Cheapest return flights from Portland to Lisbon in December from $390

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

Return flights

06 Dec - 14 Dec Icelandair
29 Dec - 24 Jan Air Canada
08 Dec - 15 Dec Air Canada
04 Dec - 11 Dec United
01 Dec - 07 Dec KLM
02 Dec - 07 Dec Delta
11 Dec - 09 Jan United
15 Dec - 22 Dec Iberia
15 Dec - 10 Jan Air France
01 Dec - 27 Dec Air Canada
23 Dec - 28 Dec Air Canada
08 Dec - 03 Jan SWISS
09 Dec - 03 Jan Icelandair
14 Dec - 03 Jan Hawaiian Airlines
17 Dec - 03 Jan Hawaiian Airlines
21 Dec - 04 Jan Hawaiian Airlines
26 Dec - 02 Jan Air Canada

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

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