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

Return flights

16 Oct - 23 Oct	Fly Play	direct
16 Oct - 19 Oct	Fly Play	direct
09 Oct - 12 Oct	Fly Play	direct
16 Oct - 20 Oct	Ryanair
02 Oct - 12 Oct	Fly Play	direct
10 Oct - 13 Oct	easyJet
16 Oct - 27 Oct	Ryanair
04 Oct - 15 Oct	TAP
06 Oct - 10 Oct	Ryanair
30 Oct - 05 Nov	Volotea
23 Oct - 27 Oct	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 $213

Return flights