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

Return flights

21 Aug - 18 Sep	SWISS
31 Aug - 11 Sep	Lufthansa
31 Aug - 04 Sep	Lufthansa
24 Aug - 04 Sep	Lufthansa
28 Aug - 04 Sep	SWISS
27 Aug - 04 Sep	SWISS
27 Aug - 09 Sep	SWISS
28 Aug - 09 Sep	SWISS
27 Aug - 03 Sep	SWISS
28 Aug - 03 Sep	LOT
07 Aug - 11 Aug	SWISS
21 Aug - 29 Aug	SWISS
18 Aug - 21 Aug	SWISS
21 Aug - 28 Aug	SWISS
23 Aug - 28 Aug	Lufthansa
06 Aug - 13 Aug	SWISS
21 Aug - 27 Aug	SWISS
06 Aug - 10 Aug	SWISS
23 Aug - 26 Aug	Lufthansa
07 Aug - 10 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 $244

Return flights