How turbulent is LAX-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 LAX-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 LAX-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 LAX → HKG. Los Angeles to Hong Kong. SkyBriefing.

Los Angeles to Hong Kong: what the LAX to HKG corridor looks like

Departure: Los Angeles International Airport, Los Angeles, the United States
Arrival: Hong Kong International Airport, Hong Kong, Hong Kong SAR
Great-circle distance: 11,664 km (6,298 nm)
Typical airborne time: 14h 04m
Usual cruise levels: FL320 to FL410
Initial track: northwest bound

Route overview

The LAX to HKG sector connects Los Angeles International Airport in Los Angeles, the United States, with Hong Kong International Airport in Hong Kong, Hong Kong SAR. Measured along the great circle the two airports are 11,664 km apart, roughly 6,298 nautical miles, which is close to 14h 04m in the air before winds and routing are taken into account. The initial track is northwest bound, and the middle of the route sits in subtropical latitudes.

Leaving Los Angeles

Los Angeles International sits on the Pacific shoreline with the San Gabriel Mountains inland. Departures climb over water into the marine layer, and Santa Ana conditions in autumn add downslope wind from the ranges. The great-circle track leaves LAX northwest bound, and the first waypoint band of the flight sits close to 31.0N 150.3W. On a sector of 14h 04m, the climb to cruise takes roughly the first twenty to twenty five minutes.

The East Asian jet stream

Along the way the track passes over the open Atlantic and the open Pacific. The midpoint of the LAX to HKG track lies near 28.1N 2.2W, about 5,832 km from Los Angeles, which is where the corridor spends its longest continuous stretch at cruise level. The East Asian jet stream dominates the winds along this track. Its core is narrow and its position moves day to day, which is why dispatchers replan the route each cycle. Clear air turbulence sits at the edges of that core, and the WAFS forecast shows where it is expected before the flight departs.

Cruise altitudes on this sector

Ultra long sectors begin cruise lower, often near FL320 because of the fuel load, and finish two or three step climbs higher, up to FL400 or FL410. 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 25.2N 145.8E, roughly 2,916 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

It is worth remembering that turbulence of the kind found on the LAX to HKG track is uncomfortable and entirely within what the aircraft is built for. Wings are designed to flex, the flight is planned around the forecast, and the crew adjusts level or track when it helps. The live forecast above shows the current picture for this corridor so there are fewer surprises on the day.