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

Return flights

02 Dec - 09 Dec	Pegasus Airlines
07 Dec - 17 Dec	Lufthansa
09 Dec - 20 Dec	Pegasus Airlines
02 Dec - 13 Dec	Pegasus Airlines
02 Dec - 07 Jan	Pegasus Airlines
09 Dec - 07 Jan	Pegasus Airlines
08 Dec - 17 Dec	SWISS
15 Dec - 21 Dec	Ryanair
01 Dec - 31 Dec	Lufthansa
01 Dec - 21 Dec	Lufthansa
01 Dec - 27 Dec	Lufthansa
01 Dec - 20 Dec	Lufthansa
09 Dec - 20 Jan	Etihad Airways
11 Dec - 12 Jan	Etihad Airways
07 Dec - 26 Jan	Etihad Airways
01 Dec - 30 Jan	Finnair
30 Dec - 17 Jan	Etihad Airways
09 Dec - 21 Jan	Lufthansa
06 Dec - 24 Jan	Austrian Airlines
25 Dec - 10 Jan	Hainan Airlines

Also check the deals for one-way flights from Brussels 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 Brussels to Bangkok in December from 504€

Return flights