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

Return flights

23 Aug - 07 Sep	Fly Play	direct
23 Aug - 30 Aug	Fly Play	direct
30 Aug - 07 Sep	Fly Play	direct
27 Aug - 02 Sep	Norwegian
12 Aug - 19 Aug	Fly Play	direct
26 Aug - 04 Sep	Fly Play	direct
12 Aug - 16 Aug	Fly Play	direct
29 Aug - 05 Sep	Norwegian
09 Aug - 16 Aug	Fly Play	direct
19 Aug - 23 Aug	Fly Play	direct
30 Aug - 05 Sep	Ryanair
05 Aug - 12 Aug	Ryanair
13 Aug - 23 Aug	Ryanair
05 Aug - 23 Aug	Ryanair
20 Aug - 27 Aug	Norwegian
30 Aug - 04 Sep	Fly Play	direct
02 Aug - 05 Aug	Fly Play	direct
30 Aug - 13 Sep	Ryanair
31 Aug - 11 Sep	Ryanair

Also check the deals for one-way flights from Porto 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 Porto to Keflavik in August from $257

Return flights