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

Return flights

02 Mar - 12 Mar	easyJet
12 Mar - 16 Mar	easyJet
07 Mar - 14 Mar	easyJet
09 Mar - 14 Mar	Vueling Airlines
13 Mar - 18 Mar	easyJet
14 Mar - 18 Mar	easyJet
17 Mar - 21 Mar	Vueling Airlines
16 Mar - 21 Mar	easyJet
09 Mar - 16 Mar	easyJet
14 Mar - 19 Mar	easyJet
25 Mar - 05 Apr	easyJet
28 Mar - 06 Apr	Transavia France
30 Mar - 04 Apr	Norwegian
27 Mar - 05 Apr	easyJet
30 Mar - 03 Apr	Norwegian
28 Mar - 03 Apr	Transavia France
27 Mar - 02 Apr	Transavia France
31 Mar - 07 Apr	easyJet
29 Mar - 03 Apr	Scandinavian Airlines
31 Mar - 04 Apr	Ryanair

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

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 March from $180

Return flights