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

Return flights

21 Oct - 29 Oct	easyJet
25 Oct - 29 Oct	easyJet
21 Oct - 26 Oct	easyJet
23 Oct - 26 Oct	Fly Play	direct
25 Oct - 08 Nov	easyJet
16 Oct - 26 Oct	Fly Play	direct
02 Oct - 09 Oct	Fly Play	direct
16 Oct - 19 Oct	KLM
19 Oct - 26 Oct	Fly Play	direct
16 Oct - 23 Oct	Fly Play	direct
12 Oct - 16 Oct	Ryanair
29 Oct - 02 Nov	easyJet

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 109€

Return flights