AirHint found the following cheapest return flights from Porto (OPO) to Singapore (SIN) in December 2025 (see full year).
Return flights
| 25 Dec - 04 Jan | Air Europa | ||
| 13 Dec - 03 Jan | Ryanair | ||
| 26 Dec - 04 Jan | Ryanair | ||
| 27 Dec - 03 Jan | Ryanair | ||
| 25 Dec - 03 Jan | Air Europa | ||
| 26 Dec - 03 Jan | Ryanair |
Also check the deals for one-way flights from Porto to Singapore in December.
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