Istanbul Airport Overtakes Heathrow as Europe’s Busiest Airport

Istanbul handled 8.15 million passengers in July against Heathrow’s 7.859 million — the first month the Turkish hub has topped the rankings since 2023. London’s answer: build the third runway.

Istanbul Airport overtook London Heathrow as Europe’s busiest airport in July, handling 8.15 million passengers to Heathrow’s 7.859 million, according to figures released this week by Turkish officials and the British hub.

It is the first month Istanbul has finished ahead of Heathrow since the London hub reclaimed Europe’s busiest-airport title in 2023, and the sharpest challenge yet to a run of dominance that stretched, with interruptions, back to the 1990s. Heathrow did not dispute the result and used it to press its expansion case.

“The case for expansion has never been clearer, as Heathrow was overtaken in July by Istanbul airport as the busiest hub in Europe,” the airport said in a traffic statement published Tuesday. “Our plans will ensure the country gets the infrastructure it needs to stay competitive and will deliver all-important economic growth.”

A gap of roughly 287,000 passengers

The margin was wide by the standards of a rivalry decided by a fraction of a percent in recent years. Istanbul finished the month about 287,000 passengers ahead on the exact totals.

Turkish Transport and Infrastructure Minister Abdulkadir Uraloğlu announced the July totals on Aug. 9. In the same statement, drawing on DHMI data, he put the figure precisely at 8,146,411 — 1.82 million domestic travelers and 6.33 million international. Aircraft movements totaled 50,748, split between 12,190 domestic and 38,558 international flights. News reports of the Turkish figures put Istanbul’s July traffic up 2.3% from a year earlier; the ministry’s own statement cited a 2.6% rise in national traffic for January through July.

Heathrow’s traffic fell. The west London airport recorded 7,859,000 terminal passengers in July, down 1.5% year over year. Cumulative traffic for January through July stood at 47.854 million, off 0.1%, while the rolling 12-month total reached 84.427 million, up 0.6%.

Both airports still set daily marks. Istanbul handled 289,732 passengers on Aug. 9, a figure Turkish authorities described as unprecedented on the continent. It surpassed the 289,260 the airport recorded on Aug. 1, a mark officials had described the same way.

Heathrow’s busiest day of 2026 so far came on July 19, when 267,000 passengers moved through the airport, driven largely by the school summer break.

Turkish officials claim a European record

Enes Çakmak, director general and board chairman of Turkey’s Directorate of State Airports Authority, known as DHMI, staked the claim on social media.

“We have reached the highest daily passenger number ever recorded to date in the aviation history of Türkiye and Europe,” Çakmak wrote.

In an earlier post marking an Aug. 1 record, Çakmak thanked staff for handling rising traffic safely and without interruption.

Uraloğlu has repeatedly framed Istanbul’s performance as evidence of Turkey’s rising standing in global aviation and the payoff from its infrastructure spending. Turkish airports handled roughly 138.8 million passengers nationwide from January through July, a total the minister has said exceeds the combined population of 18 European Union member states. Istanbul Airport alone accounted for about 48.07 million of that.

Why Heathrow’s numbers slipped

Heathrow’s decline was concentrated in one market. Passengers on Middle East routes fell 20.2% in July, to 621,000, a drop U.K. news outlets have tied to the ongoing U.S.-Iran conflict. Heathrow’s release reported the figure without giving a reason.

North America was also soft, down 3.0% at 2.005 million. Elsewhere, traffic held up or grew: Asia/Pacific rose 4.3% to 1.005 million, non-EU Europe gained 3.7%, EU traffic edged up 1.1% to 2.807 million and domestic U.K. traffic rose 1.7%. Africa and Latin America were essentially flat.

New entrants including ITA Airways, Alaska Airlines and Riyadh Air carried more than 136,000 passengers during the month. Cargo volumes climbed 2% year over year on South Asian and North American demand, and Heathrow logged its busiest freight day of 2026 on July 12, moving 5,000 metric tons (5,500 tons).

The airport also pointed to service metrics that have little to do with size: 98.5% of passengers waited less than five minutes at security, and Heathrow said it remained Europe’s most punctual hub. Italy and Spain ranked among the summer hot spots, with growth to Switzerland, Cyprus and the Czech Republic.

Two airports, two capacity stories

The divergence comes down largely to runway capacity.

Heathrow’s two runways operate at near-full capacity. Its owners are pursuing a third runway on a northwest alignment, up to 3,500 meters (about 11,500 feet), as part of a privately funded expansion that would lift annual capacity toward 150 million passengers and roughly 756,000 flights. Cost estimates in circulation start at £33 billion (about $43 billion) and rise depending on scope, including work on the M25 motorway.

The British government published a draft Heathrow Expansion National Policy Statement in June and opened a public consultation that runs until Sept. 1. A final planning decision is targeted for 2029. Rachel Reeves, who was chancellor at the time, said she wanted construction underway in the current parliament and the runway built by 2035. Transport Secretary Heidi Alexander, who launched the consultation and remains in the post under Prime Minister Andy Burnham, has publicly backed progress; Reeves did too before she was removed as chancellor in July. Opposition on noise, air quality and climate grounds remains active.

Heathrow CEO Thomas Woldbye made the airport’s case directly.

“We want to go further, growing our route network and passenger offering,” Woldbye said. “Expanding Heathrow will help ensure the UK remains home to Europe’s leading hub and continues to benefit from the trade, investment and tourism that increased connectivity will bring.”

Istanbul is already building. The airport, operated by IGA, has a design capacity of about 90 million passengers a year, with a fourth main runway under construction that IGA has said it aims to commission in the second half of the year, initially targeting the end of August. Parallel terminal work aims to support 120 million; operator comments have floated long-term master-plan potential as high as 200 million. The airport serves more than 330 destinations and about 116 scheduled airlines, and is the primary hub for Turkish Airlines. Pegasus also operates there.

What it means for U.S. travelers

For Americans, the shift marks a change in how European connections get built.

Istanbul’s geographic position and Turkish Airlines’ network make it a major connecting point between the Americas, Europe, Africa, the Middle East and Asia. Heathrow remains a primary transatlantic gateway — but one bumping against hard physical limits.

Background

Heathrow ranked as Europe’s busiest airport by passengers in most years from 1996 through 2019, according to ACI Europe data. It lost the title in 2020 during pandemic restrictions, regained it in 2023 and held it through 2025 — by roughly 40,000 to 44,000 passengers over Istanbul in full-year figures. Heathrow reported 84.46 million passengers for 2025, with ACI Europe listing 84.48 million; Istanbul came in around 84.44 million. Globally, Heathrow ranked about seventh in 2025 and Istanbul about eighth.

Istanbul Airport opened in October 2018 and became fully operational in April 2019, replacing the old Atatürk Airport.

Flight counts have told the story ahead of passenger counts. EUROCONTROL data during July periods showed Istanbul leading European airports by average daily flights — 1,623 in one mid-July week — ahead of Amsterdam, Paris Charles de Gaulle, Heathrow and Frankfurt. Movement leadership does not automatically translate into passenger leadership, given differences in aircraft size.

Heathrow’s July release also flagged new food and retail offerings, including Bill’s, Slim Chickens, a Wagamama kiosk and a Kids Eat Free program.