Your Flight
We analysed more than 6,000 data points along your route from San Francisco International Airport, San Francisco to Nashville International, Nashville.
United Airlines
SFO
BNA
UA1273
United Airlines · Live forecast
SFO
→
BNA
78
Calm Score
"Mostly smooth — one short bumpy section you'll handle."
4h 16m
Duration
1,707 nm
Distance
39,000 ft
Cruise Altitude
VERY HIGH
Confidence
Turbulence comfort along route
Comfort score combines turbulence probability with intensity — higher means rougher
Smooth
Light
Moderate
Severe
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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 → BNA
15 pilot reports along this route
9 / 15
Reporting smooth
2 / 15
Light turbulence
4
Moderate or worse
Latest pilot reports
Smooth
ASE UA /OV 12NM E ASE/TM 1722/FL170/TP E75L/TB LGT-MOD CHOP/IC NEG
5m ago
Smooth
DEN UA /OV FINAL RWY 35R/TM 1718/FL060/TP B737/RM BASES 060
9m ago
Smooth
PUB UA /OV PUB260035/TM 1715/FL370/TP B738/RM MTW +/-10KT ZDVWC-30
12m ago
Smooth
LUG UA /OV LUG180010/TM 1712/FL035/TP DA40/SK SKC075/RM ZME 60
15m ago
Smooth
PGA UA /OV BCE111036/TM 1710/FL380/TP CL60/TB NEG/RM MTW +/-.02M +/-100FT ZDVWC
17m ago
AI-powered flight briefing
6,000 data points analyzed
· VERY HIGH confidence
Your Journey Beta
Your route takes you over the Sierra Nevada, over the Rocky Mountains, and over the Appalachian Mountains – these areas can sometimes cause turbulence.
Mostly Smooth
Overall conditions look mostly smooth with occasional light bumps. Nothing to worry about.
Takeoff
Takeoff should feel smooth with possible light bumps, with calm conditions around the airport.
Winds Aloft
Winds at cruising altitude are about 67 knots. These winds are favorable and may get you there up to 27 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 4h 16min
Maximum turbulence expected per segment
Takeoff
Light
0:20-0:47
Light
0:47-1:14
Light
1:14-1:41
Light
1:41-2:08
Light
2:08-2:35
Light
2:35-3:02
Light
3:02-3:29
Light
3:29-3:56
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 (30°)
Sky
Clear
Temperature
15°C
Conditions
VFR — Clear conditions, no delays expected
BNA
Nashville International — Arrival
Wind
6 kt (190°)
Sky
Scattered
Temperature
23°C
Conditions
VFR — Clear conditions, no delays expected
Your flight details
Departure timing and aircraft information
Afternoon Flight Departure
Time of day
Afternoon Flight
Tip
Afternoon flights may encounter more turbulence due to thermal activity as the sun heats the ground, creating rising air currents.
When
Today
boeing 737-824
Category
Narrow-Body Aircraft
Size
Medium
Comfort
Single-aisle mainline jets like this offer a comfortable ride. While you may feel turbulence more than on wide-body aircraft, they are engineered to handle it smoothly.
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.