Cheapest return flights from Portland to Lisbon in December from 522€

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

Return flights

02 Dec - 07 Dec Delta
29 Dec - 24 Jan United
16 Dec - 23 Dec United
24 Dec - 14 Jan British Airways
13 Dec - 21 Dec United
23 Dec - 09 Jan Frontier Airlines
17 Dec - 31 Dec Hawaiian Airlines
19 Dec - 10 Jan Hawaiian Airlines
09 Dec - 03 Jan Icelandair
14 Dec - 03 Jan Hawaiian Airlines
17 Dec - 03 Jan Hawaiian Airlines
21 Dec - 04 Jan Hawaiian Airlines

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

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