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Cathay Pacific CX251 flies the jet-stream exposed corridor from London to Hong Kong. Conditions change hour to hour — view the live forecast for your departure date.
View live forecastJet-stream exposure on this corridor is significant. Long mid-latitude legs mean clear-air turbulence is the dominant source of bumps, typically encountered at cruise altitude. Flying eastbound, aircraft usually benefit from tailwinds near the jet core, which trims flight time — but the edges of the jet are where clear-air turbulence most often sits.
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 LHR to HKG route guideCathay Pacific CX251 operates between LHR and HKG. 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.
CX251 is typically operated by the A359. Aircraft swaps happen — confirm with your booking before flying.
Approximately 11h 42m direct, covering 9,631 km at a typical cruise of FL410.
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.