SQ21 Turbulence ForecastSingapore Airlines · EWR → SIN
About flight SQ21
The longest scheduled passenger flight in the world - Newark to Singapore, ~18.5 hours nonstop.
- Airline
- Singapore Airlines (SQ)
- Route
- EWR → SIN
- Typical Aircraft
- A359
- Distance
- 15,336 km
- Duration
- 18h 20m
- Cruise Altitude
- FL410
See today’s turbulence forecast
Singapore Airlines SQ21 flies the ultra-long-haul corridor from Newark to Singapore. Conditions change hour to hour - view the live forecast for your departure date.
View live forecastTurbulence on the EWR → SIN route
The route crosses mid-latitudes where the polar jet can influence flight conditions, though exposure is shorter than on genuine long-haul crossings. A large portion of the flight crosses open ocean (Indian Ocean), where upper-level conditions are generally smoother than over continental terrain.
Calmest season: Late spring to early autumn (May-September). Seasonal turbulence on this route is modest - most variation comes from day-to-day weather rather than strong seasonal cycles.
Full EWR to SIN route guideFrequently asked questions
Is SQ21 usually a bumpy flight?
Singapore Airlines SQ21 operates between EWR and SIN. Whether it’s bumpy depends on the day’s weather - Turbcast pulls live NOAA aviation-grade data so you can check the actual forecast for your departure date rather than relying on averages.
What aircraft does SQ21 use?
SQ21 is typically operated by the A359. Aircraft swaps happen - confirm with your booking before flying.
How long is the EWR to SIN flight?
Approximately 18h 20m direct, covering 15,336 km at a typical cruise of FL410.
When does SQ21 have the smoothest weather?
Historically calmest during Late spring to early autumn (May-September). Forecast accuracy improves as you get closer to departure - within 48 hours the NOAA WAFS model is at peak skill.