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

Return flights

18 Sep - 30 Sep	Air Serbia
25 Sep - 30 Sep	Wizz Air
25 Sep - 01 Oct	Wizz Air
25 Sep - 06 Oct	Air Serbia
18 Sep - 23 Sep	Wizz Air
26 Sep - 01 Oct	Wizz Air
23 Sep - 01 Oct	Air Serbia
25 Sep - 28 Sep	Air Serbia
23 Sep - 28 Sep	Wizz Air UK
25 Sep - 04 Oct	Wizz Air
20 Sep - 27 Sep	Air Serbia
22 Sep - 27 Sep	Air Serbia
12 Sep - 14 Sep	Wizz Air
21 Sep - 27 Sep	easyJet

Also check the deals for one-way flights from Belgrade 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.

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Cheapest return flights from Belgrade to Keflavik in September from 243€

Return flights