Your Flight
We analysed more than 15,000 data points along your route from Washington Dulles International Airport, Dulles to Guarulhos - Governador André Franco Montoro International Airport, São Paulo.
United Airlines
IAD
GRU
UA861
United Airlines · Live forecast
IAD
→
GRU
91
Calm Score
"A smooth ride ahead — sit back and enjoy."
13h 50m
Duration
4,130 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
Your flight departs in less than 6 hours. The forecast is unlikely to change significantly at this point.
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 IAD → GRU
8 pilot reports along this route
8 / 8
Reporting smooth
0 / 8
Light turbulence
0
Moderate or worse
Latest pilot reports
Smooth
BWI UA /OV METAR/TM 2310/FL035/TP B738/RM BASES 3500
9m ago
Smooth
IAD UA /OV IAD/TM 2305/FLDURC/TP B788/SK BKN030-066
14m ago
Smooth
PTW UA /OV MXE/TM 2255/FL140/TP E75L/TA M07/IC LGT RIME
24m ago
Smooth
ADW UA /OV RWY 19R ARR/TM 2254/FL030/TP GLF5/SK BASES OVC040
25m ago
Smooth
BWI UA /OV BAL10003/TM 2252/FL140/TP GLF4/TA M09/IC LT RIME
27m ago
AI-powered flight briefing
15,000 data points analyzed
· HIGH confidence
Your Journey Beta
1 hour 35 minutes and 2 hours 30 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 and crossing the North Atlantic Ocean – 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 possible light bumps, with calm conditions around the airport.
Winds Aloft
Winds at cruising altitude are about 37 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 13h 50min
Maximum turbulence expected per segment
Takeoff
Light
0:30-1:00
Light
1:00-1:30
Light
1:30-2:00
Moderate
2:00-2:30
Light
2:30-3:00
Moderate
3:00-3:30
Smooth
3:30-4:00
Light
4:00-4:30
Light
4:30-5:00
Smooth
5:00-5:30
Light
5:30-6:00
Light
6:00-6:30
Light
6:30-7:00
Light
7:00-7:30
Smooth
7:30-8:00
Light
8:00-8:30
Light
8:30-8:59
Smooth
8:59-9:28
Light
9:28-9:57
Smooth
9:57-10:26
Smooth
10:26-10:55
Smooth
10:55-11:24
Smooth
11:24-11:53
Smooth
11:53-12:22
Light
12:22-12:51
Light
12:51-13:20
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
IAD
Washington Dulles International Airport — Departure
Wind
14 kt G25 (130°)
Sky
Overcast
Temperature
13°C
Conditions
MVFR — Reduced visibility, minor delays possible
GRU
Guarulhos - Governador André Franco Montoro International Airport — Arrival
Wind
5 kt (70°)
Sky
NSC
Temperature
24°C
Conditions
VFR — Clear conditions, no delays expected
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
b764
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.