Eastar Jet ICN CTS ZE621
Eastar Jet · Live forecast
ICN → CTS
ZE621 · Mar 16, 2026 · 07:40 KS · boeing 737 max 8
74
Calm Score
"Mostly smooth — one short bumpy section you'll handle."
11h 40m
Duration
767 nm
Distance
31,000 ft
Cruise Altitude
HIGH
Confidence
Turbulence comfort along route
Comfort score combines turbulence probability with intensity — higher means rougher
Smooth Light Moderate Severe

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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.
AI-powered flight briefing
3,000 data points analyzed · HIGH confidence
Your Flight

We analysed more than 3,000 data points along your route from Incheon International Airport, Seoul to New Chitose Airport, Sapporo.

Your Journey Beta

Some bumpy patches are scattered throughout the flight. Keep your seatbelt fastened when seated.

Your route takes you crossing the Sea of Japan – conditions there can sometimes cause light turbulence.

Mostly Smooth

Overall conditions look mostly smooth with occasional light bumps. Nothing to worry about.

Takeoff

Takeoff should feel smooth with possible light bumps, with calm conditions around the airport.

Winds Aloft

Winds at cruising altitude are about 79 knots. These winds are favorable and may get you there up to 13 minutes early.

Landing

Landing should feel expect some bumps on approach 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 11h 40min
Maximum turbulence expected per segment
Takeoff
Light
0:30-1:00
Light
1:00-1:30
Light
1:30-1:59
Light
1:59-2:28
Light
2:28-2:57
Severe
2:57-3:26
Moderate
3:26-3:55
Light
3:55-4:24
Light
4:24-4:53
Moderate
4:53-5:22
Light
5:22-5:51
Light
5:51-6:20
Light
6:20-6:49
Light
6:49-7:18
Light
7:18-7:47
Smooth
7:47-8:16
Smooth
8:16-8:45
Light
8:45-9:14
Light
9:14-9:43
Light
9:43-10:12
Light
10:12-10:41
Smooth
10:41-11:10
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
ICN Incheon International Airport — Departure
Visibility
3 mi
Wind
6 kt (130°)
Sky
Broken
Temperature
5°C
Conditions
MVFR — Reduced visibility, minor delays possible
CTS New Chitose Airport — Arrival
Wind
8 kt (300°)
Sky
Broken
Temperature
4°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.
boeing 737 max 8
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:

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