Cheapest return flights from Seattle to Porto in April from $477

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

Return flights

07 Apr - 14 Apr KLM
23 Apr - 30 Apr Delta
06 Apr - 13 Apr Air France
25 Apr - 02 May Delta
05 Apr - 12 Apr KLM
13 Apr - 24 Apr KLM
26 Apr - 03 May British Airways
01 Apr - 08 Apr Delta
01 Apr - 10 Apr KLM
02 Apr - 09 Apr Delta
24 Apr - 01 May KLM
04 Apr - 11 Apr Delta
03 Apr - 10 Apr KLM

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

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