How turbulent is BKK-HKG typically?

Smooth cruise punctuated by brief bumps near thunderstorm cells, more likely in the afternoon.

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

Lateral deviation around cells is the main tool. Where a climb helps, FL380-FL400 clears most of the smaller build-ups.

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

The dry season for the region, and early morning departures year round.

What causes the turbulence on this route?

Tropical thunderstorm cells and the rising air columns around them.

Turbulence forecast BKK → HKG. Bangkok to Hong Kong. SkyBriefing.

Bangkok to Hong Kong: what the BKK to HKG corridor looks like

Departure: Suvarnabhumi Airport, Bangkok, Thailand
Arrival: Hong Kong International Airport, Hong Kong, Hong Kong SAR
Great-circle distance: 1,690 km (913 nm)
Typical airborne time: 2h 28m
Usual cruise levels: FL330 to FL390
Initial track: northeast bound

Route overview

Suvarnabhumi Airport (BKK) in Bangkok, Thailand, to Hong Kong International Airport (HKG) in Hong Kong, Hong Kong SAR, is a great-circle distance of 1,690 km, about 913 nautical miles. At typical jet cruise speeds, and with an allowance for climb, descent and approach, that works out to roughly 2h 28m of airborne time. The great-circle track leaves Bangkok northeast bound and spends most of the flight in tropical air.

Leaving Bangkok

Suvarnabhumi lies on flat coastal delta land close to the Gulf of Thailand. In the wet season the climb out passes tropical convective cloud that builds through the afternoon, so early departures usually leave in calmer air. The great-circle track leaves BKK northeast bound, and the first waypoint band of the flight sits close to 15.8N 104.0E. On a sector of 2h 28m, the climb to cruise takes roughly the first twenty to twenty five minutes.

Tropical convection along the route

The midpoint of the BKK to HKG track lies near 18.0N 107.3E, about 845 km from Bangkok, which is where the corridor spends its longest continuous stretch at cruise level. The corridor runs through warm, moist tropical air where convective cloud builds during the day. Those cells are radar visible, so lateral deviations of a few miles are the normal tool. Cruise between the cells is typically smooth, and the bumpy sections are short.

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 20.2N 110.6E, roughly 423 km before HKG, and takes about half an hour from cruise level to touchdown.

Seasonal pattern

The regional wet season brings more convective cloud along this track. In the dry season, and on early morning departures year round, the cruise is usually settled.

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 BKK to HKG, so you can see what to expect before you board.