AirHint found the following cheapest return flights from Porto (OPO) to Singapore (SIN) in March 2026 (see full year).
Return flights
| 04 Mar - 18 Mar | SWISS | ||
| 11 Mar - 17 Mar | KLM | ||
| 05 Mar - 12 Mar | easyJet | ||
| 04 Mar - 11 Mar | Ryanair | ||
| 06 Mar - 10 Mar | Ryanair | ||
| 29 Mar - 11 Apr | Air Serbia | ||
| 26 Mar - 10 Apr | Lufthansa | ||
| 28 Mar - 05 Apr | SWISS |
Also check the deals for one-way flights from Porto to Singapore in March.
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