The Busiest Flight Routes in the World in 2025

As global air travel settled into a new rhythm in 2025, OAG’s latest Busiest Flight Routes in the World report offers a clear picture of where travelers have been flying the most across the year. Based on scheduled seat capacity, the rankings highlight the air corridors that carried the highest volumes of passengers worldwide, and they are overwhelmingly concentrated in one region.

Nine of the world’s top ten busiest routes operate within the Asia-Pacific, underlining the region’s dense city pairings, high-frequency flights, and sustained demand for short-haul travel. Leading the flight route list is Jeju (CJU)–Seoul Gimpo (GMP), which retains its long-held crown as the world’s busiest airline route, clocking 14.4 million scheduled seats in 2025 alone. Japan claims both the second and third spots, reflecting the country’s deeply entrenched culture of domestic air travel and the scale at which its major cities remain connected throughout the year. India also makes a strong showing. The Mumbai–Delhi corridor ranks as the eighth-busiest domestic route globally, with 7,642,016 scheduled seats in 2025, an emphatic marker of how indispensable this air bridge continues to be for business, leisure, and everyday movement between the two metros.

Below, see the busiest flight routes around the world—as well as the busiest flight routes within the US—according to OAG’s 2025 data.

How was this list compiled?

OAG compiles these annual rankings by analyzing scheduled seat capacity across the calendar year, counting flights in both directions to determine the most heavily traveled airline routes worldwide.

The busiest flight routes around the world

The busiest international flight routes

The busiest US flight routes

A version of this article was originally published on Condé Nast Traveller India