Cheapest return flights from Seattle to Lisbon in March from $485

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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