CX251Cathay Pacific · HKG → LHR
live · 11m ago
Route confirmed Cathay Pacific

CX251 Hong KongHKG · 23:00 LondonLHR · 05:25

CX251 by Cathay Pacific flies from Hong Kong (HKG) to London (LHR) for the Sat, Oct 31 departure.

Right nowScheduled · today
23:00

departs HKG · on schedule

⚖ CX251 typically leaves +8 and lands −18. The air wins minutes back.
Typical gate push+8 minmedian posted departure
Typical arrival−18 minmedian over 16 operations
Wins back in air~26 minmedian gate push vs arrival · how planes make up time → Cancellation0 in 16tracked operations · cancellation odds calculator →

Where the minutes go

last 7 operations · gate push → arrival
0+30+60+90 min
10-31
−16 arrival
10-30
+27 gate · −16 arrival
10-29
+22 gate · −14 arrival
10-28
+43 gate · −21 arrival
10-27
+23 gate · −24 arrival
10-26
+18 gate · −25 arrival
10-25
+11 gate · −23 arrival

The 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 operation

median arrival −18 min · 0 cancelled · 16 operations tracked

The route today

live boards
HKGHong KongOn-time likelyHKG delay board →
LHRLondonOn-time likelyLHR delay board →
HKG→LHRevery carrier, schedules and on-time historyRoute intelligence →

Weather lens

Weather-conditioned outlook for this flight right now

Measured, 90-day sample
45%Chance of 15+ min delay
5.2%Chance of cancellation
+23 minTypical airport delay in this weather

Driven mainly by LHR (London), currently flying LIFR (low instrument). These figures come from both airports' records 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 →

Tomorrow at Hong Kong

Forecast

Sun 1 Nov, local date

High30°Clikely 29°C to 30°C
Low26°Clikely 25°C to 27°C
Outlook: below usual
Chance a departure is cancelled
0.4%usually 0.6%
Chance a departure leaves 60+ min late
3.0%usually 3.8%

Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · Based on about 440 departures a day. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

Tomorrow at London

Forecast

Sun 1 Nov, local date

High11°Clikely 9°C to 12°C
Low6°Clikely 4°C to 9°C
  • 35% chance of fog
Outlook: about usual
Chance a departure is cancelled
1.6%usually 1.8%
Chance a departure leaves 60+ min late
10.0%usually 9.1%

Forecast: WeatherTomorrow · incl. data from ECMWF (CC BY 4.0, modified) · Based on about 660 departures a day. · Expected values for tomorrow from a forecast model, kept apart from today's measured figures.

When it flies

scheduled departures
061422
M
T
W
T
F
S
S

Each mark is a scheduled departure at its origin-local time. Today is highlighted.

Other Hong Kong to London flights today

same route · Cathay Pacific
CX2255departs 00:15
CX255departs 00:15
CX2237departs 00:25
CX237departs 00:25
CX257departs 08:05
CX239departs 10:40

If 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 that show a delay still operate. Rebooking usually helps only when that delay is very large. 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 ~18 min early. Based on 14 confirmed landings · 13/14 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.

Technical record

How this operation is measured

board clocks

Board log

scheduled → actual, per operation
10-31HKG 23:00LHR 05:25 05:09 (−16)
10-30HKG 23:00 23:27 (+27)LHR 05:25 05:09 (−16)
10-29HKG 23:00 23:22 (+22)LHR 05:25 05:11 (−14)
10-28HKG 23:00 23:43 (+43)LHR 05:25 05:04 (−21)
10-27HKG 23:00 23:23 (+23)LHR 05:25 05:01 (−24)
10-26HKG 23:00 23:18 (+18)LHR 05:25 05:00 (−25)
10-25HKG 23:00 23:11 (+11)LHR 05:25 05:02 (−23)
10-24HKG 23:00 22:57 (−3)LHR 05:25 04:53 (−32)
10-23HKG 22:45 22:42 (−3)LHR 05:40 05:43 (+3)
10-22HKG 22:45 22:46 (+1)LHR 05:40 06:08 (+28)
10-21HKG 22:45 22:48 (+3)LHR 05:40 05:30 (−10)
10-20HKG 22:45 22:53 (+8)LHR 05:40 05:18 (−22)
10-19HKG 22:45 (+0)LHR 05:40 05:22 (−18)
10-18HKG 22:45 22:53 (+8)LHR 05:40 05:21 (−19)
10-17HKG 22:45 22:49 (+4)LHR 05:40 05:27 (−13)
10-16HKG LHR 05:40 05:11 (−29)

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

Cite this data

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Suggested citation

Pro Flight Search: CX251 Hong Kong to London on-time performance, measured from the HKG and LHR airport boards.

Canonical URL
https://proflightsearch.com/flight/CX251
How we measure this →