AirHint found the following cheapest return flights from Bilbao (BIO) to Madrid (MAD) in September 2026 (see full year).
Return flights
| 25 Sep - 27 Sep | Air Europa | direct | |
| 01 Sep - 11 Sep | Air Europa | direct | |
| 01 Sep - 07 Sep | Iberia | direct | |
| 29 Sep - 04 Oct | Air Europa | direct | |
| 24 Sep - 10 Oct | Air Europa | direct | |
| 18 Sep - 19 Sep | Air Europa | direct |
Also check the deals for one-way flights from Bilbao to Madrid in September.
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