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

Return flights

17 Dec - 10 Jan	Hainan Airlines
26 Dec - 31 Dec	Hainan Airlines
21 Dec - 07 Jan	Hainan Airlines
20 Dec - 28 Dec	Hainan Airlines
29 Dec - 16 Jan	Etihad Airways
25 Dec - 26 Jan	KLM
11 Dec - 08 Jan	Etihad Airways
09 Dec - 13 Dec	Thai Lion Air
24 Dec - 02 Jan	Finnair
24 Dec - 01 Jan	Finnair
23 Dec - 01 Jan	Finnair
27 Dec - 03 Jan	Finnair
27 Dec - 02 Jan	Finnair
19 Dec - 31 Dec	Finnair
21 Dec - 30 Dec	Finnair
13 Dec - 27 Dec	Finnair
10 Dec - 22 Dec	Emirates
05 Dec - 16 Dec	Emirates
22 Dec - 28 Dec	Finnair
10 Dec - 21 Dec	Emirates

Also check the deals for one-way flights from Bangkok to Brussels 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 Bangkok to Brussels in December from $597

Return flights