Cheapest return flights from Seattle to Porto in April from 401€

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 Lufthansa
13 Apr - 20 Apr Air France
27 Apr - 06 May Air France
15 Apr - 22 Apr KLM
21 Apr - 28 Apr United
26 Apr - 06 May Lufthansa
14 Apr - 21 Apr Delta
20 Apr - 27 Apr Air France
29 Apr - 06 May British Airways
26 Apr - 05 May Delta
22 Apr - 29 Apr Iberia
08 Apr - 15 Apr British Airways
28 Apr - 05 May British Airways
19 Apr - 26 Apr Lufthansa
17 Apr - 24 Apr Lufthansa
26 Apr - 09 May Delta
27 Apr - 04 May Air France
26 Apr - 03 May Icelandair
30 Apr - 07 May British Airways
26 Apr - 10 May Lufthansa

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

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