CX251 Hong KongHKG · 22:45 LondonLHR · 05:40
CX251 by Cathay Pacific flies from Hong Kong (HKG) to London (LHR).
estimated arrival at LHR · local time · ~1h 54m from now
position updated 4m ago · checking again in 90s
Live position · flown path, last 3h 12m
Where the minutes go
last 7 operations · gate push → arrivalThe bar is how late it left the gate; the ring is where it actually arrived. Board clocks, not estimates.
The last 30 days
arrival outcome per operationmedian arrival −4 min · 0 cancelled · 15 operations tracked
The route today
live boardsWeather lens
Delay & cancellation outlook for this flight
Measured, 90-day sampleConditions at HKG and LHR are near their clear-air norm right now, so this reflects the route's recent baseline rather than a weather penalty. For this route and airline, under conditions like today's, over the last 90 days.
Pro Flight Search tracking, 90 days · the weather × delay correlation study → · live weather risk by airport →
When it flies
scheduled departuresEach mark is a scheduled departure at its origin-local time. Today is highlighted.
Other Hong Kong to London flights today
same route · Cathay PacificIf CX251 is cancelled, these are the other Cathay Pacific nonstop flights from Hong Kong to London on the same day, with scheduled departure times in HKG local time. Most flights posting a delay still operate — rebooking usually only beats a very large posted delay. Every airline on this route →
How CX251 actually runs
Pro Flight Search has tracked every published board update for CX251 across the HKG and LHR boards: schedule changes, gate pushes and actual clocks. Usually lands on time. Based on 12 confirmed landings · 10/12 within 15 min of schedule. Pushes back late but makes up time in the air.
The verdict above is that record speaking, so it reflects how CX251 operates rather than what the timetable promises. Numbers refresh as new flights operate.
How this operation is measured
Board log
scheduled → actual, per operationAircraft
Recent tails: B-KPD.
Board clocks recorded as HKG and LHR published them.
Planning around CX251? Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Pro Flight Search — CX251 Hong Kong to London on-time performance, measured from the HKG and LHR airport boards.
https://proflightsearch.com/flight/CX251
.