AirHint found the following cheapest return flights from Bilbao (BIO) to Porto (OPO) in September 2026 (see full year).
Return flights
| 10 Sep - 13 Sep | Air Europa | ||
| 17 Sep - 04 Oct | Volotea | direct | |
| 25 Sep - 28 Sep | TAP | ||
| 17 Sep - 20 Sep | TAP | ||
| 18 Sep - 21 Sep | TAP | ||
| 10 Sep - 20 Sep | Volotea | direct | |
| 17 Sep - 20 Sep | Volotea | direct |
Also check the deals for one-way flights from Bilbao to Porto in September.
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