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

Return flights

31 Aug - 08 Sep	Lufthansa
23 Aug - 27 Aug	Lufthansa
29 Aug - 03 Sep	Scandinavian Airlines
07 Aug - 12 Aug	SWISS
20 Aug - 27 Aug	SWISS
21 Aug - 27 Aug	SWISS
06 Aug - 09 Aug	Ryanair
31 Aug - 14 Sep	Lufthansa
07 Aug - 18 Aug	SWISS
23 Aug - 28 Aug	Lufthansa
07 Aug - 14 Aug	SWISS
20 Aug - 28 Aug	SWISS
06 Aug - 13 Aug	Ryanair
27 Aug - 03 Sep	Ryanair
27 Aug - 06 Sep	SWISS
28 Aug - 07 Sep	Fly Play	direct
31 Aug - 14 Sep	Fly Play	direct
31 Aug - 05 Sep	Transavia France
28 Aug - 02 Sep	SWISS
25 Aug - 03 Sep	Ryanair

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 203€

Return flights