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

Return flights

29 Oct - 05 Nov	Vueling Airlines
30 Oct - 07 Nov	Wizz Air Malta
28 Oct - 05 Nov	Ryanair
21 Oct - 26 Oct	Ryanair
30 Oct - 04 Nov	Wizz Air Malta
31 Oct - 10 Nov	Ryanair
21 Oct - 27 Oct	Ryanair
30 Oct - 02 Nov	Wizz Air Malta
30 Oct - 03 Nov	Wizz Air Malta
28 Oct - 02 Nov	Ryanair
24 Oct - 26 Oct	Lufthansa
26 Oct - 27 Oct	Wizz Air
27 Oct - 31 Oct	Ryanair
31 Oct - 03 Nov	easyJet
26 Oct - 03 Nov	Wizz Air
24 Oct - 31 Oct	Ryanair

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 309€

Return flights