Cheapest return flights from Seattle to Lisbon in December from $493

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

Return flights

29 Dec - 24 Jan Air Canada
11 Dec - 18 Dec Air Canada
04 Dec - 13 Dec Air Canada
28 Dec - 17 Jan British Airways
02 Dec - 27 Dec Air Canada
06 Dec - 27 Dec Air Canada
24 Dec - 07 Jan Air Canada
11 Dec - 29 Dec Air Canada
17 Dec - 10 Jan Alaska Airlines
21 Dec - 10 Jan Sun Country Airlines
14 Dec - 03 Jan Hawaiian Airlines
15 Dec - 05 Jan United
19 Dec - 29 Dec WestJet
19 Dec - 27 Dec WestJet
15 Dec - 04 Jan Air Canada
20 Dec - 03 Jan Sun Country Airlines

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

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