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

Return flights

06 Nov - 14 Nov	United
09 Nov - 17 Nov	United
12 Nov - 20 Nov	United
13 Nov - 21 Nov	United
14 Nov - 22 Nov	United
16 Nov - 24 Nov	United
24 Nov - 02 Dec	United
26 Nov - 04 Dec	United
17 Nov - 25 Nov	United
27 Nov - 05 Dec	United
17 Nov - 24 Nov	United
11 Nov - 26 Nov	Air Canada
18 Nov - 26 Nov	United
25 Nov - 03 Dec	United
28 Nov - 06 Dec	United
29 Nov - 07 Dec	Icelandair
30 Nov - 08 Dec	Air Canada
23 Nov - 01 Dec	Lufthansa

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

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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Cheapest return flights from Seattle to Lisbon in November from $517

Return flights