AirHint found the following cheapest return flights from London (LHR) to Bangkok (BKK) in December 2025 (see full year).

Return flights

31 Dec - 25 Jan	Shenzhen Airlines
31 Dec - 29 Jan	Shenzhen Airlines
31 Dec - 27 Jan	SWISS
31 Dec - 18 Jan	Shenzhen Airlines
30 Dec - 22 Jan	KM Malta Airlines
30 Dec - 21 Jan	Air China
30 Dec - 20 Jan	KM Malta Airlines
30 Dec - 27 Jan	Turkish Airlines
29 Dec - 22 Jan	China Eastern
31 Dec - 23 Jan	China Eastern
29 Dec - 31 Dec	Turkish Airlines
28 Dec - 30 Dec	LOT
29 Dec - 30 Dec	KLM
27 Dec - 28 Dec	LOT
27 Dec - 31 Dec	Air China
28 Dec - 29 Dec	Gulf Air
27 Dec - 29 Dec	China Eastern
27 Dec - 30 Dec	Gulf Air
28 Dec - 31 Dec	Cathay Pacific
28 Dec - 30 Dec	EVA Air	direct

Also check the deals for one-way flights from London to Bangkok 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 Bangkok in December from 586€

Return flights