AirHint found the following cheapest return flights from London (LCY) to Hanoi (HAN) in December 2025 (see full year).

Return flights

04 Dec - 07 Dec	SWISS
10 Dec - 15 Dec	Lufthansa
03 Dec - 14 Dec	British Airways
04 Dec - 17 Dec	British Airways
03 Dec - 08 Dec	British Airways
05 Dec - 10 Dec	British Airways
08 Dec - 14 Dec	British Airways
03 Dec - 07 Dec	British Airways
30 Dec - 19 Jan	KLM
04 Dec - 16 Dec	British Airways
05 Dec - 12 Dec	British Airways
30 Dec - 20 Jan	British Airways
31 Dec - 21 Jan	British Airways
31 Dec - 15 Jan	British Airways
11 Dec - 15 Jan	ITA Airways
31 Dec - 19 Jan	British Airways
11 Dec - 14 Jan	British Airways
29 Dec - 15 Jan	British Airways
29 Dec - 22 Jan	British Airways
31 Dec - 07 Jan	KLM

Also check the deals for one-way flights from London to Hanoi in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from London to Hanoi in December from 791€

Return flights