AirHint found the following cheapest return flights from Porto (OPO) to Singapore (SIN) in December 2025 (see full year).
Return flights
| 10 Dec - 17 Dec | easyJet | ||
| 17 Dec - 01 Jan | Ryanair | ||
| 23 Dec - 26 Dec | Ryanair |
Also check the deals for one-way flights from Porto to Singapore in December.
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