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

Return flights

19 Aug - 26 Aug	Ryanair
02 Aug - 12 Aug	Ryanair
06 Aug - 12 Aug	Lufthansa
24 Aug - 31 Aug	LOT
23 Aug - 28 Aug	Lufthansa
21 Aug - 25 Aug	LOT
03 Aug - 10 Aug	LOT
03 Aug - 15 Aug	LOT
21 Aug - 28 Aug	Ryanair
18 Aug - 23 Aug	Ryanair

Also check the deals for one-way flights from Zagreb to Keflavik 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 Zagreb to Keflavik in August from 270€

Return flights