Route turbulence forecast
Sydney → Tokyo
Turbulence forecast for flights from Sydney Kingsford Smith International Airport (SYD) to Tokyo Haneda International Airport (HND).
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Get a segment-by-segment turbulence forecast for any scheduled flight from SYD to HND, with live wind and pilot reports.
Live status with real-time delays and cancellations.
What to expect on this route
Northbound · Great-circle bearing -10°
The route crosses mid-latitudes where the polar jet can influence flight conditions, though exposure is shorter than on genuine long-haul crossings. The route crosses or passes near the Japanese Alps, which can generate mountain-wave turbulence downwind when upper-level winds are strong. At tropical latitudes, convective turbulence from thunderstorms is the main driver — pilots generally route around storm cells, but afternoon/evening flights encounter more build-up than morning departures.
- Mountain crossings
- Japanese Alps
- Ocean / water segments
- South Pacific · Tasman Sea · North Pacific
Seasonal turbulence pattern
This corridor is most turbulent in the relevant hemisphere’s winter, when the jet stream is strongest and sits closer to the route. Wind flowing over the Japanese Alps can generate mountain-wave turbulence that extends hundreds of kilometres downwind — most pronounced in the relevant hemisphere’s winter, when upper-level winds are strongest. At tropical latitudes, convective (thunderstorm-driven) turbulence dominates during regional wet seasons and monsoon cycles, typically worst in the afternoon and evening.
- Peak turbulence
- Regional wet season (varies by location)
- Typically calmest
- Dry season
SYD → HND turbulence FAQ
Is the Sydney to Tokyo flight usually bumpy?
Most of the 7,818 km route sits in the mixed band with moderate jet-stream exposure. Historically that means occasional clear-air turbulence at cruise altitude is normal, especially in winter. Mountain-wave effects near the Japanese Alps add short bumpy stretches when upper-level winds are strong.
When is the best time to fly SYD to HND for a smooth flight?
Statistically, Dry season sees the calmest conditions for this corridor. Within any season, morning departures see less convective (thunderstorm-driven) turbulence than afternoon flights.
How long is the flight from SYD to HND?
Block time is usually around 9h 35m direct, cruising at approximately FL390 (39,000 ft). Actual duration varies with winds — tailwinds can shave 15–30 minutes, headwinds can add 30+ minutes on this northbound sector.
How accurate is Turbcast's forecast for this route?
We use live NOAA Aviation Weather Center pilot reports (PIREPs), SIGMETs and AIRMETs, layered with physics-based Ellrod and Richardson-number calculations from Open-Meteo pressure-level wind and temperature data. If a source is unavailable for a waypoint we show an em dash rather than invent a value.
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