Cathay Pacific LHR HKG CX254
Cathay Pacific · Live forecast
LHR → HKG
CX254 · Mar 16, 2026 · 22:05 GM
90
Calm Score
"A smooth ride ahead — sit back and enjoy."
12h 40m
Duration
5,200 nm
Distance
39,000 ft
Cruise Altitude
HIGH
Confidence
Turbulence comfort along route
Comfort score combines turbulence probability with intensity — higher means rougher
Smooth Light Moderate Severe
Set an alert before your flight Beta
You still have 16 hours before departure. We'll notify you if this forecast changes.
💙
We know turbulence can feel scary — especially on long flights. This report is built for you: what bumps feel like, when they happen, and why you'll be completely safe. 1 in 3 passengers feel exactly like you.
AI-powered flight briefing
18,500 data points analyzed · HIGH confidence
Your Flight

We analysed more than 18,500 data points along your route from London Heathrow Airport, London to Hong Kong International Airport, Hong Kong.

Your Journey Beta

9 hours into the flight: Some moderate bumps expected.
The crew may adjust altitude or ask you to stay seated during these sections.
The rest of the flight should be smooth.

Your route takes you crossing the North Sea, crossing the Baltic Sea, over the Tian Shan, and across the Gobi Desert – these areas can sometimes cause turbulence.

Smooth Flight

We're expecting smooth conditions throughout your flight. You can sit back and relax.

Takeoff

Takeoff should feel smooth with possible light bumps, with calm conditions around the airport.

Winds Aloft

Winds at cruising altitude are about 43 knots. These winds are favorable and may get you there up to 42 minutes early.

Landing

Landing should feel smooth with possible light bumps with typical approach conditions.

You're in Safe Hands

If you feel nervous at any point, remember that turbulence is expected, safe, and part of normal flying. The crew is monitoring everything, and the aircraft is built to handle far more than anything you will feel. Have a safe and calm flight.

Relaxation Exercises
ZeroTurb Index (ZTI): Powered by our turbulence prediction algorithm combining atmospheric Richardson Number, wind shear analysis, temperature gradients, and geomagnetic activity. Learn more
Live data from ECMWF global forecast models · 12 atmospheric pressure levels · Updated every 6 hours
Flight Timeline 12h 40min
Maximum turbulence expected per segment
Takeoff
Light
0:30-1:00
Light
1:00-1:30
Smooth
1:30-2:00
Smooth
2:00-2:30
Smooth
2:30-2:59
Smooth
2:59-3:28
Smooth
3:28-3:57
Smooth
3:57-4:26
Smooth
4:26-4:55
Light
4:55-5:24
Smooth
5:24-5:53
Smooth
5:53-6:22
Light
6:22-6:51
Light
6:51-7:20
Light
7:20-7:49
Light
7:49-8:18
Light
8:18-8:47
Light
8:47-9:16
Moderate
9:16-9:45
Light
9:45-10:14
Light
10:14-10:43
Light
10:43-11:12
Light
11:12-11:41
Light
11:41-12:10
Light
Landing
Light
Smooth
Light
Moderate
Severe
Longer bars indicate higher turbulence intensity. Values shown are the maximum for each time segment.
Airport conditions
Live weather at departure and arrival
LHR London Heathrow Airport — Departure
Wind
6 kt (250°)
Sky
Broken
Temperature
5°C
Conditions
VFR — Clear conditions, no delays expected
HKG Hong Kong International Airport — Arrival
Wind
10 kt (270°)
Sky
Unknown
Temperature
24°C
Conditions
VFR — Clear conditions, no delays expected
Your flight details
Departure timing and aircraft information
Evening Flight Departure
Time of day
Evening Flight
Tip
Evening and night flights typically offer smoother conditions as thermal activity subsides and the atmosphere stabilizes after sunset.
When
Today
Data sources & our approach
ZeroTurb's Custom Algorithm: Our proprietary ZeroTurb Index (ZTI) combines three meteorological indices weighted by their predictive accuracy — giving you transparent, passenger-focused turbulence probability instead of vague categories.

This forecast integrates data from:

Disclaimer: This forecast is for informational purposes only. Always consult official aviation weather sources and follow ATC guidance.