How long is flight CX256?

The HKG to LHR route is the basis for the schedule. View the full route forecast and typical duration on the Turbcast route page.

Flight CX256

CX256 Turbulence ForecastCathay Pacific · HKG → LHR

About flight CX256

Airline: Cathay Pacific (CX)
Route: HKG → LHR
Typical Aircraft: B777
Distance: 9,631 km
Duration: 11h 42m
Cruise Altitude: FL410

See today’s turbulence forecast

Cathay Pacific CX256 flies the standard route profile from Hong Kong to London. Conditions change hour to hour — view the live forecast for your departure date.

View live forecast

Turbulence on the HKG → LHR route

The route crosses mid-latitudes where the polar jet can influence flight conditions, though exposure is shorter than on genuine long-haul crossings. A large portion of the flight crosses open ocean (Indian Ocean), where upper-level conditions are generally smoother than over continental terrain.

Calmest season: Late spring and early autumn. Seasonal turbulence on this route is modest — most variation comes from day-to-day weather rather than strong seasonal cycles.

Full HKG to LHR route guide

Frequently asked questions

Is CX256 usually a bumpy flight?

Cathay Pacific CX256 operates between HKG and LHR. Whether it’s bumpy depends on the day’s weather — Turbcast pulls live NOAA aviation-grade data so you can check the actual forecast for your departure date rather than relying on averages.

What aircraft does CX256 use?

CX256 is typically operated by the B777. Aircraft swaps happen — confirm with your booking before flying.

How long is the HKG to LHR flight?

Approximately 11h 42m direct, covering 9,631 km at a typical cruise of FL410.

When does CX256 have the smoothest weather?

Historically calmest during Late spring and early autumn. Forecast accuracy improves as you get closer to departure — within 48 hours the NOAA WAFS model is at peak skill.

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