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

Return flights

05 Dec - 09 Dec	Wizz Air
05 Dec - 11 Dec	Wizz Air
30 Dec - 09 Jan	easyJet
04 Dec - 08 Dec	Wizz Air
04 Dec - 07 Dec	Wizz Air
07 Dec - 11 Dec	Scandinavian Airlines
08 Dec - 12 Dec	Wizz Air
05 Dec - 08 Dec	Wizz Air
24 Dec - 08 Jan	KLM
24 Dec - 01 Jan	SWISS
24 Dec - 02 Jan	SWISS
07 Dec - 11 Dec	Icelandair	direct
14 Dec - 01 Jan	Scandinavian Airlines
16 Dec - 03 Jan	easyJet
23 Dec - 07 Jan	easyJet
24 Dec - 08 Jan	Icelandair	direct
14 Dec - 01 Jan	Icelandair	direct
24 Dec - 01 Jan	Icelandair	direct
21 Dec - 28 Dec	TUI
04 Dec - 07 Dec	Icelandair	direct

Also check the deals for one-way flights from Keflavik 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 Keflavik to Brussels in December from $229

Return flights