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

Return flights

30 Aug - 10 Sep	Lufthansa
21 Aug - 23 Aug	SWISS
27 Aug - 03 Sep	SWISS
28 Aug - 02 Sep	Lufthansa
27 Aug - 31 Aug	SWISS
27 Aug - 04 Sep	SWISS
28 Aug - 09 Sep	SWISS
20 Aug - 23 Aug	SWISS
31 Aug - 04 Sep	Austrian Airlines
28 Aug - 03 Sep	Lufthansa
21 Aug - 29 Aug	SWISS
31 Aug - 04 Sep	Fly Play	direct
30 Aug - 03 Sep	Lufthansa
20 Aug - 03 Sep	SWISS
25 Aug - 29 Aug	SWISS
20 Aug - 28 Aug	SWISS
25 Aug - 31 Aug	Lufthansa
29 Aug - 31 Aug	Lufthansa
16 Aug - 19 Aug	Austrian Airlines
21 Aug - 27 Aug	SWISS

Also check the deals for one-way flights from Prague 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 Prague to Keflavik in August from 216€

Return flights