Cheapest return flights from Seattle to Porto in May from $553

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

Return flights

06 May - 13 May Delta
05 May - 12 May Delta
04 May - 11 May Air France
02 May - 09 May Icelandair
07 May - 14 May Delta
08 May - 15 May Delta
03 May - 10 May Air France
14 May - 21 May Delta
11 May - 18 May KLM
12 May - 19 May Delta

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

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