Cheapest return flights from Seattle to Lisbon in April from $400

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

Return flights

11 Apr - 19 Apr Icelandair
08 Apr - 16 Apr Icelandair
04 Apr - 12 Apr Icelandair
15 Apr - 23 Apr Icelandair
29 Apr - 07 May Icelandair
01 Apr - 08 Apr Air Canada
18 Apr - 26 Apr Icelandair
01 Apr - 09 Apr Icelandair
01 Apr - 25 Apr Scandinavian Airlines
25 Apr - 03 May Icelandair
15 Apr - 26 Apr Icelandair
27 Apr - 05 May United
07 Apr - 15 Apr United
19 Apr - 09 May Air Canada
28 Apr - 06 May Air Canada
12 Apr - 02 May Air Canada
24 Apr - 02 May Icelandair
08 Apr - 02 May Air Canada
26 Apr - 04 May Lufthansa
23 Apr - 01 May United

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

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