AirHint found the following cheapest return flights from Portland (PDX) to London (LGW) in December 2025 (see full year).
Return flights
| 29 Dec - 04 Jan | Icelandair | ||
| 23 Dec - 29 Dec | Alaska Airlines | ||
| 24 Dec - 28 Dec | Alaska Airlines | ||
| 22 Dec - 05 Jan | Icelandair | ||
| 22 Dec - 02 Jan | Hawaiian Airlines |
Also check the deals for one-way flights from Portland to London in December.
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