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OAG Top 20 Busiest International Routes: Kuala Lumpur-Singapore claims the global No1 busiest air passenger flight route

Kuala Lumpur International Airport

Spiralling demand for air travel across Asia is underlined as 14 of the world’s 20 busiest air passenger routes depart from and arrive at an Asian airporτ.

Kuala Lumpur-Singapore (KUL-SIN) has claimed the crown as the world’s busiest air passenger flight route. The one-hour connection between the two neighbouring capital cities in South East Asia topped the OAG Top 20 Busiest International Routes rankings with 30,537 flights in the 12 months to February 2018. Hong Kong-Taipei (HKG-TPE, 28,887 flights) placed second, with Jakarta-Singapore (CGK-SIN, 23,704) third, Hong Kong-Shanghai Pudong (HKG-PVG, 21,888) fourth, and Jakarta-Kuala Lumpur (CGK-KUL, 19,849) completing an all-Asian top 5.

Mayur Patel, Regional Sales Director JAPAC for OAG, said: “Given the robust expansion of air passenger travel across Asia Pacific and the fierce competition between carriers in the region, it is unsurprising that 14 of the world’s busiest 20 routes, including 8 of the top 10 routes, are between Asian city pairs.  This compares to two routes within Europe, two routes in North America, plus one route between North America and Europe and one route between destinations in the Middle East.”

Key results for Asia Pacific from the OAG Top 20 Busiest International Routes, include:

  • 14 intra-Asian routes were ranked in the Top 20 Busiest International Routes list, with 8 being between cities in North Asia, 4 connecting cities in South East Asia, and 2 city pairs bridging North Asia and South East Asia.
  • Hong Kong (HKG) was the busiest Asian airport hub featuring in 6 of the OAG Top 20 Busiest International Routes, with Singapore (SIG) featuring in 4 routes. Two airports, Kansai (KIX) and Seoul Incheon (ICN), featured in 3 routes.
  • Five Asian airports, Kuala Lumpur (KUL), Bangkok (BKK), Jakarta (CKG), Taipei (TPE) and Shanghai Pudong (PVG), featured on 2 of the global Top 20 routes. Beijing Capital (PEK) and Tokyo Narita (NRT) each featured on 1 route.
  • The highest on-time performance (OTP) among Asian routes in the global Top 20 was KIX-TPE with 83%, followed by BKK-SIN (80%) and ICN-KIX (78%). The congested skies over Mainland China, which cause frequent flight delays and cancellations, provide an explanation for the two lowest regional OTP ratings, which were for flights between Hong Kong and Mainland Chinese airports: HKG-PEK (57%), HKG-PVG (55%).

The increasingly competitive nature of Asian aviation markets is a stand-out feature of this year’s Top 20 Busiest International Routes rankings, reflecting that some are still transitioning through a developmental stage. All 8 Asian routes in the Top 10 Busiest Routes feature at least 6 competing airlines, with three routes (ICN-KIX, HKG-ICN and HKG-SIN) counting 8 carriers, and 9 airlines battling each other on the CKG-KUL route. The Osaka-Taipei (KIX-TPE) route, which placed 15th, tops them all with 11 airlines competing for passengers.

OAG Top 10 Busiest International Routes




(Mar 2017-Feb 2018)


Kuala Lumpur-Singapore



Hong Kong-Taipei






Hong Kong-Shanghai Pudong



Jakarta-Kuala Lumpur



Seoul Incheon-Kansai



Hong Kong-Seoul Incheon



New York LaGuardia-Toronto






Hong Kong-Singapore



While this intense level of competition offers impressive flight frequencies and competitive prices for consumers, it adds pressure to the operating costs and on-time perfomance of carriers, and may prove unsustainable over time. By contrast, more mature European and North American routes, such Dublin-London Heathrow (DUB-LHR), which placed 14th, and Chicago-Toronto (ORD-YYZ), ranked 20th , each have only four competing airlines.

Another highlight feature is the relatively high ratio of low-cost-carriers on some of the busiest Asian routes. Five intra-Asian city pairs on the Top 20 Busiest International Routes list count LCC penetration of more than 40%: KUL-SIN (43%), CGK-SIN (42%) CGL-KUL (47%), ICN-KIX (65%) and ICN-NRT (49%). Two Asian routes count between 30%-40% LCC penetration: BKK-SIG (31%) and KIX-TPE (30%). Three Asian routes, HKG-TPE, BKK-HKG and HKG-PEK are 100% operated by mainline airtlines, with zero LCC penetration, while HKG-PVG is 95% operated by mainline airlines.

Co-Founder & Chief Editor - TravelDailyNews Media Network | + Articles

Vicky is the co-founder of TravelDailyNews Media Network where she is the Editor-in Chief. She is also responsible for the daily operation and the financial policy. She holds a Bachelor's degree in Tourism Business Administration from the Technical University of Athens and a Master in Business Administration (MBA) from the University of Wales. She has many years of both academic and industrial experience within the travel industry. She has written/edited numerous articles in various tourism magazines.