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

Return flights

02 Sep - 06 Sep	Fly Play	direct
08 Sep - 17 Sep	KLM
25 Sep - 30 Sep	Wizz Air
26 Sep - 01 Oct	Scandinavian Airlines
28 Sep - 05 Oct	Wizz Air
10 Sep - 12 Sep	Fly Play
19 Sep - 21 Sep	Scandinavian Airlines
23 Sep - 23 Sep	Scandinavian Airlines
19 Sep - 21 Sep	Icelandair	direct
26 Sep - 01 Oct	Icelandair	direct
08 Sep - 17 Sep	Icelandair	direct
24 Sep - 24 Sep	Scandinavian Airlines
10 Sep - 12 Sep	Icelandair	direct

Also check the deals for one-way flights from Keflavik to Brussels in September.

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 September from 170€

Return flights