How long is flight TG911?

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

Flight TG911

TG911 Turbulence ForecastThai Airways · BKK → LHR

About flight TG911

Airline: Thai Airways (TG)
Route: BKK → LHR
Typical Aircraft: A359
Distance: 9,578 km
Duration: 11h 38m
Cruise Altitude: FL410

See today’s turbulence forecast

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 forecast

Check TG911 on a specific date

Turbulence on the BKK → LHR 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 Himalayas, Tien Shan / Pamirs, which can generate mountain-wave turbulence downwind when upper-level winds are strong.

Calmest season: Late spring to early autumn (May-September). Wind flowing over the Himalayas 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 BKK to LHR route guide

Frequently asked questions

Is TG911 usually a bumpy flight?

Thai 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.

What aircraft does TG911 use?

TG911 is typically operated by the A359. Aircraft swaps happen - confirm with your booking before flying.

How long is the BKK to LHR flight?

Approximately 11h 38m direct, covering 9,578 km at a typical cruise of FL410.

When does TG911 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.