Jeju (CJU) to Seoul (GMP) continues to be the busiest domestic route in the world with 1.2 million seats in November 2023 and an increase in seats per day of 9% compared to last month. Fukuoka (FUK) to Tokyo Haneda (HND) has moved up one place to be the second busiest route with 951,820 seats.

As of February 2026, the title for the busiest domestic flight route in the world continues to be held by the Jeju (CJU) to Seoul Gimpo (GMP) route in South Korea. This short hop carries over 14 million passengers annually, with planes taking off roughly every 10–15 minutes. In terms of international routes, the busiest for 2026 is the Hong Kong (HKG) to Taipei (TPE) corridor, which consistently sees the highest seat capacity globally. Other high-density 2026 routes include Kuala Lumpur to Singapore and Cairo to Jeddah. Interestingly, 2026 data shows a massive surge in the Mumbai to Delhi domestic route, which has moved into the global top five. These rankings are driven by high-frequency "commuter" demand where high-speed rail is either unavailable or less convenient than a 60-minute flight, leading to thousands of "shuttle" style departures every single month across these mega-hubs.