Cheapest return flights from Seattle to Porto in August from 486€

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

Return flights

19 Aug - 26 Aug British Airways
12 Aug - 19 Aug British Airways
11 Aug - 18 Aug British Airways
18 Aug - 25 Aug Delta
20 Aug - 27 Aug British Airways
16 Aug - 23 Aug Air France
13 Aug - 20 Aug KLM
10 Aug - 17 Aug Iberia
17 Aug - 24 Aug Air France
21 Aug - 28 Aug Virgin Atlantic

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

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