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Thai Airways TG911 flies the mountain-wave sensitive route from Bangkok to London. 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 Himalayas, Tien Shan / Pamirs, which can generate mountain-wave turbulence downwind when upper-level winds are strong.
Calmest season: Late spring and early autumn. Wind flowing over Himalayas can generate mountain-wave turbulence that extends hundreds of kilometres downwind — most pronounced in winter when upper-level winds are strongest.
Full BKK to LHR route guideThai Airways TG911 operates between BKK and LHR. 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.
TG911 is typically operated by the A359. Aircraft swaps happen — confirm with your booking before flying.
Approximately 11h 38m direct, covering 9,578 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.