AirHint found the following cheapest one-way flights from Seattle (SEA) to Porto (OPO) in October 2026 (see full year).
One-Way flights
| 13 Oct | United | ||
| 18 Oct | United | ||
| 19 Oct | United | ||
| 20 Oct | United | ||
| 21 Oct | United | ||
| 14 Oct | United | ||
| 12 Oct | United | ||
| 17 Oct | United | ||
| 11 Oct | United | ||
| 10 Oct | United |
Also check the deals for return flights from Seattle to Porto in October.
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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
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