Your Flight
We analysed more than 14,500 data points along your route from Denver International Airport, Denver to London Heathrow Airport, London.
United Airlines
DEN
LHR
UA27
United Airlines · Live forecast
DEN
→
LHR
84
Calm Score
"A smooth ride ahead — sit back and enjoy."
9h 5m
Duration
4,048 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
Set an alert before your flight
Beta
You still have 23 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 DEN → LHR
11 pilot reports along this route
9 / 11
Reporting smooth
0 / 11
Light turbulence
2
Moderate or worse
Latest pilot reports
Smooth
ARP N215CL 5529N 01439W 0038 F400 M55 295/78 ETARI 0040 5600N 02000W KT N215CL DDL BLY 160038 L64A
11m ago
Smooth
DEN UA /OV DEN/TM 0026/FLDURGD/TP E75L/IC NEG
23m ago
Smooth
COS UA /OV BRK265051/TM 0023/FL240/TP B738/TB NEG/RM ZDVWC-26
26m ago
Smooth
ARP CMB588 5739N 01903W 0020 F400 M51 257/68 5800N 02000W 0025 6100N 03000W KT N846AX QXT IGW 160020 F11A
29m ago
Smooth
SNY UA /OV SNY170020/TM 0018/FL370/TP A320/TB NEG/RM ZDVWC-16
31m ago
AI-powered flight briefing
14,500 data points analyzed
· HIGH confidence
Your Journey Beta
8 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 Rocky 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 a bit bumpy initially, with calm conditions around the airport.
Winds Aloft
Winds at cruising altitude are about 58 knots. These winds are favorable and may get you there up to 39 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 9h 05min
Maximum turbulence expected per segment
Takeoff
Moderate
0:30-0:59
Light
0:59-1:28
Light
1:28-1:57
Light
1:57-2:26
Light
2:26-2:55
Light
2:55-3:24
Light
3:24-3:53
Light
3:53-4:22
Light
4:22-4:51
Light
4:51-5:19
Smooth
5:19-5:47
Smooth
5:47-6:15
Smooth
6:15-6:43
Smooth
6:43-7:11
Smooth
7:11-7:39
Light
7:39-8:07
Moderate
8:07-8:35
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
DEN
Denver International Airport — Departure
Visibility
0 mi
Wind
16 kt G26 (10°)
Sky
Broken
Temperature
-6°C
Conditions
LIFR — Very poor visibility, significant delays expected
LHR
London Heathrow Airport — Arrival
Wind
17 kt G27 (270°)
Sky
Unknown
Temperature
7°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
Tomorrow — conditions may change
b772
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.