and Doha (DOH) also included. RUH rises 11 places year-on-year, overtaking DOH.
“Heathrow’s sustained dominance as a Megahub reflects its vital role in global travel, while Istanbul’s rapid rise up the ranks shows that hubs are evolving to meet demand,” says OAG Chief Analyst John Grant. “Our 2025 ranking underscores the balance between established gateways and ambitious challengers worldwide, which has developed over 10 years of OAG Megahubs.”
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