Air Canada LHR YYC AC851
Air Canada · Live forecast
LHR → YYC
AC851 · Aug 17, 2026 · 10:15 BS
86
Calm Score
"A smooth ride ahead - sit back and enjoy."
8h 50m
Duration
3,787 nm
Distance
40,000 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 they don't put the aircraft in danger. Many passengers feel exactly the same way.
Right now on your route
Live pilot reports from aircraft flying LHR → YYC
5 pilot reports along this route
5 / 5
Reporting smooth
0 / 5
Light turbulence
0
Moderate or worse
Latest pilot reports
Smooth
ARP BAW86 6015N02149W 0747 F390 6000N02000W 0754 GOMUP MS50 213/59 KT GYMMS DDL VEY 170747 F39A
4m ago
Smooth
ARP ICE49C 5648N01238W 0746 F360 5651N01243W 0746 AGORI MS51 274/47 KT TFICV QXS BLY 170746 F08A
5m ago
Smooth
ARP ICE49C 5626N01157W 0741 F360 5651N01243W 0746 AGORI MS50 274/40 KT TFICV QXS BLY 170741 F06A
10m ago
Smooth
ARP UAE8ER 6153N02451W 0738 F340 6132N03001W 0757 6002N04002W MS49 205/60 KT A6EVK DDL KEF 170738 J37A
13m ago
Smooth
ARP ICE49C 5539N01034W 0732 F360 5651N01243W 0747 AGORI MS50 271/54 KT TFICV QXS BLY 170732 F02A
19m ago
AI-powered flight briefing
13,500 data points analyzed · HIGH confidence
Your Flight

We analysed more than 13,500 data points along your route from London Heathrow Airport, London to Calgary International Airport, Calgary.

Your Journey Beta

1 hour 20 minutes, 2 hours, and 2 hours 15 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 crossing the North Atlantic Ocean 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 possible light bumps, with calm conditions around the airport.

Winds Aloft

Winds at cruising altitude are about 49 knots. These winds may delay arrival by up to 45 minutes.

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
Live data from ECMWF global forecast models · 12 atmospheric pressure levels · Updated every 6 hours
Flight Timeline 8h 50min
Maximum turbulence expected per segment
Takeoff
Light
0:30-1:00
Light
1:00-1:30
Moderate
1:30-2:00
Light
2:00-2:30
Moderate
2:30-3:00
Light
3:00-3:30
Smooth
3:30-3:59
Light
3:59-4:28
Light
4:28-4:57
Smooth
4:57-5:26
Smooth
5:26-5:55
Light
5:55-6:24
Light
6:24-6:53
Light
6:53-7:22
Light
7:22-7:51
Light
7:51-8:20
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
LHR London Heathrow Airport - Departure
Wind
9 kt (280°)
Sky
Scattered
Temperature
19°C
Conditions
VFR - Clear conditions, no delays expected
YYC Calgary International Airport - Arrival
Visibility
10+ mi
Wind
3 kt (160°)
Sky
Clear
Temperature
15°C
Conditions
VFR - Clear conditions, no delays expected
Your flight details
Departure timing and aircraft information
Morning Flight Departure
Time of day
Morning Flight
Tip
Morning flights typically experience smoother conditions as the atmosphere is more stable and thermal turbulence hasn't yet developed.
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:

Disclaimer: This forecast is for informational purposes only. Always consult official aviation weather sources and follow ATC guidance.

Fly this route, calmly Game · Beta A calming mini-game, not a forecast. Glide LHR → YYC through soft clouds, nothing to crash into.