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

Return flights

07 Dec - 09 Dec	Ryanair
21 Dec - 28 Dec	Ryanair
07 Dec - 13 Dec	Ryanair
03 Dec - 07 Dec	Ryanair
05 Dec - 07 Dec	Ryanair
04 Dec - 13 Dec	Ryanair
13 Dec - 15 Dec	Ryanair
10 Dec - 17 Dec	Ryanair
05 Dec - 11 Dec	Ryanair
20 Dec - 23 Dec	Ryanair
24 Dec - 01 Jan	Ryanair
28 Dec - 01 Jan	Ryanair
18 Dec - 02 Jan	Ryanair
18 Dec - 02 Jan	Icelandair	direct
24 Dec - 01 Jan	Icelandair	direct
28 Dec - 04 Jan	Ryanair
21 Dec - 03 Jan	Ryanair
19 Dec - 03 Jan	Scandinavian Airlines
30 Dec - 04 Jan	Icelandair	direct
27 Dec - 03 Jan	Scandinavian Airlines

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 $188

Return flights