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

Return flights

12 Dec - 16 Dec	Wizz Air UK
06 Dec - 16 Dec	Pegasus Airlines
03 Dec - 16 Dec	Wizz Air UK
03 Dec - 24 Dec	Wizz Air UK
05 Dec - 24 Dec	Wizz Air UK
05 Dec - 16 Dec	Wizz Air UK
09 Dec - 16 Dec	easyJet
07 Dec - 16 Dec	Pegasus Airlines
06 Dec - 24 Dec	Pegasus Airlines
05 Dec - 27 Dec	Air China
05 Dec - 19 Jan	Air China
05 Dec - 31 Jan	Air China
05 Dec - 18 Jan	Air China
02 Dec - 30 Jan	Air China
01 Dec - 28 Jan	Air China
01 Dec - 24 Jan	Air China
01 Dec - 29 Jan	Air China
07 Dec - 16 Jan	Air China
02 Dec - 19 Jan	Air China
01 Dec - 26 Jan	Air China

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 $498

Return flights