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

Return flights

21 Oct - 26 Oct	easyJet
23 Oct - 26 Oct	Fly Play	direct
16 Oct - 26 Oct	Fly Play	direct
19 Oct - 26 Oct	Fly Play	direct
16 Oct - 23 Oct	Fly Play	direct
18 Oct - 26 Oct	easyJet
07 Oct - 15 Oct	easyJet
19 Oct - 23 Oct	Fly Play	direct
02 Oct - 09 Oct	Fly Play	direct
02 Oct - 05 Oct	Fly Play	direct

Also check the deals for one-way flights from Porto to Keflavik in October.

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 October from 138€

Return flights