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Singapore Airlines SQ12 flies the mountain-wave sensitive route from Singapore to Los Angeles. 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. The route crosses or passes near the Rocky Mountains, which can generate mountain-wave turbulence downwind when upper-level winds are strong.
Calmest season: Late spring and early autumn. Transpacific routes are most turbulent in winter months when the polar jet is strong and positioned further south. Wind flowing over Rocky Mountains can generate mountain-wave turbulence that extends hundreds of kilometres downwind — most pronounced in winter when upper-level winds are strongest.
Full SIN to LAX route guideSingapore Airlines SQ12 operates between SIN and LAX. 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.
SQ12 is typically operated by the A359. Aircraft swaps happen — confirm with your booking before flying.
Approximately 16h 54m direct, covering 14,102 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.