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

Return flights

02 Sep - 08 Sep	Scandinavian Airlines
23 Sep - 30 Sep	Scandinavian Airlines
08 Sep - 13 Sep	Scandinavian Airlines
04 Sep - 11 Sep	Scandinavian Airlines
28 Sep - 06 Oct	Scandinavian Airlines
18 Sep - 29 Sep	Ryanair
01 Sep - 26 Sep	Scandinavian Airlines
20 Sep - 01 Oct	Ryanair
05 Sep - 07 Sep	Ryanair
26 Sep - 28 Sep	Ryanair
10 Sep - 17 Sep	Ryanair
16 Sep - 20 Sep	Scandinavian Airlines
24 Sep - 01 Oct	Ryanair
24 Sep - 01 Oct	Icelandair	direct
20 Sep - 01 Oct	Icelandair	direct

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

Book a cheap hotel in Keflavik

Cheap car rent in Keflavik

Cheapest return flights from Brussels to Keflavik in September from $232

Return flights