Cheapest return flights from Seattle to Lisbon in October from $587

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

Return flights

03 Oct - 10 Oct Icelandair
07 Oct - 14 Oct Icelandair
14 Oct - 21 Oct Aer Lingus
05 Oct - 12 Oct Icelandair
08 Oct - 20 Oct Air Canada
06 Oct - 20 Oct Icelandair
04 Oct - 11 Oct Icelandair
13 Oct - 20 Oct Icelandair
01 Oct - 15 Oct Icelandair
13 Oct - 19 Oct Icelandair

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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