Busiest Airport in the World: Rankings, Flights, and Facts

World’s busiest airport (2025): Hartsfield-Jackson Atlanta (ATL) ·
2025 passengers: 106,302,208 (ACI World) ·
2024 passengers: 108 million (ACI World) ·
No. 2 in 2025: Dubai — 95,192,160 passengers (ACI World) ·
No. 1 by aircraft movements: Chicago O’Hare (ACI World)

What this means: the snapshot splits cleanly between what ACI World’s rankings confirm and what they don’t cover — and that split is the theme of the rest of this article.

Six facts, one pattern: Atlanta has held the passenger crown for more than two decades, and no other airport in the 2025 data comes within ten million passengers of it (ACI World).

What are the busiest airports in the world?

The short answer is Atlanta — if you count total passengers. The longer answer depends on which kind of “busy” you mean, and the metric you pick changes the winner.

How is “busiest” measured?

• Total passengers: the number of people enplaned and deplaned, with transit passengers counted once — the definition behind ACI World’s headline ranking (ACI World).
• Aircraft movements: takeoffs and landings, which measure operational volume rather than crowd size.
• International passengers: a separate ACI metric that was not part of the sources reviewed for this article.
• Physical size: land area or terminal footprint, which is a completely different title.

Because transit passengers are counted once, the passenger ranking rewards pure scale — the total number of people flowing through an airport, whether they start, end, or simply switch flights there. The movement ranking, by contrast, rewards operational intensity: how many aircraft the runways can absorb. Both are legitimate ways to define “the busiest airport in the world”; they just answer different questions.

Why is Atlanta the long-running No. 1?

• Atlanta handled 106,302,208 passengers in 2025 (ACI World).
• That total was 1.6% lower than its 2024 figure of roughly 108 million (ACI World).
• Atlanta was the only airport in ACI’s data to top 100 million passengers in 2024 (ACI World).
• Its 2025 total was still 3.8% below its pre-pandemic 2019 level (ACI World).

What this means: the passenger title is not a one-year accident. ACI data shows Atlanta absorbing volumes no other airport in the world has matched — and holding that position across more than two decades of rankings (ACI World).

Who compiles the official ranking?

• ACI World — Airports Council International, the global trade body for airports — publishes the annual passenger and movement rankings (ACI World).
• News outlets such as CNN Travel and AFAR republish the list and add context (CNN Travel, AFAR).
• The same ACI data also circulates through third-party reference sites, which is why different headlines can point to the same underlying numbers. For a closer look at how ranking metrics compete, see our earlier look at how airport rankings shift by metric.

The implication: whenever you see a “world’s busiest airport” headline, check which ACI metric it cites — passenger volume or aircraft movements. The headline is usually right about the ranking, and usually silent about the metric.

What are the top 10 airports in the world in 2026?

The honest answer: ACI World’s most recent update keeps Atlanta at No. 1, but the sources reviewed here do not include a complete 2026 top-ten table. The most complete ranking available is ACI’s 2025 list, and it is the data set used throughout this section (ACI World).

What does ACI World say about 2026?

• ACI World’s July 2026 update keeps Atlanta at No. 1 (ACI World).
• The same update highlights Asia-Pacific hubs climbing the rankings (ACI World).
• A full 2026 top-ten list is not included in the reviewed sources, so this article does not reconstruct one.

How should the 2026 list be read?

• Treat ACI’s 2025 numbers as the latest complete ranking; a full 2026 top ten is not yet available in the reviewed sources.
• Watch the gap between Atlanta and Dubai — 11.1 million passengers in 2025 — as the key number to track into 2026 (ACI World).
• Expect revised figures when ACI issues updates; the O’Hare discrepancy in the 2025 tables is a live example (ACI World).

Ten airports, one pattern: the United States still supplies four of the top ten, while Chinese hubs — Shanghai Pudong and Guangzhou Baiyun — are the fastest risers in the group.

* ACI World’s later 2025 traffic table revises O’Hare’s total to 84,856,018 passengers — a difference of 41,919 (ACI World).

Read the table closely and a second pattern appears: the race is tight below the top. From No. 4 Dallas/Fort Worth (85.7 million) to No. 10 Denver (82.4 million), the entire spread is only about 3.2 million passengers — less than one strong growth year for a major hub (ACI World).

What changed after the 2025 passenger totals?

• ACI’s revised table nudged Chicago O’Hare’s total upward by 41,919 passengers (ACI World).
• AFAR counted four U.S. airports in the 2025 global top ten: Atlanta, Dallas/Fort Worth, Chicago O’Hare, and Denver (AFAR).
• CNN Travel counted two Chinese airports — Shanghai Pudong and Guangzhou Baiyun — in the same list (CNN Travel).
• The gap between No. 1 Atlanta and No. 2 Dubai was about 11.1 million passengers in 2025.

The pattern: the passenger top ten looks stable at the top, but the gaps are narrowing — and that is exactly why the full 2026 ranking, when ACI World publishes it, will be worth watching.

What is the largest airport in the world in 2026?

“Largest” and “busiest” are two different titles, and they rarely belong to the same airport. “Largest” usually means physical area; “busiest” usually means passenger volume — and the two rankings answer different questions.

What is the largest airport on Earth?

• The sources reviewed for this article do not identify a 2026 largest airport by area.
• What they do show: Atlanta’s passenger title is about volume, not territory — airport area and passenger counts are separate metrics.
• When the sources don’t answer a question, the responsible move is to say so rather than guess.

If you are searching for the largest airport in the world, you will usually find candidates measured in square kilometers rather than passenger counts. But none of the sources reviewed for this article names a 2026 leader, so this article flags the gap instead of guessing.

What are the top 5 largest airports?

• No top-five list by land area appears in the reviewed sources.
• Rebuilding such a list from memory would create exactly the kind of unverified claim this article avoids.
• The reliable path: consult official airport fact sheets and civil aviation authority data for area figures.

How is airport size measured?

• Total land area: the full airport footprint, including runways, taxiways, terminals, and buffer land.
• Terminal floor area: the square footage of passenger buildings, often used in passenger-experience rankings.
• Runway infrastructure: count, length, and layout — a capacity measure, not a footprint measure.

Which airport has the most flights per day?

When the metric switches from passengers to flights, the winner changes. Flight-count rankings measure takeoffs and landings — what aviation calls aircraft movements — not the number of people on board.

How do daily flight counts rank?

• ACI World’s movement ranking counts takeoffs and landings for the year (ACI World).
• An airport can register fewer passengers per flight — more regional jets, more short hops — and still log more total movements.
• The specific daily flight count for any airport was not supplied in the sources reviewed for this article.

A movement is anything that takes off or lands: a full wide-body jet counts the same as a regional turboprop. That is why passenger volume and movement volume can diverge so sharply.

Which airport leads in flight movements?

“Chicago O’Hare ranked first worldwide for aircraft movements in the 2025 ACI rankings.”

ACI World (global airports trade body)

So the ranking splits in two: Atlanta leads by passenger volume, and Chicago O’Hare leads by aircraft movements. Both airports can claim the “world’s busiest” title — under different definitions.

Why does flight volume matter?

• Movements drive runway and air-traffic capacity — the operational strain an airport absorbs.
• For cargo operators and airlines, movement counts often matter more than passenger totals for scheduling.
• For travelers, high movement volume usually translates into more crowded skies and tighter slot coordination.

The catch: “busiest by flights” and “busiest by passengers” can name two different airports in the same year — and both statements can be true.

Which airport has the most runways?

Runway count is an infrastructure metric, not a traffic metric — and it does not appear in ACI World’s passenger or movement rankings.

What is the runway count for major hubs?

• The sources reviewed for this article include no runway-count figure for any airport.
• Official sources — airport operators and national aviation authorities such as the U.S. Federal Aviation Administration — publish runway inventories, but none of those pages were among the provided sources.
• Rather than guess a number, this article treats runway count as a capacity question, not a ranking answer.

If you need a hard runway count, the reliable move is to check the airport’s official fact sheet or its national aviation authority. The U.S. Federal Aviation Administration publishes runway and operations data for American airports; none of those documents were part of the sources reviewed for this article, so no count is repeated here.

How does runway capacity affect airport rankings?

• Runway capacity constrains how many takeoffs and landings an airport can process per hour.
• That constraint shapes which airports can even compete for the aircraft-movement title.
• Passenger volume can still be high at airports with limited runway capacity, because bigger aircraft carry more people per movement.

Where can official runway data be found?

• Airport operators publish runway counts in official fact sheets and airport master plans.
• National regulators, such as the FAA in the U.S., maintain aeronautical data on runway dimensions and operations.
• ACI World’s rankings focus on traffic results rather than runway inventory, so runway data sits outside the ranking system.

The pattern: runway count says what an airport could handle; passenger and movement totals say what it actually handled. For ranking questions, the second is the relevant one.

What is the most stressful airport in the USA?

Like the largest-airport and runways questions, this one has no supported answer in the reviewed sources. None of the top search results examined here cites a published study ranking U.S. airports by stress — so the honest answer is to say so, then explain what actually supports such a ranking.

What makes an airport stressful?

• Crowding: the experience of moving through a facility processing more than 100 million people a year, as Atlanta does (ACI World).
• Transfer complexity: the distance and time between connecting flights.
• Disruptions: delays and cancellations that add uncertainty to the traveler experience.

How does Atlanta’s constant activity affect travelers?

• Atlanta’s 106.3 million annual passengers make it the busiest passenger airport in the world (ACI World).
• That volume guarantees crowds — a structural feature of the airport, not an occasional problem.
• But a stress ranking needs traveler-survey or performance data, which the reviewed sources do not provide.

Which US airports have been ranked most stressful in published studies?

• No published stress ranking appeared in the sources reviewed for this article.
• Any credible “most stressful airport” claim must cite a named study or survey — none was provided here.
• So this article deliberately does not name a “most stressful” U.S. airport.

The trade-off: readers want a definitive stress list, and the available sources do not support one. Publishing a made-up ranking is worse than saying the data is missing.

Timeline signal

• 2000–2024: Atlanta has ranked as the world’s busiest airport by passengers every year since 2000 (ACI World).
• 2024: Atlanta served roughly 108 million passengers — the only airport above the 100 million mark (ACI World).
• 2025: Atlanta handled 106,302,208 passengers to keep the No. 1 title (ACI World).
• April 2026: ACI World’s 2025 rankings put Chicago O’Hare first in aircraft movements (ACI World).
• July 2026: ACI World’s update keeps Atlanta at No. 1 and revises O’Hare’s 2025 passenger total to 84,856,018 (ACI World).

What this means: the passenger crown has been stable for a generation, but the movement crown can sit elsewhere — and the revised figures are a reminder that even official rankings get updated.

What we know — and what we don’t

The balance is deliberate: the passenger ranking is solid and well-sourced, while several popular “world’s busiest airport” sub-questions — largest, most runways, most stressful — have no supported answer in the data this article could verify.

What the sources say

Three statements from the ranking’s publishers and reporters are worth repeating.

The passenger ranking uses total passengers enplaned and deplaned, with passengers in transit counted once.

ACI World (the airports’ global trade body)

Four U.S. airports appeared in ACI’s 2025 global passenger top ten: Atlanta, Dallas/Fort Worth, Chicago O’Hare, and Denver.

AFAR (the travel magazine)

Shanghai Pudong International Airport ranked fifth globally in 2025, with approximately 85.0 million passengers.

CNN Travel (the news outlet’s travel section)

The takeaway: the sources agree on the numbers but differ in emphasis — which is exactly why the metric behind every “world’s busiest airport” headline deserves a second look.

The takeaway

The answer to “which airport is the busiest in the world” is only clear once someone defines the metric. ACI World’s passenger ranking gives the crown to Atlanta; its movement ranking gives it to Chicago O’Hare; and the fastest-closing contenders — Dubai, Shanghai Pudong, and Guangzhou Baiyun — are narrowing the gap from behind. For anyone planning travel, cargo routes, or airport capacity in the next few years, the choice is clear: follow ACI World’s passenger and movement rankings side by side, or risk betting on a single “world’s busiest” headline that tells half the story.

Related reading

• Busiest Airport in the World: Rankings, Metrics & Future
• Busiest Airport in World: 2024 Rankings by Flights, Passengers

Both pieces dig deeper into how airport rankings change when the metric — passengers, flights, or future projections — shifts.

Frequently asked questions

The FAQ answers stick to the ACI World data and flag questions the sources do not answer.