Your Flight
We analysed more than 8,000 data points along your route from Logan International, Boston to Los Angeles International Airport, Los Angeles.
United Airlines
BOS
LAX
UA639
United Airlines · Live forecast
BOS
→
LAX
79
Calm Score
"Mostly smooth — one short bumpy section you'll handle."
6h 46m
Duration
2,263 nm
Distance
40,000 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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Beta
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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 BOS → LAX
15 pilot reports along this route
11 / 15
Reporting smooth
4 / 15
Light turbulence
0
Moderate or worse
Latest pilot reports
Smooth
PWK UA /OV PWK/TM 1235/FL030/TP ASTR/SK OVC030-TOPUNKN
8m ago
Smooth
TOL UA /OV 7 SW DFI/TM 1234/FLDURD/TP C340/SK B030
9m ago
Light
ORD UA /OV ORD360005/TM 1234/FLDURC/TP B739/TB LGT CHOP/IC NEG
9m ago
Smooth
ORD UA /OV ORD/TM 1233/FLSFC/TP B787/RM BRAKING ACTION GOOD RWY 27C
10m ago
Smooth
PWM UA /OV PWM/TM 1232/FL000/TP BCS3/SK BS 005 /WX 2/WV 149 44 KTS AT 020/RM MOD PRECIP
11m ago
AI-powered flight briefing
8,000 data points analyzed
· VERY HIGH confidence
Your Journey Beta
2 hours 20 minutes, 3 hours, and 4 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 over the Appalachian Mountains, over the Rocky Mountains, and over the Sierra Nevada – 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 81 knots. These winds may delay arrival by a few minutes.
Landing
Landing should feel a bit bumpy on descent 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 46min
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
Moderate
3:24-3:53
Light
3:53-4:22
Light
4:22-4:51
Moderate
4:51-5:20
Light
5:20-5:48
Light
5:48-6:16
Light
Landing
Moderate
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
BOS
Logan International — Departure
Visibility
2 mi
Wind
14 kt G25 (160°)
Sky
Overcast
Temperature
7°C
Conditions
IFR — Low visibility, delays likely
LAX
Los Angeles International Airport — Arrival
Visibility
4 mi
Wind
6 kt (260°)
Sky
Scattered
Temperature
14°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
a321
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.