Cheapest return flights from Seattle to Porto in April from $478

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

Return flights

13 Apr - 20 Apr Air France
14 Apr - 21 Apr Delta
08 Apr - 15 Apr KLM
07 Apr - 14 Apr KLM
21 Apr - 28 Apr KLM
22 Apr - 29 Apr KLM
28 Apr - 05 May Delta
15 Apr - 22 Apr Delta
20 Apr - 27 Apr Air France
27 Apr - 04 May Air France
29 Apr - 06 May British Airways
19 Apr - 26 Apr Air France
26 Apr - 03 May Air France
23 Apr - 30 Apr KLM
30 Apr - 07 May Delta
25 Apr - 02 May Delta
24 Apr - 01 May KLM

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

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