AirHint found the following cheapest one-way flights from Seattle (SEA) to Lisbon (LIS) in January 2026 (see full year).
One-Way flights
| 05 Jan | Lufthansa | ||
| 04 Jan | Air Canada | ||
| 03 Jan | Icelandair | ||
| 01 Jan | Air Canada | ||
| 02 Jan | Lufthansa |
Also check the deals for return flights from Seattle to Lisbon in January.
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