AirHint found the following cheapest return flights from London (LHR) to Bangkok (BKK) in December 2026 (see full year).

Return flights

06 Dec - 19 Dec	Iberia
10 Dec - 15 Dec	Iberia
13 Dec - 22 Dec	Iberia
03 Dec - 25 Dec	ITA Airways
04 Dec - 25 Dec	ITA Airways
04 Dec - 27 Dec	ITA Airways
04 Dec - 26 Dec	ITA Airways
04 Dec - 29 Dec	ITA Airways
04 Dec - 28 Dec	ITA Airways
04 Dec - 14 Dec	ITA Airways
04 Dec - 12 Jan	ITA Airways
10 Dec - 09 Jan	Iberia
04 Dec - 07 Jan	KLM
01 Dec - 12 Jan	Saudia
30 Dec - 07 Jan	Saudia
02 Dec - 05 Jan	Saudia
30 Dec - 05 Jan	Saudia
29 Dec - 09 Jan	Saudia
31 Dec - 09 Jan	Saudia
29 Dec - 07 Jan	Saudia

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 571€

Return flights