AirHint found the following cheapest return flights from Seattle (SEA) to Lisbon (LIS) in March 2026 (see full year).
Return flights
| 10 Mar - 17 Mar | United | ||
| 18 Mar - 01 Apr | Lufthansa | ||
| 16 Mar - 23 Mar | United | ||
| 21 Mar - 05 Apr | Icelandair | ||
| 13 Mar - 21 Mar | United | ||
| 20 Mar - 05 Apr | Air Canada |
Also check the deals for one-way flights from Seattle to Lisbon in March.
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