A couple of weeks ago I flew from Manchester (UK) to Hong Kong, this took ~12.5 hours. Yesterday I flew back from Hong Kong to London, this took ~14.25 hours. Manchester and London are relatively close in this context, and if anything I would think London is slightly closer to Hong Kong. Looking at the flight map on the screen on the plane, the routes seemed broadly similar. Why did flying back take nearly two hours more?
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At high altitudes (where commercial planes tend to fly), there is a general prevailing wind blowing from the west to the east. (due to earth’s rotation). So east bound flights tend to be shorter and westbound flights longer in duration. This is very apparent for long distance flights.
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