Heathrow has dominated Europe’s airport rankings for decades. Now another major hub has passed it, as the two airports battle for the top spot.
London Heathrow has been THE airport in Europe for a very, very long time.
Not necessarily the best. Not necessarily everyone’s favorite. But in terms of sheer passenger numbers? Heathrow has traditionally been the big dog.
Figures released annually by Airports Council International show that Heathrow was Europe’s busiest airport every year from 1996 through 2019.
Then COVID happened.
Heathrow lost its top spot in 2020, when travel restrictions sent aviation into a tailspin. But as travel recovered, so did Heathrow. It regained the title of Europe’s busiest airport in 2023 and held onto it through 2025.
But another airport has been creeping up behind it.
And in July, it finally passed Heathrow.
Istanbul Has Been Getting Closer And Closer
Istanbul Airport finished 2025 just about 40,000 passengers behind Heathrow. It then started 2026 in front, handling 6.9 million passengers in January compared with Heathrow’s 6.5 million, according to Airports Council International Europe.
Heathrow managed to regain its lead as the year progressed, but barely.
In May, just 3,012 passengers separated the two airports.
That’s kind of ridiculous when we’re talking about airports that each handle millions of people every month.
By the end of June, Heathrow had handled 40 million passengers during the first half of the year, compared with 39.84 million at Istanbul.
So yeah, this had turned into a VERY close race.
And then came July.
Istanbul Airport Handles More Than 8.1 Million Passengers In July
Turkey’s Ministry of Transport and Infrastructure reported that Istanbul Airport handled 8,146,411 passengers in July.
Of those, 1,816,429 were domestic passengers, while 6,329,982 traveled on international routes.
Heathrow, meanwhile, recorded about 7.86 million passengers for the month.
That put Istanbul ahead by nearly 290,000 passengers and gave it the monthly crown as Europe’s busiest airport.
The change comes as passenger growth across Europe has been slowing. Passenger traffic increased 2.6% during the first half of 2026, according to ACI Europe. Growth slowed from 4.3% during the first quarter to just 1.3% in the second.
And apparently world events aren’t helping.
“There is no escaping the fact that geopolitics have increasingly been shaping traffic performance this year,” said ACI Europe Director General Olivier Jankovec.
Heathrow Is Running Out Of Room
Here’s where things get even more interesting.
Heathrow says its two runways are operating at 99% of capacity.
In other words, there isn’t exactly a whole lot of wiggle room left.
The airport continues to pursue its long-discussed third runway, along with expanded terminal facilities. Heathrow says the project could eventually increase the airport’s capacity to as many as 150 million passengers per year.
But Heathrow’s third runway is still just a proposal.
Istanbul, meanwhile, is much closer to getting another one.
Turkey’s Ministry of Transport and Infrastructure says construction of Istanbul Airport’s fourth main runway is nearing completion, with operations expected to begin during the final quarter of 2026 following technical testing.
So while Heathrow is trying to figure out how to accommodate substantially more passengers in the future, Istanbul is already getting ready to add more capacity.
So Is Heathrow No Longer Europe’s Busiest Airport?
Well, at least for July, yup.
And considering how close the two airports have been throughout 2026, I wouldn’t necessarily engrave Istanbul’s name on a permanent trophy just yet. One month’s passenger numbers don’t tell us who will ultimately finish the year on top.
But the bigger story may be what’s happening behind those numbers.
Heathrow has spent decades at or near the top while operating with just two runways, and it’s now bumping up against the limits of what those runways can handle. Istanbul, meanwhile, is still expanding.
So whether Istanbul ultimately finishes 2026 as Europe’s busiest airport or Heathrow manages to claw its way back ahead, one thing seems pretty clear: Heathrow’s longtime grip on the title isn’t nearly as secure as it used to be.
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