Your Flight
We analysed more than 2,000 data points along your route from San Francisco International Airport, San Francisco to Seattle–Tacoma International Airport, Seattle.
Southwest Airlines
SFO
SEA
WN4854
Southwest Airlines · Live forecast
SFO
→
SEA
82
Calm Score
"A smooth ride ahead — sit back and enjoy."
2h 10m
Duration
590 nm
Distance
31,000 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 17 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.
Right now on your route
Live pilot reports from aircraft flying SFO → SEA
2 pilot reports along this route
2 / 2
Reporting smooth
0 / 2
Light turbulence
0
Moderate or worse
Latest pilot reports
Smooth
BLI UA /OV BLI/TM 0441/FL002/TP B738/RM DURC RY 34.
3m ago
Smooth
SEA UA /OV SEA340004/TM 0427/FL034/TP B39M/SK BKN034
17m ago
AI-powered flight briefing
2,000 data points analyzed
· HIGH confidence
Your Journey Beta
Your route takes you over the Sierra Nevada – conditions there can sometimes cause light 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 61 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 2h 10min
Maximum turbulence expected per segment
Takeoff
Light
0:20-0:50
Light
0:50-1:20
Light
1:20-1:50
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
5 kt (300°)
Sky
Clear
Temperature
18°C
Conditions
VFR — Clear conditions, no delays expected
SEA
Seattle–Tacoma International Airport — Arrival
Wind
12 kt (210°)
Sky
Overcast
Temperature
5°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
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.