Cheapest return flights from Seattle to Lisbon in January from $447

AirHint found the following cheapest return flights from Seattle (SEA) to Lisbon (LIS) in January 2026 (see full year).

Return flights

06 Jan - 13 Jan British Airways
13 Jan - 20 Jan British Airways
20 Jan - 27 Jan British Airways
14 Jan - 21 Jan British Airways
21 Jan - 28 Jan British Airways
14 Jan - 07 Feb Air Canada
18 Jan - 25 Jan British Airways
30 Jan - 06 Feb British Airways
15 Jan - 07 Feb Air Canada
13 Jan - 01 Feb Air Canada
04 Jan - 11 Jan Air Canada

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

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