LHR
London Heathrow Airport
✈
SEA
Seattle–Tacoma International Airport
Distance
4,159 nm
Altitude
40,000 ft
Est. Duration
9h 35m
Route Information
Departure

LHR (LHR)

Distance

7,702.2 km (4,158.9 nautical miles)

Arrival

SEA (SEA)

Flight Time

585 minutes (9h 45m)

Flight Profile

Cruise Altitude: 40,000 ft (Flight Level 400)

Route calculated using great circle navigation

Turbulence comfort along route
Comfort score combines turbulence probability with intensity, higher means rougher
Smooth Light Moderate Severe
Your flight, stretch by stretch
Some bumps expected. 5 bumpier stretches, about 411 min in total.
  • 0:00-1:00 · Takeoff · moderate bumps (~60 min) Noticeable bumps. The seatbelt sign is likely on.
  • 1:00-2:29 · light bumps (~89 min) Light movement. Drinks may ripple.
  • 2:29-3:27 · smooth
  • 3:27-4:54 · light bumps (~87 min) Light movement. Drinks may ripple.
  • 4:54-6:21 · smooth
  • 6:21-7:48 · light bumps (~87 min) Light movement. Drinks may ripple.
  • 7:48-8:17 · smooth
  • 8:17-9:45 · Landing · light bumps (~88 min) Light movement. Drinks may ripple.
💙
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 → SEA
15 pilot reports along this route
15 / 15
Reporting smooth
0 / 15
Light turbulence
0
Moderate or worse
Latest pilot reports
Smooth
ARP ACA801 5649N01241W 0945 F380 AGORI 0947 5931N01959W MS44 350/90 KT CFRSA DDL SYY 150945 L14A
3m ago
Smooth
ARP DAL161 5714N01058W 0940 F360 5900N02000W 1020 5900N03000W MS46 228/98 KT N512DN DDL TRE 150940 J82A
8m ago
Smooth
ARP THY3 5718N01108W 0940 F340 5901N02000W 1021 5931N03000W MS44 230/92 KT TCJJO QXS BRR 150941 F17A
8m ago
Smooth
ARP ACA801 5617N01148W 0939 F380 AGORI 0947 5931N01959W MS45 356/98 KT CFRSA DDL SYY 150939 L13A
9m ago
Smooth
ARP UAL37 5819N01117W 0935 F340 6000N02000W 1015 6000N03000W MS43 229/82 KT N41140 DDL TRE 150935 F64A
13m ago
AI-powered flight briefing
15,000 data points analyzed · HIGH confidence
Your Flight

We analysed more than 15,000 data points along your route from London Heathrow Airport, London to Seattle–Tacoma International Airport, Seattle.

Your Journey Beta

26 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 Scottish Highlands, crossing the North Atlantic Ocean, and over the Rocky Mountains – these areas can sometimes cause 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 52 knots. These winds may delay arrival by up to 22 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 9h 45min
Maximum turbulence expected per segment
Takeoff
Moderate
0:30-1:00
Moderate
1:00-1:30
Light
1:30-2:00
Light
2:00-2:29
Light
2:29-2:58
Smooth
2:58-3:27
Smooth
3:27-3:56
Light
3:56-4:25
Light
4:25-4:54
Light
4:54-5:23
Smooth
5:23-5:52
Smooth
5:52-6:21
Smooth
6:21-6:50
Light
6:50-7:19
Light
7:19-7:48
Light
7:48-8:17
Smooth
8:17-8:46
Light
8:46-9:15
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
8 kt (190°)
Sky
Few
Temperature
19°C
Conditions
MVFR - Reduced visibility, minor delays possible
SEA Seattle–Tacoma International Airport - Arrival
Visibility
0 mi
Wind
7 kt (20°)
Sky
Broken
Temperature
11°C
Conditions
LIFR - Very poor visibility, significant delays expected
Your flight details
Departure timing and aircraft information
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. Glide LHR → SEA, with soft clouds where today's forecast shows bumpier air. Nothing to crash into.