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

Return flights

30 Aug - 20 Sep	Fly Play
31 Aug - 20 Sep	Transavia France
02 Aug - 26 Aug	Lufthansa
02 Aug - 25 Aug	Lufthansa
03 Aug - 24 Aug	Lufthansa
01 Aug - 26 Aug	Austrian Airlines
08 Aug - 19 Aug	Wizz Air Malta
01 Aug - 23 Aug	Austrian Airlines
07 Aug - 13 Aug	Wizz Air
06 Aug - 11 Aug	Wizz Air
07 Aug - 11 Aug	Wizz Air
06 Aug - 12 Aug	Wizz Air

Also check the deals for one-way flights from Keflavik to Belgrade in August.

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 Belgrade in August from $339

Return flights