How turbulent is HND-HKG typically?

Light to moderate. The strongest chop sits near the jet core, and crews plan cruise levels around it.

What is the best altitude to avoid turbulence on HND-HKG?

Flying above the jet core, generally FL380-FL410, gives the smoothest ride. Below it the shear is stronger.

When is the best time of year to fly HND-HKG?

Summer and early autumn, when the East Asian jet is at its weakest. Winter brings the strongest core winds.

What causes the turbulence on this route?

Shear at the boundary of the East Asian jet stream, the strongest sustained upper wind on the planet.

Turbulence forecast HND → HKG. Tokyo Haneda to Hong Kong. SkyBriefing.

Tokyo to Hong Kong: what the HND to HKG corridor looks like

Departure: Tokyo Haneda Airport, Tokyo, Japan
Arrival: Hong Kong International Airport, Hong Kong, Hong Kong SAR
Great-circle distance: 2,902 km (1,567 nm)
Typical airborne time: 3h 52m
Usual cruise levels: FL330 to FL390
Initial track: southwest bound

Route overview

Tokyo Haneda Airport (HND) in Tokyo, Japan, to Hong Kong International Airport (HKG) in Hong Kong, Hong Kong SAR, is a great-circle distance of 2,902 km, about 1,567 nautical miles. At typical jet cruise speeds, and with an allowance for climb, descent and approach, that works out to roughly 3h 52m of airborne time. The great-circle track leaves Tokyo southwest bound and spends most of the flight in subtropical air.

Leaving Tokyo

Tokyo Haneda sits on Tokyo Bay at sea level. Winter departures enter the East Asian jet stream unusually early because that jet sits directly over Japan, so the climb transitions into strong upper wind quickly. The great-circle track leaves HND southwest bound, and the first waypoint band of the flight sits close to 32.2N 133.3E. On a sector of 3h 52m, the climb to cruise takes roughly the first twenty to twenty five minutes.

The East Asian jet stream

The midpoint of the HND to HKG track lies near 28.9N 126.8E, about 1,451 km from Tokyo, which is where the corridor spends its longest continuous stretch at cruise level. This corridor lies under one of the strongest sustained upper winds on the planet, the East Asian jet stream. Eastbound flights ride it and arrive earlier, westbound flights are routed around the core to avoid the headwind. The turbulence here is clear air turbulence generated at the jet boundary, and it is a well mapped, well forecast feature of the region.

Cruise altitudes on this sector

Medium haul sectors typically level off between FL330 and FL390, with a single step climb once fuel burn has lightened the aircraft. Choice of level matters because turbulence is layered: a change of two or three thousand feet often puts the aircraft into calmer air, and that is one of the first adjustments a crew will request.

Arriving into Hong Kong

Arrivals into Hong Kong pass close to Lantau Island's high ground. In an easterly the air spilling over those peaks makes the final approach noticeably lively, which is a local terrain effect rather than a weather event. Descent normally begins around 25.6N 120.4E, roughly 726 km before HKG, and takes about half an hour from cruise level to touchdown.

Seasonal pattern

The East Asian jet stream peaks in winter and weakens through the summer, so late summer and early autumn sectors are usually the smoothest on this corridor.

Flying this route with less worry

Turbulence on this corridor is a comfort issue rather than a safety one. Airliners are certified to handle loads well beyond anything the atmosphere produces here, crews are trained for it, and the seat belt sign is the tool that keeps the cabin settled. What this page adds is knowing in advance: the map and Calmness Score above use current WAFS forecast data for HND to HKG, so you can see what to expect before you board.