London Heathrow retained its position as the world’s most connected airport in 2025, offering 59,240 connections to 226 destinations, per OAG’s Megahubs report.
Istanbul Airport rose to second place with a 25pc increase in connections, followed by Amsterdam Schiphol in third and Kuala Lumpur in fourth.
Chicago O’Hare ranked seventh globally and first in North America, providing 65,000 connections to 297 destinations on 1 August 2025.
Global air traffic in 2024 surpassed 2019 levels by 3.8pc, with 2025 showing continued growth, according to IATA data.
Atlanta Hartsfield-Jackson, ranked eighth globally, joined Chicago as the only North American airports in the top ten.
Ten most connected global airports in 2025 with Dominant Airline
- 1 London Heathrow (LHR) British Airways
- 2 Istanbul (IST) Turkish Airlines
- 3 Amsterdam Schiphol (AMS) KLM
- 4 Kuala Lumpur International (KUL) AirAsia
- 5 Frankfurt (FRA) Lufthansa
- 6 Seoul Incheon International (ICN) Korean Air
- 7 Chicago O’Hare International (ORD) United Airlines
- 8 Atlanta Hartsfield-Jackson International (ATL) Delta Air Lines
- 9 Tokyo Haneda (HND) All Nippon Airways
- 10 Paris Charles de Gaulle (CDG) Air France
Ten most connected U.S. airports in 2025 with Dominant Airline
- 1 Chicago O’Hare International (ORD) United Airlines
- 2 Atlanta Hartsfield-Jackson International (ATL) Delta Air Lines
- 3 Dallas/Fort Worth International (DFW) American Airlines
- 4 Denver International (DEN) United Airlines
- 5 Charlotte Douglas International (CLT) American Airlines
- 6 Seattle-Tacoma International Airport (SEA) Alaska Airlines
- 7 Boston Logan International (BOS) Delta Air Lines
- 8 Detroit Metropolitan Wayne County (DTW) Delta Air Lines
- 9 Houston George Bush Intercontinental (IAH) United Airlines
- 10 Los Angeles International (LAX) Delta Air Lines
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