Vols London (LHR) – Hong Kong (HKG)

London Heathrow to Hong Kong is the eastbound leg of the 9,680 km corridor, with the same two carriers (Cathay, BA) and 41 weekly departures. Block time runs 11 hours 30 minutes to 12 hours 15 minutes — the polar route Cathay favours has a tailwind component crossing Siberia in winter that can shave 30+ minutes off the schedule.

Departures cluster in late morning (Cathay CX252 at ~11:30 from LHR T3) and late evening (the BA31 at ~21:00 from T5). The morning departure is the smart choice for jet-lag-sensitive travellers — you arrive HKG the following morning around 07:00 local, with the full day to push through to local bedtime. The evening departure lands HKG late-evening on day +1, which is harder on the body but works if you want to skip the airport-day exhaustion and go straight to sleep at the hotel.

The 7-hour eastward time gap (London at UTC+0/+1, Hong Kong at UTC+8) is the harder direction for jet lag. Daylight in Hong Kong on arrival day is non-negotiable: book a hotel near Tsim Sha Tsui waterfront, walk the promenade, do not nap. Asian rhythm latches faster than European westbound returns.