AirHint found the following cheapest return flights from Portland (PDX) to Brisbane (BNE) in December 2025 (see full year).
Return flights
| 08 Dec - 15 Dec | United | ||
| 12 Dec - 22 Dec | United | ||
| 30 Dec - 06 Jan | Hawaiian Airlines | ||
| 18 Dec - 29 Dec | Air Canada | ||
| 18 Dec - 04 Jan | Hawaiian Airlines | ||
| 20 Dec - 02 Jan | Hawaiian Airlines |
Also check the deals for one-way flights from Portland to Brisbane in December.
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