Cheapest return flights from Seattle to Lisbon in October from $456

AirHint found the following cheapest return flights from Seattle (SEA) to Lisbon (LIS) in October 2025 (see full year).

Return flights

22 Oct - 19 Nov American Airlines
28 Oct - 06 Nov Lufthansa
31 Oct - 22 Nov Lufthansa
22 Oct - 15 Nov Air Canada
30 Oct - 22 Nov United
25 Oct - 15 Nov Air Canada
25 Oct - 01 Nov United
24 Oct - 02 Nov United
23 Oct - 29 Oct Alaska Airlines

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

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