AirHint found the following cheapest return flights from Portland (PDX) to Singapore (SIN) in December 2025 (see full year).
Return flights
| 05 Dec - 11 Dec | China Eastern | ||
| 14 Dec - 20 Dec | Alaska Airlines | ||
| 26 Dec - 02 Jan | Air Canada | ||
| 14 Dec - 07 Jan | United | ||
| 19 Dec - 03 Jan | Hawaiian Airlines |
Also check the deals for one-way flights from Portland to Singapore in December.
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