How turbulent is SYD-SIN typically?

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

What is the best altitude to avoid turbulence on SYD-SIN?

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 SYD-SIN?

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 SYD → SIN. Sydney to Singapore. SkyBriefing.

Sydney to Singapore: what the SYD to SIN corridor looks like

Departure: Sydney Kingsford Smith Airport, Sydney, Australia
Arrival: Singapore Changi Airport, Singapore, Singapore
Great-circle distance: 6,294 km (3,398 nm)
Typical airborne time: 7h 49m
Usual cruise levels: FL340 to FL400
Initial track: northwest bound

Route overview

Sydney Kingsford Smith Airport (SYD) in Sydney, Australia, to Singapore Changi Airport (SIN) in Singapore, Singapore, is a great-circle distance of 6,294 km, about 3,398 nautical miles. At typical jet cruise speeds, and with an allowance for climb, descent and approach, that works out to roughly 7h 49m of airborne time. The great-circle track leaves Sydney northwest bound and spends most of the flight in tropical air.

Leaving Sydney

Sydney Kingsford Smith sits on Botany Bay with the Blue Mountains inland. Southerly buster conditions bring an abrupt wind shift along the coast, and that is the main local factor on departure. The great-circle track leaves SYD northwest bound, and the first waypoint band of the flight sits close to 25.1S 139.4E. On a sector of 7h 49m, the climb to cruise takes roughly the first twenty to twenty five minutes.

Tropical convection along the route

Along the way the track passes over the equator. The midpoint of the SYD to SIN track lies near 16.3S 127.6E, about 3,147 km from Sydney, 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

Long haul crews normally start cruise around FL340, then step climb toward FL380 or FL400 as the aircraft burns off fuel and can hold a higher level. 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 Singapore

Arrivals into Changi descend through deep tropical air. Cells here are compact and visible on radar, so the crew routes around them and the approach itself is usually settled. Descent normally begins around 7.5S 115.8E, roughly 1,574 km before SIN, 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 SYD to SIN, so you can see what to expect before you board.