Your Flight
We analysed more than 8,500 data points along your route from Seattle–Tacoma International Airport, Seattle to Ellison Onizuka Kona International Airport at Keahole, Kailua-Kona.
Delta Air Lines
SEA
KOA
DL340
Delta Air Lines · Live forecast
SEA
→
KOA
80
Calm Score
"A smooth ride ahead — sit back and enjoy."
4h 22m
Duration
2,336 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 you'll be completely safe. 1 in 3 passengers feel exactly like you.
Right now on your route
Live pilot reports from aircraft flying SEA → KOA
6 pilot reports along this route
2 / 6
Reporting smooth
1 / 6
Light turbulence
3
Moderate or worse
Latest pilot reports
Smooth
SEA UA /OV SEA190020/TM 1750/FL060/TP A332/TB LGT-MOD 060-170/RM HAROB ZSE
6m ago
Smooth
PAE UA /OV PAE340022/TM 1750/FL200/TP E75L/TA M14/IC LGT RIME 220-200/RM DURD ZSE
6m ago
Light
BFI UA /OV BFI315002/TM 1746/FL009/TP PC12/TB CNTS LGT
10m ago
Moderate
SEA UA /OV SEA200015/TM 1746/FL060/TP F900/TB MOD 060-180/RM DURC
10m ago
Smooth
PAE UA /OV KPAE/TM 1735/FL012/TP C172/SK FEW012/RM 1 S OF PAE
21m ago
AI-powered flight briefing
8,500 data points analyzed
· HIGH confidence
Your Journey Beta
21 minutes, 1 hour, and 2 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 crossing the North Pacific Ocean – conditions there 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 70 knots. These winds may delay arrival by up to 39 minutes.
Landing
Landing should feel smooth 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 4h 22min
Maximum turbulence expected per segment
Takeoff
Moderate
0:20-0:48
Moderate
0:48-1:16
Moderate
1:16-1:44
Light
1:44-2:12
Moderate
2:12-2:40
Moderate
2:40-3:08
Light
3:08-3:35
Moderate
3:35-4:02
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
SEA
Seattle–Tacoma International Airport — Departure
Wind
10 kt (210°)
Sky
Overcast
Temperature
7°C
Conditions
VFR — Clear conditions, no delays expected
KOA
Ellison Onizuka Kona International Airport at Keahole — Arrival
Wind
16 kt (210°)
Sky
Overcast
Temperature
25°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
boeing 757-26d
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.