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

Return flights

30 Aug - 06 Sep	Ryanair
21 Aug - 25 Aug	Ryanair
18 Aug - 26 Aug	SWISS
21 Aug - 23 Aug	Lufthansa
19 Aug - 24 Aug	Ryanair
16 Aug - 27 Aug	Ryanair
04 Aug - 08 Aug	Ryanair
17 Aug - 25 Aug	Ryanair
01 Aug - 10 Aug	Ryanair
10 Aug - 17 Aug	Ryanair

Also check the deals for one-way flights from Cagliari 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 Cagliari to Keflavik in August from 371€

Return flights