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

Return flights

19 May - 26 May	easyJet
19 May - 23 May	easyJet
21 May - 31 May	Fly Play	direct
26 May - 31 May	easyJet
28 May - 31 May	Fly Play	direct
17 May - 21 May	Fly Play	direct
21 May - 28 May	Fly Play
21 May - 28 May	Fly Play	direct
24 May - 28 May	Fly Play
24 May - 28 May	Fly Play	direct

Also check the deals for one-way flights from Porto to Keflavik 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 Porto to Keflavik in May from 154€

Return flights