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

Return flights

13 Dec - 18 Dec	Lufthansa
02 Dec - 11 Dec	Scandinavian Airlines
18 Dec - 24 Dec	Lufthansa
15 Dec - 21 Dec	Ryanair
18 Dec - 24 Dec	Icelandair	direct
14 Dec - 19 Dec	Ryanair
05 Dec - 14 Dec	Icelandair	direct
30 Dec - 02 Jan	Scandinavian Airlines
19 Dec - 28 Dec	Icelandair	direct
19 Dec - 29 Dec	Ryanair
26 Dec - 04 Jan	Scandinavian Airlines
18 Dec - 27 Dec	Ryanair
20 Dec - 03 Jan	Ryanair
30 Dec - 02 Jan	Icelandair	direct
27 Dec - 04 Jan	Lufthansa

Also check the deals for one-way flights from Brussels to Keflavik 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 Keflavik in December from $205

Return flights