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The longest scheduled passenger flight in the world — Newark to Singapore, ~18.5 hours nonstop.
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 forecastThe 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 and early autumn. 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 guideSingapore 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.
SQ21 is typically operated by the A359. Aircraft swaps happen — confirm with your booking before flying.
Approximately 18h 20m direct, covering 15,336 km at a typical cruise of FL410.
Historically calmest during Late spring and early autumn. Forecast accuracy improves as you get closer to departure — within 48 hours the NOAA WAFS model is at peak skill.