Cheapest return flights from Portland to Porto in May from $694

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

Return flights

05 May - 12 May Icelandair
03 May - 24 May Iberia
07 May - 14 May Icelandair
11 May - 18 May KLM
03 May - 10 May British Airways
20 May - 27 May Icelandair
14 May - 21 May Icelandair
16 May - 23 May Icelandair
21 May - 29 May Icelandair
27 May - 09 Jun TAP

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

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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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