Istanbul Airport has overtaken London Heathrow as Europe’s busiest airport by passenger numbers, a symbolic shift that highlights the growing importance of Turkey’s aviation hub and the capacity constraints facing its British rival.
Istanbul handled approximately 8.15 million passengers in July 2026, compared with 7.86 million at Heathrow. Traffic at the Turkish airport increased 2.3% from a year earlier, while Heathrow recorded a 1.5% decline.
For Heathrow, the reversal is particularly notable because the London airport dominated European passenger rankings for decades. It was Europe’s busiest airport from 1996 through 2019, lost the position during the pandemic and returned to the top in 2023.
July was not an entirely weak month for Heathrow. July 19 became its busiest day of 2026 so far, with approximately 267,000 passengers passing through the terminals. New airlines including ITA Airways, Alaska Airlines and Riyadh Air also began serving the airport.
However, Middle East traffic fell sharply amid the conflict involving Iran. Passenger numbers on Heathrow’s Middle Eastern routes were down 20.2% year over year in July, contributing to the overall decline.
Istanbul Has Something Heathrow Does Not – Space
The two airports face fundamentally different physical constraints.
Heathrow operates two runways near densely populated areas of west London and says they are already running close to full capacity. Istanbul Airport, by contrast, opened in 2018 on a vast new site outside the city and was designed from the beginning for large-scale expansion.
Istanbul can operate around the clock and already uses three independent runways simultaneously. A fourth runway is expected to become operational by the end of 2026, creating additional capacity for airlines and passengers.
Its geographic position is another advantage. Istanbul sits between Europe, Asia, the Middle East and Africa, giving airlines access to major connecting flows that increasingly define global aviation.
Airport CEO Selahattin Bilgen said overtaking Heathrow represented a significant milestone and pointed to Istanbul’s runway capacity and operational flexibility as key reasons for its growth.
Heathrow Says the Answer Is a £33 Billion Expansion
Heathrow is using the new ranking to strengthen its case for a third runway.
Its proposed £33 billion expansion could eventually increase annual capacity to around 150 million passengers, compared with the 84.46 million travelers the airport handled in 2025.
The project remains politically contentious, but Heathrow argues that additional capacity is necessary if the United Kingdom wants to maintain a leading international hub capable of competing with rapidly expanding airports elsewhere.
Chief Executive Thomas Woldbye said expansion would allow Heathrow to grow its route network while supporting trade, tourism and investment.
The comparison with Istanbul illustrates the challenge. While Heathrow continues debating how to add a runway within one of Europe’s most densely developed metropolitan areas, Istanbul was built with expansion already embedded in its design.
London’s other major airports are growing too. Stansted recorded a record 3.1 million passengers in July, up 6.3%, while Manchester Airport also posted a record month with 3.4 million travelers.
But the headline belongs to Istanbul. For the first time in Heathrow’s latest period at the top, Europe’s busiest airport is no longer in London – and the gap could become harder to close as Istanbul keeps adding capacity.
Disclaimer: TravelCapybara is an independent media brand owned and operated by NuvexMedia LLC, publishing travel news, destination guides, research, and insights. NuvexMedia LLC may invest in or collaborate with companies across the travel, hospitality, technology, and digital media sectors. These relationships do not influence TravelCapybara’s editorial coverage. While we strive for accuracy, travel requirements, prices, schedules, availability, and local conditions may change without notice. Readers should independently verify information before making travel or purchasing decisions. This content is for informational purposes only and does not constitute professional advice. © 2026 NuvexMedia LLC. All rights reserved.
