AirHint found the following cheapest return flights from Memmingen (FMM) to Porto (OPO) in September 2026 (see full year).
Return flights
| 30 Sep - 14 Oct | Ryanair | direct | |
| 07 Sep - 11 Sep | Ryanair | direct | |
| 02 Sep - 11 Sep | Ryanair | direct | |
| 01 Sep - 05 Sep | Ryanair |
Also check the deals for one-way flights from Memmingen to Porto in September.
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