AirHint found the following cheapest one-way flights from Seattle (SEA) to Porto (OPO) in May 2026 (see full year).
One-Way flights
| 27 May | British Airways | ||
| 26 May | Air France | ||
| 31 May | Air France | ||
| 28 May | Air France | ||
| 29 May | Air France | ||
| 30 May | Air France |
Also check the deals for return flights from Seattle to Porto in May.
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