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

Return flights

07 Dec - 24 Dec	Wizz Air UK
10 Dec - 08 Jan	Wizz Air UK
15 Dec - 31 Jan	Ryanair
10 Dec - 10 Jan	Wizz Air UK
21 Dec - 14 Jan	Air Serbia
25 Dec - 26 Jan	Air China
26 Dec - 26 Jan	Air China
27 Dec - 05 Jan	Shenzhen Airlines
24 Dec - 07 Jan	Shenzhen Airlines
12 Dec - 24 Dec	Shenzhen Airlines

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 $691

Return flights