Your Flight
We analysed more than 16,500 data points along your route from San Francisco International Airport, San Francisco to London Heathrow Airport, London.
United Airlines
SFO
LHR
UA901
United Airlines · Live forecast
SFO
→
LHR
89
Calm Score
"A smooth ride ahead — sit back and enjoy."
10h 35m
Duration
4,652 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
Notifications not available
This flight has already departed.
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 SFO → LHR
15 pilot reports along this route
15 / 15
Reporting smooth
0 / 15
Light turbulence
0
Moderate or worse
Latest pilot reports
Smooth
ARP AFR086 6208N03101W 1947 F400 6300N04000W 2017 6300N05000W MS44 159/6 KT FHTYG QXS RKV 011947 J45A
3m ago
Smooth
ARP BAW171 6135N03447W 1946 F400 6201N04000W 2004 6201N05000W MS44 311/8 KT GZBJC DDL KUS 011946 L64A
4m ago
Smooth
ARP BAW5VY 6138N03456W 1945 F350 6202N04000W 2003 6202N05001W MS47 158/19 KT GYMMR DDL KUS 011945 F57A
5m ago
Smooth
ARP AUA7K 6152N03200W 1942 F380 6147N03300W 1946 6100N04000W MS47 328/10 KT OELPL DDL KEF 011942 L44A
8m ago
Smooth
ARP VIR41R 5924N01728W 1941 F340 6002N01958W 1951 6202N02959W MS49 345/6 KT GVAHH DDL VEY 011941 L23A
9m ago
AI-powered flight briefing
16,500 data points analyzed
· HIGH confidence
Your Journey Beta
2 hours 25 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 over the Sierra Nevada, over the Rocky Mountains, and crossing the North Atlantic Ocean – 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 34 knots.
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
Flight Timeline 10h 35min
Maximum turbulence expected per segment
Takeoff
Light
0:30-0:59
Light
0:59-1:28
Light
1:28-1:57
Light
1:57-2:26
Moderate
2:26-2:55
Light
2:55-3:24
Smooth
3:24-3:53
Smooth
3:53-4:22
Smooth
4:22-4:51
Smooth
4:51-5:20
Light
5:20-5:49
Light
5:49-6:18
Light
6:18-6:47
Light
6:47-7:16
Light
7:16-7:45
Smooth
7:45-8:13
Smooth
8:13-8:41
Smooth
8:41-9:09
Light
9:09-9:37
Light
9:37-10:05
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
SFO
San Francisco International Airport — Departure
Wind
6 kt (310°)
Sky
Clear
Temperature
21°C
Conditions
VFR — Clear conditions, no delays expected
LHR
London Heathrow Airport — Arrival
Wind
11 kt (210°)
Sky
Unknown
Temperature
17°C
Conditions
MVFR — Reduced visibility, minor delays possible
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
boeing 777-224(er)
Category
Wide-Body Aircraft
Size
Large
Comfort
Large, twin-aisle aircraft like this generally provide the smoothest ride through turbulence due to their size, weight, and advanced stabilization systems.
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:
- ECMWF Open Data — Global atmospheric model (wind/temperature at 13 flight levels)
- NOAA Aviation Weather Center — Pilot Reports (PIREPs), SIGMETs/AIRMETs, TAFs
- NOAA Space Weather Prediction Center — Aurora forecasts for polar routes
- AviationStack API — Flight schedules and airline operational data
Disclaimer: This forecast is for informational purposes only. Always consult official aviation weather sources and follow ATC guidance.