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

Return flights

28 Aug - 04 Sep	Norwegian Air Sweden AOC
28 Aug - 02 Sep	Lufthansa
28 Aug - 31 Aug	Lufthansa
26 Aug - 28 Aug	Lufthansa
27 Aug - 01 Sep	Scandinavian Airlines
28 Aug - 02 Sep	Finnair	direct
29 Aug - 02 Sep	Scandinavian Airlines
27 Aug - 29 Aug	Scandinavian Airlines
25 Aug - 27 Aug	Ryanair
22 Aug - 24 Aug	Finnair
30 Aug - 07 Sep	airBaltic
29 Aug - 02 Sep	Finnair	direct
26 Aug - 28 Aug	Finnair	direct
23 Aug - 30 Aug	Lufthansa
23 Aug - 31 Aug	Scandinavian Airlines
21 Aug - 28 Aug	Finnair	direct
24 Aug - 26 Aug	Lufthansa

Also check the deals for one-way flights from Helsinki 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 Helsinki to Keflavik in August from $310

Return flights