BUSIEST FLIGHT ROUTES IN THE WORLD

View and interrogate OAG’s ever-popular Busiest Airline Routes whenever you need as they evolve and change over time, regularly providing updates on the busiest flight routes in the world. These include the Top 10 Busiest Global Airline Routes, Top 10 Domestic Airline Routes and International Airline Routes by region. Our flight routes data is powered by Schedules Analyser.

Find extensive flight data and analysis for domestic and international airline routes below and discover the busiest air routes in the area of your choice.

KEY POINTS

• The top three busiest global domestic routes in June 2025 remain unchanged since last month and are all in Northeast Asia.
• South Korea’s Jeju International (CJU) - Seoul Gimpo (GMP) remains in first place globally with 1.15 million seats despite a 4% decrease in capacity compared to June 2024. This is followed by the Japanese air route connections of Sapporo New Chitose (CTS) to Tokyo Haneda (HND) and Fukuoka (FUK) to Tokyo Haneda (HND) in second and third place respectively.
  
• Jeddah (JED) to Riyadh (RUH) stands out as the fastest-growing route, with a 9% increase in seat capacity compared to June 2024, reflecting growing domestic demand within Saudi Arabia.
• The route with the largest decline in capacity is Beijing (PEK) to Shanghai Hongqiao (SHA) with capacity dropping by 8% year on year.

KEY POINTS

• Beijing (PEK) to Shanghai Hongqiao (SHA) remains the Busiest Domestic Route in China in June 2025 with 608,360 seats, although capacity has declined by 8% compared to June 2024.
• Shanghai (SHA) to Shenzhen (SZX) shows strong growth year on year with capacity growing by 5% and is the second busiest route with 575,685 seats.
• Guangzhou Baiyun (CAN) to Shanghai Hongqiao (SHA) is in third place with 518,610 seats.
• All of the top three routes are connecting Shanghai Hongqiao (SHA) to another large airport.
• Routes out of Shenzhen (SZX) are performing well year on year and are growing in capacity.
• Chengdu (CTU) to Shenzhen (SZX) has had the biggest increase in capacity compared to June 2024, adding 8% more seats.
  

KEY POINTS

• In June 2025, the transcontinental route between New York (JFK) to Los Angeles (LAX) is the Busiest Domestic route in the USA with 296,316 seats. This route has seen strong growth in capacity this month compared to June 2024 adding 13% more seats.
• New York La Guardia (LGA) to Chicago O’Hare (ORD) is the second busiest route with 293,198 seats and capacity is 6% higher than last year.
• Atlanta (ATL) to Orlando is the third busiest route with 278,481 seats.
• Four out of five routes from Los Angeles (LAX) in the Top 10 have positive year-over-year growth, with Los Angeles (LAX) to Chicago O’Hare (ORD), New York (JFK) and San Franscisco (AFO) all showing double-digit growth.

KEY POINTS

• In June 2025, Hong Kong (HKG) to Taipei (TPE) continues to be the busiest international route with 540,840 seats, a 1% increase in capacity compared to June 2024. Cairo (CAI) to Jeddah (JED) has moved up a place to be the second busiest route with 486,017 seats however capacity has dipped by 4% compared to last year. Kuala Lumpur (KUL) to Singapore Changi (SIN) is in third place with 478,184 seats with a capacity increase of 6% year on year.
  
  
• Osaka Kansai (KIX) to Shanghai Pudong (PVG) has seen a huge increase in capacity in June 2025 compared to last year, adding 57% more seats, and has moved up to be the ninth busiest international route. This route has also surpassed 2019 levels at 199,594 seats and capacity is at 337,848 seats in June 2025. Jakarta (CGK) to Singapore Changi (SIN) has also moved up into the Top 10 busiest international routes in sixth place. This route has had a significant increase in capacity this month compared to last year as well adding 20% more seats. Bangkok (BKK) to Hong Kong (HKG) and Tokyo Narita (NRT) to Taipei (TPE) have both dropped out of the Top 10 in June 2025 compared to last year.
  
  
• Five global regions are covered in the Top 10 Busiest International Routes:
  • Asia Pacific continues to dominate with seven routes
  • One within Middle East
  • One linking North America to Europe
  • One linking Africa to the Middle East.
  • Singapore Changi (SIN) has three routes in the Top 10 busiest international airports which makes it the most connected airport in the Top 10.

The busiest air routes are defined as those with the largest volume of scheduled airline seats in the current calendar month. Data is for flights in both directions on each route and is sourced from OAG Schedules Analyser in the first week of each month. The data reflects the most recent full calendar month for the busiest scheduled domestic and international aviation routes in each category.