Busiest Airports: Statistics on Passenger Traffic Trends
Atlanta has topped the global passenger rankings every year for more than two decades, with 2020 the only exception. In 2025 it handled 106.3 million passengers, but the chasing pack is closing in, led by Dubai, Tokyo Haneda and a fast-rising Shanghai Pudong.
Why this matters: airport rankings show where the world actually flies, which hubs are winning transfer traffic, and where congestion is most likely to turn into delays and missed connections. They also reveal how unevenly the post-pandemic recovery has played out, with some giant airports far above 2019 and others still well below it.
Key Busiest Airports Statistics at a Glance
- The world's airports handled a record 9.8 billion passengers in 2025, up 3.7% on 2024.
Source: ACI World, final 2025 airport rankings, 2026 - Atlanta Hartsfield-Jackson handled 106.3 million passengers, keeping its place as the world's busiest airport despite a 1.6% dip.
Source: ACI World, final 2025 airport rankings, 2026 - Dubai ranked second with 95.2 million passengers, every one of them international.
Source: ACI World, final 2025 airport rankings, 2026 - Tokyo Haneda climbed to third place with 91.7 million passengers, a 6.7% rise.
Source: ACI World, final 2025 airport rankings, 2026 - The 20 busiest airports served 1.59 billion passengers, about 16% of all traffic worldwide.
Source: ACI World, final 2025 airport rankings, 2026 - Istanbul Airport is 61.8% busier than in 2019, the largest gain in the global top 20.
Source: ACI World, final 2025 airport rankings, 2026 - Beijing Capital remains 29.3% below its 2019 traffic, the deepest shortfall in the top 20.
Source: ACI World, final 2025 airport rankings, 2026 - International passengers reached 4.0 billion in 2025, up 5.9% year on year.
Source: ACI World, preliminary 2025 airport rankings, 2026 - Chicago O'Hare logged 857,392 aircraft movements, the most of any airport and 10.5% more than in 2024.
Source: ACI World, final 2025 airport rankings, 2026 - Europe's airports welcomed a record 2.6 billion passengers in 2025, up 4.4%.
Source: ACI EUROPE, Full Year 2025 Airport Traffic Report, 2026 - London Heathrow beat Istanbul by fewer than 45,000 passengers for the title of Europe's busiest airport.
Source: ACI World, final 2025 airport rankings, 2026 - Atlanta recorded 51.5 million passenger boardings, the most of any US airport.
Source: FAA, Preliminary CY2025 Enplanements, 2026 - Jeju to Seoul Gimpo was the world's busiest route with 14.4 million seats scheduled in 2025.
Source: OAG, Busiest Flight Routes 2025, 2025 - Hong Kong to Taipei was the busiest international route with 6.8 million seats.
Source: OAG, Busiest Flight Routes 2025, 2025 - Dubai handled 31.5 million passengers in the first half of 2026, down 31.3%, after regional airspace closures.
Source: Dubai Airports H1 2026 traffic update, 2026 - Global airport traffic is forecast to reach 10.2 billion passengers in 2026 and 18.8 billion by 2045.
Source: ACI World, World Airport Traffic Forecasts 2025-2054, 2026 (F = forecast)
How airports count passengers: ACI World counts every passenger who arrives at or departs from an airport, with transit passengers counted once. A single return trip from Atlanta to London therefore adds two passengers to each airport. That is why the world's airports reported 9.8 billion passengers in 2025, while IATA estimates airlines carried about 5.0 billion. Airport totals and airline passenger totals measure different things and should never be compared directly. US FAA figures count boardings (enplanements) only, which is why Atlanta shows 51.5 million on the FAA list.
The World's 20 Busiest Airports in 2025
ACI World's final 2025 rankings, published on 15 July 2026, cover 2,817 airports in more than 180 countries. The top of the table is crowded: positions four to ten are separated by only about 3.3 million passengers, so a single strong year can move an airport several places.
Source: ACI World, World's Busiest Airports: Atlanta Holds, Asia Climbs, final 2025 rankings, 15 July 2026.
Atlanta leads with 106.3 million passengers, roughly 291,000 people a day, followed by Dubai at 95.2 million and Tokyo Haneda at 91.7 million. Shanghai Pudong made the biggest jump in the top 10, rising from 10th to 5th on 10.7% growth, while Kuala Lumpur was the biggest mover in the top 20, climbing six places to 20th. Five US airports make the list, and ACI notes that four of them are mainly domestic hubs where 80% to 95% of traffic never leaves the country. Together, the top 10 airports account for about 9% of global passenger traffic.
Which Busy Airports Have Grown Most Since 2019
Comparing 2025 with 2019 strips out the pandemic years and shows which hubs have genuinely gained ground. The spread is striking, from a 61.8% gain to a 29.3% loss among airports of similar size.
Source: ACI World, final 2025 rankings (percentage change vs 2019), 15 July 2026.
Istanbul (+61.8%) tops the list, partly because Istanbul Airport only took over from Ataturk as the city's main hub in April 2019, so its 2019 base covers part of a year. Shenzhen (+25.6%) and Denver (+19.4%) show organic growth. At the other end, Beijing Capital (-29.3%) has lost traffic to the newer Beijing Daxing airport, and Los Angeles (-16.3%) is still well short of its pre-pandemic volume. Atlanta itself remains 3.8% below 2019, which shows how much of its lead rests on scale built before 2020.
Global Airport Passenger Traffic, 2019 to 2026
The rankings sit on top of a market that collapsed in 2020 and took until 2024 to recover. ACI World puts 2019 traffic at 9.2 billion passengers; the pandemic erased more than 5.6 billion of those in 2020.
Source: ACI World press releases of 9 November 2021 (2019 total, 2020 loss), 19 July 2023 (2022), 16 July 2024 (2023), 8 July 2025 (2024) and 15 July 2026 (2025); ACI World, World Airport Traffic Forecasts 2025-2054, 28 January 2026 (2026F). 2020 and 2021 derived from ACI loss and growth figures. F = forecast.
Traffic fell to roughly 3.6 billion in 2020, recovered to 8.7 billion in 2023 and passed its 2019 level in 2024. The 2025 total of 9.8 billion is 6.5% above 2019. During the 2020 slump, Guangzhou briefly overtook Atlanta as the world's busiest airport with 43.8 million passengers against 42.9 million, the only interruption to Atlanta's long run at the top. ACI's January 2026 forecast of 10.2 billion passengers for 2026 was made before the Middle East airspace disruption covered in the Outlook section below.
Busiest Airports for International Passengers
Strip out domestic flights and the ranking changes completely. No US airport appears in the international top 10; instead, the list is dominated by transfer hubs in the Gulf, Asia and Western Europe.
Source: ACI World, Busiest airports in the world (international passenger traffic, final 2025 data), accessed September 2026.
Dubai handled 95.2 million international passengers, ahead of London Heathrow (79.9 million) and Seoul Incheon (73.6 million). Hong Kong posted the fastest growth in the group at 14.9%, though it remains 14.7% below 2019. Globally, international traffic reached 4.0 billion passengers in 2025, about 41% of all airport passengers. The table shows how much of each hub's total traffic crosses a border.
| Airport | Total 2025 | Int'l 2025 | Int'l share |
|---|---|---|---|
| Dubai (DXB) | 95.2M | 95.2M | 100% |
| Amsterdam (AMS) | 68.8M | 68.8M | 100% |
| Seoul Incheon (ICN) | 74.1M | 73.6M | 99.2% |
| Singapore Changi (SIN) | 70.0M | 69.4M | 99.2% |
| London Heathrow (LHR) | 84.5M | 79.9M | 94.5% |
| Paris CDG (CDG) | 72.0M | 66.1M | 91.8% |
| Istanbul (IST) | 84.4M | 66.6M | 78.9% |
Singapore has no domestic flights, so its small gap reflects how ACI's total and international series are compiled, not domestic travel. Istanbul is the outlier among the big European hubs: about 17.8 million of its passengers flew domestically, which is what lifts its overall total level with Heathrow while it trails on international traffic.
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Busiest Airports by Aircraft Movements
An aircraft movement is one take-off or one landing. Ranking airports by movements rather than passengers favours hubs with many smaller regional jets, which is why the movements table is heavily American.
Source: ACI World, final 2025 rankings (aircraft movements and passengers), 15 July 2026. Airports shown appear in both the top 20 for passengers and the top 20 for movements.
Chicago O'Hare recorded 857,392 movements, ahead of Atlanta (807,625) and Dallas/Fort Worth (743,394); seven of the top 10 for movements are in the US. Dividing passengers by movements gives a rough average load per flight: O'Hare handles about 99 passengers per movement, while Tokyo Haneda handles about 187 and London Heathrow about 176. Slot-constrained airports such as Heathrow squeeze more people through each runway slot by using bigger aircraft, which also leaves them little slack when weather or staffing problems strike. Delay risk at these hubs tends to peak in summer, as our analysis of peak travel seasons and flight delays shows.
Europe's Busiest Airports: 2025 vs 2019
ACI EUROPE reports that the continent's airports welcomed a record 2.6 billion passengers in 2025, up 4.4% and an extra 100 million travellers on 2024. At the top, London and Istanbul finished almost level.
Source: ACI World, final 2025 rankings, 15 July 2026 (2025 totals and % change vs 2019; 2019 values derived); ACI EUROPE, Full Year 2025 Airport Traffic Report, 5 February 2026.
Heathrow (84.5 million) kept first place by fewer than 45,000 passengers over Istanbul (84.4 million), which has added about 32 million passengers since 2019. Paris CDG (-5.4%) and Amsterdam (-4.1%) are still below 2019, while Madrid (+10.4%) has overtaken its pre-pandemic peak. Among airports with more than 40 million passengers, ACI EUROPE lists Istanbul Sabiha Gokcen (+16.7%) as the fastest grower in 2025. For how that traffic translates into disruption, see our global flight disruption statistics.
Busiest US Airports by Passenger Boardings
The FAA ranks US airports by enplanements, meaning passengers boarding a flight. Because arrivals are excluded, the figures are roughly half of the ACI totals for the same airports. Our dedicated US airports statistics page covers the domestic picture in more depth.
Source: FAA, Preliminary CY2025 Enplanements at All Commercial Service Airports (by Rank), 8 July 2026. Preliminary data.
Atlanta led with 51.5 million boardings (-2.0%), followed by Dallas/Fort Worth (41.3 million) and Chicago O'Hare (40.7 million). O'Hare (+5.5%) and San Francisco (+4.7%) were the only top-10 airports to grow meaningfully, while Las Vegas fell 6.1%. Combined, the top 10 US airports boarded 347.9 million passengers, 0.7% fewer than in 2024. Daily security screening volumes tell a similar story in our TSA checkpoint travel numbers.
The World's Busiest Flight Routes
OAG ranks routes by scheduled airline seats across both directions over the full calendar year. The busiest routes are short, high-frequency domestic shuttles, mostly in Asia.
Source: OAG, Busiest Flight Routes in the World 2025, published 22 December 2025. Seats scheduled January-December 2025, both directions.
Jeju to Seoul Gimpo carried 14.4 million scheduled seats, ahead of Sapporo to Tokyo Haneda (12.1 million) and Fukuoka to Tokyo Haneda (11.5 million). Nine of OAG's overall top 10 routes are in Asia-Pacific. On international routes, Hong Kong to Taipei (6.8 million seats) leads, and New York JFK to London Heathrow is the only long-haul route in the international top eight with 4.0 million seats. Europe's busiest domestic route, Barcelona to Palma, schedules about 3.0 million seats.
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Outlook
ACI World expects passenger traffic to double to 18.8 billion by 2045, with growth concentrated in emerging markets and increasingly held back by runway, terminal and aircraft delivery constraints. The near term looks less certain. IATA's June 2026 outlook cut airline passenger growth for 2026 to 2.4% after a near-complete shutdown of Gulf airspace at the start of the Middle East conflict, and Dubai International handled 31.5 million passengers in the first half of 2026, down 31.3%. To match Heathrow's 2025 international total of 79.9 million, Dubai would need about 48.4 million passengers in the second half, so the ranking for international traffic could change hands in 2026.
References and Sources
- ACI World, World's Busiest Airports: Atlanta Holds, Asia Climbs (final 2025 rankings), 15 July 2026
- ACI World, World's Busiest Airports Revealed in Latest Global Rankings (preliminary 2025 data), 14 April 2026
- ACI World, Busiest airports in the world (international passenger rankings, final 2025 data), accessed 24 September 2026
- ACI World, World Airport Traffic Forecasts 2025-2054, 28 January 2026
- ACI World, World's Busiest Airports Revealed in Final Global Rankings (2024 data), 8 July 2025
- ACI World, Top 20 Busiest Airports in the World Confirmed by ACI World (2023 data), 16 July 2024
- ACI World, ACI World Confirms Top 20 Busiest Airports Worldwide (2022 data), 19 July 2023
- ACI World, ACI's World Airport Traffic Report Reveals Domestic Traffic Leading Recovery, 9 November 2021
- ACI World, ACI World Data Reveals COVID-19's Impact on World's Busiest Airports (2020 data), 22 April 2021
- ACI EUROPE, Full Year 2025 Airport Traffic Report, 5 February 2026
- Federal Aviation Administration, Preliminary CY2025 Enplanements at All Commercial Service Airports (by Rank), 8 July 2026
- OAG, Busiest Flight Routes in the World 2025, 22 December 2025
- IATA, Middle East Disruptions and High Fuel Prices Halve Airline Industry Profitability, 7 June 2026
- Dubai Airports via Emirates News Agency (WAM), DXB Welcomes 31.5 Million Guests During H1 2026, August 2026
Methodology Note
Airport rankings use ACI World's final 2025 data released on 15 July 2026, which supersedes the preliminary figures of 14 April 2026; the preliminary release is used only for the global international passenger total (4.0 billion), which the final release did not restate. ACI counts arriving plus departing passengers with transit passengers counted once, so airport totals roughly double airline passenger counts (IATA: about 5.0 billion in 2025) and should not be compared with them. FAA enplanements count boardings only and are preliminary. Values of 2019 for European airports were derived by dividing 2025 totals by ACI's stated change versus 2019; 2020 (about 3.6 billion) was derived from ACI's 2019 total of 9.2 billion minus its reported loss of more than 5.6 billion, and 2021 (about 4.6 billion) from the 2022 total divided by ACI's stated 43.8% growth. Passengers per movement and international shares are our calculations from ACI data. Percentage changes are ACI's own, computed from unrounded data, so they may differ slightly from changes calculated using the rounded totals shown. Where the preliminary and final releases differ (for example, growth versus 2019 of 7.3% preliminary versus 6.5% final, and 101.5 million versus 103.1 million aircraft movements), the final figure is used. OAG route data measures scheduled seats in both directions, not passengers flown. F marks forecasts; ACI's 2026 forecast predates the 2026 Middle East airspace disruption.
Author:
Amy LancelotteJob/Position: Senior Writer & Content Strategist
Amy Lancelotte is a Senior Content Writer and editorial contributor at AirAdvisor with over seven years of experience producing research-based articles for international audiences. Her work focuses on travel, aviation, and air passenger rights, with an emphasis on factual accuracy, verified data, and clear, reader-first explanations.
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