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South African Airways SA234 flies the tropical convective route from Johannesburg 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. At tropical latitudes, convective turbulence from thunderstorms is the main driver — pilots generally route around storm cells, but afternoon/evening flights encounter more build-up than morning departures. A large portion of the flight crosses open ocean (Mediterranean), 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 JNB to LHR route guideSouth African Airways SA234 operates between JNB 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.
SA234 is typically operated by the A346. Aircraft swaps happen — confirm with your booking before flying.
Approximately 11h 03m direct, covering 9,075 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.