The aviation data analytics company OAG, based in the UK, recently released a report on the world’s busiest international airline routes in July 2025. This report revealed that the top five busiest routes are all located within the Asia-Pacific region, Africa, and the Middle East. Surprisingly, no European or Latin American routes made it to the top ten list, with only one transatlantic route included. The majority of the busiest routes connect destinations within Asia-Pacific, Africa, or the Middle East.

Maintaining its top spot, the route between Hong Kong International Airport (HKG) and Taipei Taoyuan International Airport (TPE) remains the world’s busiest international air route, according to OAG. In July 2025, this route is expected to have 581,965 available seats, which is the same capacity reported during the same period last year. This route was also ranked as the busiest international route in 2024, with a total of 6. 8 million seats and a 48% increase in capacity compared to 2023. The popularity of this route can be attributed to both business travelers and tourists.

Competition is fierce among airlines operating on this route. Currently, seven airlines offer nonstop service between Hong Kong and Taipei, including China Airlines, Cathay Pacific, Greater Bay Airlines, Hong Kong Airlines, Hong Kong Express, STARLUX Airlines, and EVA Air. These airlines use various aircraft types in their fleets, with the Airbus A330 being a popular choice. The flight time between the two cities is relatively short, with an average duration of two hours.

The rankings for the top ten busiest international routes are dominated by the Asia-Pacific region. Among these, only three are from different geographical regions. The second-busiest international route this month is from Cairo International Airport (CAI) in Egypt to Jeddah King Abdulaziz International Airport (JED) in Saudi Arabia, with 491,047 seats. This represents a 5% increase in capacity compared to last year. The third-busiest international route is from Kuala Lumpur International Airport (KUL) to Singapore Changi Airport (SIN), with 484,750 seats. This route has seen a 4% year-on-year growth, driven by factors such as tourism, strong economic ties, and social connections between the two cities. Both Kuala Lumpur and Singapore serve as major aviation hubs, offering extensive flight connections to destinations across the Pacific and East Asia.

Following closely behind KUL-SIN is the route between Seoul Incheon International Airport (ICN) and Tokyo Narita International Airport (NRT), with 426,312 seats this month. The fifth-busiest international route is from Seoul Incheon (ICN) to Osaka Kansai Airport (KIX), with 417,754 seats.

Aside from the busiest international routes, OAG also analyzed the busiest routes in the United States this month.