United Airlines LHR SFO UA900
United Airlines · Live forecast
LHR → SFO
UA900 · Jul 27, 2026 · 10:35 BS
Also sold as: BA285 British Airways
80
Calm Score
"A smooth ride ahead — sit back and enjoy."
11h 0m
Duration
4,652 nm
Distance
40,000 ft
Cruise Altitude
HIGH
Confidence
Turbulence comfort along route
Comfort score combines turbulence probability with intensity, higher means rougher
Smooth Light Moderate Severe

Notifications not available
Your flight departs in less than 6 hours. The forecast is unlikely to change significantly at this point.

💙
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.
Right now on your route
Live pilot reports from aircraft flying LHR → SFO
15 pilot reports along this route
15 / 15
Reporting smooth
0 / 15
Light turbulence
0
Moderate or worse
Latest pilot reports
Smooth
ARP ICE28T 5850N01148W 0921 F350 5800N01003W 0930 ETSOM MS52 271/108 KT TFICE QXS BRR 270921 F10A
5m ago
Smooth
ARP DLH451 6053N02906W 0918 F370 5929N02001W 0951 GOMUP MS39 011/15 KT DABPL DDL KEF 270918 L40A
8m ago
Smooth
ARP BMW54 5652N01352W 0917 F430 SUNOT 0922 5800N02000W MS48 263/46 KT DAUTO DDL TRE 270917 F12A
9m ago
Smooth
ARP ETD53M 6133N03209W 0917 F360 5930N04000W 0947 5600N05000W MS45 032/46 KT A6BLW QXT EUA 270918 L58A
9m ago
Smooth
ARP BMW54 5646N01301W 0913 F430 SUNOT 0922 5800N02000W MS49 268/49 KT DAUTO DDL TRE 270913 F11A
13m ago
AI-powered flight briefing
16,500 data points analyzed · HIGH confidence
Your Flight

We analysed more than 16,500 data points along your route from London Heathrow Airport, London to San Francisco International Airport, San Francisco.

Your Journey Beta

15 minutes, 4 hours 30 minutes, and 8 hours 40 minutes 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 Atlantic Ocean, over the Rocky Mountains, and over the Sierra Nevada – 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 a bit bumpy initially, with calm conditions around the airport.

Winds Aloft

Winds at cruising altitude are about 57 knots. These winds may delay arrival by up to 59 minutes.

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 11h 00min
Maximum turbulence expected per segment
Takeoff
Moderate
0:30-1:00
Light
1:00-1:30
Light
1:30-2:00
Light
2:00-2:30
Light
2:30-3:00
Smooth
3:00-3:30
Light
3:30-4:00
Light
4:00-4:30
Light
4:30-5:00
Moderate
5:00-5:30
Light
5:30-6:00
Light
6:00-6:30
Light
6:30-7:00
Light
7:00-7:30
Light
7:30-8:00
Light
8:00-8:30
Light
8:30-9:00
Moderate
9:00-9:30
Light
9:30-10:00
Light
10:00-10:30
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
10 kt (280°)
Sky
Scattered
Temperature
20°C
Conditions
VFR — Clear conditions, no delays expected
SFO San Francisco International Airport — Arrival
Wind
20 kt G30 (270°)
Sky
Clear
Temperature
15°C
Conditions
VFR — Clear conditions, no delays expected
Your flight details
Departure timing and aircraft information
Morning Flight Departure
Time of day
Morning Flight
Tip
Morning flights typically experience smoother conditions as the atmosphere is more stable and thermal turbulence hasn't yet developed.
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.

Fly this route, calmly Game · Beta A calming mini-game, not a forecast. Glide LHR → SFO through soft clouds, nothing to crash into.