Cheapest return flights from Seattle to Lisbon in October from 443€

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

Return flights

23 Oct - 04 Nov United
27 Oct - 11 Nov United
13 Oct - 22 Oct Aer Lingus
25 Oct - 08 Nov United
20 Oct - 29 Oct Lufthansa
18 Oct - 29 Oct Lufthansa
11 Oct - 23 Oct Icelandair
13 Oct - 27 Oct Lufthansa
09 Oct - 18 Oct Icelandair
06 Oct - 20 Oct Turkish Airlines
09 Oct - 20 Oct Turkish Airlines
09 Oct - 29 Oct United

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

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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