AirHint found the following cheapest return flights from Keflavik (KEF) to Porto (OPO) in May 2026 (see full year).

Return flights

09 May - 14 May	Wizz Air Malta
09 May - 16 May	Wizz Air Malta
07 May - 16 May	easyJet
06 May - 15 May	Wizz Air Malta
08 May - 16 May	Scandinavian Airlines
09 May - 15 May	Wizz Air Malta
07 May - 15 May	easyJet
08 May - 15 May	Scandinavian Airlines
28 May - 01 Jun	Wizz Air Malta
14 May - 24 May	Wizz Air Malta
27 May - 14 Jun	KLM
28 May - 02 Jun	Wizz Air Malta
02 May - 16 May	Vueling Airlines

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

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 Keflavik to Porto in May from 195€

Return flights