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

Return flights

16 Mar - 20 Mar	easyJet
23 Mar - 29 Mar	easyJet
06 Mar - 13 Mar	easyJet
16 Mar - 21 Mar	easyJet
25 Mar - 31 Mar	Ryanair
13 Mar - 17 Mar	easyJet
07 Mar - 11 Mar	easyJet
03 Mar - 11 Mar	easyJet
01 Mar - 06 Mar	easyJet
14 Mar - 20 Mar	easyJet
27 Mar - 03 Apr	Ryanair
24 Mar - 05 Apr	easyJet
29 Mar - 04 Apr	Vueling Airlines
28 Mar - 05 Apr	Ryanair
28 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 148€

Return flights