How long is flight SQ12?

The SIN to LAX route is the basis for the schedule. View the full route forecast and typical duration on the Turbcast route page.

Flight SQ12

SQ12 Turbulence ForecastSingapore Airlines · SIN → LAX

About flight SQ12

Airline: Singapore Airlines (SQ)
Route: SIN → LAX
Typical Aircraft: A359
Distance: 14,102 km
Duration: 16h 54m
Cruise Altitude: FL410

See today’s turbulence forecast

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 forecast

Check SQ12 on a specific date

Turbulence on the SIN → LAX route

The 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 to early autumn (May-September). This corridor is most turbulent in the northern winter (Nov-Mar), when the jet stream is strongest and sits closer to the route. Wind flowing over the Rocky Mountains can generate mountain-wave turbulence that extends hundreds of kilometres downwind - most pronounced in the northern winter (Nov-Mar), when upper-level winds are strongest.

Full SIN to LAX route guide

Frequently asked questions

Is SQ12 usually a bumpy flight?

Singapore 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.

What aircraft does SQ12 use?

SQ12 is typically operated by the A359. Aircraft swaps happen - confirm with your booking before flying.

How long is the SIN to LAX flight?

Approximately 16h 54m direct, covering 14,102 km at a typical cruise of FL410.

When does SQ12 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.