AirHint found the following cheapest return flights from Porto (OPO) to Singapore (SIN) in September 2026 (see full year).
Return flights
| 14 Sep - 29 Sep | SWISS | ||
| 26 Sep - 11 Oct | British Airways | ||
| 01 Sep - 07 Sep | Qatar Airways | ||
| 27 Sep - 11 Oct | Ryanair | ||
| 06 Sep - 15 Sep | SWISS |
Also check the deals for one-way flights from Porto to Singapore in September.
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