Your Flight
We analysed more than 13,000 data points along your route from John F Kennedy International Airport, New York to Václav Havel Airport Prague, Prague.
Delta Air Lines
JFK
PRG
DL78
Delta Air Lines · Live forecast
JFK
→
PRG
88
Calm Score
"A smooth ride ahead — sit back and enjoy."
8h 20m
Duration
3,537 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 20 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 JFK → PRG
15 pilot reports along this route
15 / 15
Reporting smooth
0 / 15
Light turbulence
0
Moderate or worse
Latest pilot reports
Smooth
ARP BAW11J 5102N04530W 0147 F400 5200N04000W 0211 5300N03000W MS51 198/78 KT GVIIA DDL XXH 170147 F57A
5m ago
Smooth
ARP SAS916 5222N05010W 0146 F380 5230N05000W 0147 5659N03959W MS42 189/60 KT LNRKR DDL YAY 170146 J34A
6m ago
Smooth
ARP GTI8825 5421N03722W 0146 F360 5400N04000W 0159 5400N05000W MS49 243/29 KT N429MC DDL XXN 170146 F82A
6m ago
Smooth
ARP DAL106 5059N04532W 0145 F370 5158N03959W 0210 5258N03000W MS50 205/96 KT N852NW DDL IG1 170145 J53A
7m ago
Smooth
ARP EIN104 5345N02317W 0145 F390 5359N02000W 0200 DOGAL MS59 307/20 KT EIDUZ DDL XXN 170145 J98A
7m ago
AI-powered flight briefing
13,000 data points analyzed
· HIGH confidence
Your Journey Beta
4 hours and 5 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 Appalachian 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 smooth with possible light bumps, with calm conditions around the airport.
Winds Aloft
Winds at cruising altitude are about 40 knots. These winds are favorable and may get you there up to 21 minutes early.
Landing
Landing should feel a bit bumpy on descent 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 8h 20min
Maximum turbulence expected per segment
Takeoff
Light
0:30-1:00
Light
1:00-1:30
Light
1:30-2:00
Light
2:00-2:30
Smooth
2:30-3:00
Light
3:00-3:29
Light
3:29-3:58
Light
3:58-4:27
Moderate
4:27-4:56
Moderate
4:56-5:25
Light
5:25-5:54
Smooth
5:54-6:23
Smooth
6:23-6:52
Smooth
6:52-7:21
Light
7:21-7:50
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
JFK
John F Kennedy International Airport — Departure
Visibility
2 mi
Wind
11 kt (210°)
Sky
Scattered
Temperature
29°C
Conditions
IFR — Low visibility, delays likely
PRG
Václav Havel Airport Prague — Arrival
Wind
5 kt (80°)
Sky
NSC
Temperature
21°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
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:
- 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.