Heathrow has lost its position as Europe’s busiest airport to Istanbul Airport, after passenger numbers at the west London hub fell behind its Turkish rival in July.
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Heathrow has lost its position as Europe’s busiest airport to Istanbul Airport, after passenger numbers at the west London hub fell behind its Turkish rival in July.
According to figures reported by the BBC, Heathrow handled 7.86 million passengers across its four terminals in July. Istanbul Airport recorded 8.15 million passengers during the same month, putting it around 290,000 passengers ahead.
The shift comes as Heathrow faces weaker traffic on routes to the Middle East. The airport said passenger traffic on Middle East routes fell 20.2% year on year in July, amid the ongoing conflict involving the US, Israel and Iran.
The latest monthly figures put Heathrow’s long-held position under pressure at a time when the airport is also seeking approval for a major expansion.
Heathrow has historically ranked among Europe’s busiest airports.
Annual figures from Airports Council International show it held the top position from 1996 until 2019. The coronavirus pandemic disrupted global aviation and ended that run in 2020.
Heathrow regained the European lead in 2023 and retained it in the following years before Istanbul moved ahead in July.
The July comparison was:
The monthly result does not by itself determine the annual ranking. Airports Council International's annual figures are based on passenger traffic over the full year.
Heathrow said the conflict involving the US, Israel and Iran affected passenger traffic during July, particularly on routes serving the Middle East.
The airport recorded a 20.2% year-on-year decline in Middle East route traffic for the month.
Heathrow has also acknowledged ongoing disruption linked to airspace closures in the region. The airport has advised passengers to check with their airlines for the latest flight information.
The effect on Heathrow comes during the important summer travel period, when passenger volumes typically rise as holiday travel increases.
Despite the weaker monthly comparison, Heathrow said 19 July was its busiest day of the year so far, with 267,000 passengers passing through the airport as schools across the UK began their summer break.
The latest passenger figures come as Heathrow continues to make the case for a third runway.
The airport currently operates two runways and says they are running close to full capacity. Its expansion proposal would increase the airport’s potential capacity to 150 million passengers a year.
Heathrow has said the case for expansion has become stronger, citing the need for additional infrastructure and improved connectivity.
The airport's owners have proposed a major expansion programme centred on a third runway. Heathrow has previously submitted its proposals to the UK government as part of the planning process.
According to Heathrow’s published plans, the wider expansion would involve additional terminal capacity and upgrades to supporting infrastructure alongside the proposed runway.
The loss of the monthly European lead does not indicate a collapse in demand at Heathrow.
The airport handled 84.46 million passengers in 2025, according to figures cited by the BBC.
Heathrow also said several new airlines began operating at the airport in July. It presented the new services as evidence of continued demand for access to the London hub.
The airport’s investor figures show it handled 40 million passengers in the first half of 2026, broadly in line with the same period a year earlier.
Heathrow's current operating constraints remain central to the expansion debate. With two runways operating close to capacity, additional growth depends partly on how efficiently existing infrastructure can be used and on future expansion.
Heathrow’s expansion plans remain subject to the UK government's planning and regulatory processes.
The airport submitted its third-runway proposal to the government in 2025. Heathrow has said the proposed expansion could ultimately raise annual passenger capacity to 150 million.
The airport is also seeking to recover early expenditure connected with the runway project. The UK Civil Aviation Authority has allowed Heathrow to recover certain efficiently incurred early costs associated with capacity expansion, subject to regulatory conditions.
For Heathrow, the July figures add another data point to the wider debate over airport capacity in the UK.
Istanbul’s higher passenger count in July shows how quickly the European airport rankings can shift when traffic patterns change. Heathrow’s immediate challenge is managing continued disruption on Middle East routes while maintaining demand across its wider international network.
The longer-term question is whether the airport can secure the infrastructure expansion it says is needed to accommodate future growth.
The July figures do not establish a permanent change in Europe’s airport rankings. Istanbul's lead was recorded over a single month, while annual rankings depend on passenger numbers accumulated across the year.
For Heathrow, however, the result highlights the pressure created by geopolitical disruption and the limits of its current two-runway operation.
The airport will continue to monitor passenger demand and route performance while its third-runway proposal moves through the government process.
The next set of traffic figures will show whether Istanbul's July lead was temporary or part of a broader shift in Europe's competitive airport landscape.
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