Your Flight
We analysed more than 5,500 data points along your route from San Francisco International Airport, San Francisco to St. Louis Lambert International Airport, St Louis.
United Airlines
SFO
STL
UA5304
United Airlines · Live forecast
SFO
→
STL
80
Calm Score
"A smooth ride ahead — sit back and enjoy."
6h 8m
Duration
1,504 nm
Distance
35,000 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 7 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 → STL
3 pilot reports along this route
1 / 3
Reporting smooth
2 / 3
Light turbulence
0
Moderate or worse
Latest pilot reports
Smooth
ASE UA /OV ASE273015/TM 1509/FL140/TP P180/TA M11/IC TRACE RIME
9m ago
Light
ARP UAL2316 3758N 11055W 1504 F280 343/088KT TB CONT LGT CHOP IC
14m ago
Light
GUC UA /OV HBU235017/TM 1502/FL310/TP A321/TB CONS LGT CAT/RM MOD MTN 30 DEGREE BANK +/-15KTS ZDVWC
16m ago
AI-powered flight briefing
5,500 data points analyzed
· HIGH confidence
Your Journey Beta
3 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 over the Sierra Nevada and over the Rocky Mountains – these areas 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 calm conditions around the airport.
Winds Aloft
Winds at cruising altitude are about 76 knots. These winds are favorable and may get you there a few 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
Flight Timeline 6h 08min
Maximum turbulence expected per segment
Takeoff
Smooth
0:30-0:58
Light
0:58-1:26
Light
1:26-1:54
Light
1:54-2:22
Light
2:22-2:50
Light
2:50-3:18
Moderate
3:18-3:46
Light
3:46-4:14
Light
4:14-4:42
Light
4:42-5:10
Light
5:10-5:38
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
11 kt (290°)
Sky
Clear
Temperature
13°C
Conditions
VFR — Clear conditions, no delays expected
STL
St. Louis Lambert International Airport — Arrival
Visibility
9 mi
Wind
13 kt G31 (310°)
Sky
Scattered
Temperature
-6°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.