Cheapest return flights from Seattle to Lisbon in August from 445€

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

Return flights

20 Aug - 24 Aug Icelandair
09 Aug - 24 Aug Icelandair
20 Aug - 28 Aug Icelandair
30 Aug - 04 Sep Icelandair
20 Aug - 26 Aug United
11 Aug - 20 Aug Icelandair
17 Aug - 24 Aug Icelandair
12 Aug - 20 Aug Air France
15 Aug - 22 Aug Icelandair

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.

Book a cheap hotel in Lisbon

Cheap car rent in Lisbon

Feel free to contact us with any feedback or request another flight research.