Cheapest return flights from Seattle to Lisbon in April from $586

AirHint found the following cheapest return flights from Seattle (SEA) to Lisbon (LIS) in April 2026 (see full year).

Return flights

08 Apr - 16 Apr Icelandair
01 Apr - 15 Apr Air Canada
26 Apr - 04 May Lufthansa
19 Apr - 26 Apr Lufthansa
06 Apr - 19 Apr Air Canada
24 Apr - 01 May Lufthansa
30 Apr - 12 May SWISS
10 Apr - 19 Apr Air Canada

Also check the deals for one-way flights from Seattle to Lisbon in April.

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