Cheapest return flights from Seattle to Lisbon in August from 467€

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

Return flights

16 Aug - 24 Aug Icelandair
29 Aug - 12 Sep Icelandair
20 Aug - 28 Aug Icelandair
20 Aug - 26 Aug Icelandair
17 Aug - 24 Aug Lufthansa
15 Aug - 23 Aug Icelandair
04 Aug - 07 Aug Aer Lingus

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

Skyscanner

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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