Cheapest return flights from Seattle to Lisbon in December from 431€

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

Return flights

10 Dec - 16 Dec United
10 Dec - 17 Dec Air Canada
10 Dec - 26 Dec United
15 Dec - 22 Dec Air France
16 Dec - 22 Dec Air France
31 Dec - 06 Jan Icelandair
14 Dec - 19 Dec British Airways
24 Dec - 07 Jan Icelandair
23 Dec - 29 Dec KLM
24 Dec - 31 Dec Icelandair
25 Dec - 01 Jan Alaska Airlines
19 Dec - 25 Dec Air France
19 Dec - 29 Dec Alaska Airlines
19 Dec - 01 Jan Hawaiian Airlines

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

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