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

Return flights

05 Dec - 10 Dec	Ryanair
03 Dec - 06 Dec	Ryanair
05 Dec - 11 Dec	Lufthansa
06 Dec - 08 Dec	Ryanair
03 Dec - 07 Dec	Ryanair
04 Dec - 11 Dec	Lufthansa
13 Dec - 17 Dec	Ryanair
07 Dec - 12 Dec	Ryanair
06 Dec - 10 Dec	Ryanair
09 Dec - 12 Dec	Ryanair
31 Dec - 08 Jan	LOT
12 Dec - 01 Jan	easyJet
12 Dec - 01 Jan	Icelandair	direct
18 Dec - 01 Jan	Icelandair	direct
31 Dec - 04 Jan	Ryanair
21 Dec - 01 Jan	Ryanair
30 Dec - 04 Jan	Ryanair
24 Dec - 01 Jan	Ryanair
20 Dec - 01 Jan	Ryanair
24 Dec - 01 Jan	Icelandair	direct

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 200€

Return flights