AirHint found the following cheapest one-way flights from Bilbao (BIO) to Athens (ATH) in September 2025 (see full year).

One-Way flights

18 Sep	Volotea	direct
11 Sep	Volotea	direct
29 Sep	Volotea	direct
15 Sep	Volotea	direct
04 Sep	Volotea	direct
08 Sep	Volotea	direct
17 Sep	Vueling Airlines
30 Sep	Vueling Airlines
16 Sep	Wizz Air
23 Sep	Wizz Air

Also check the deals for return flights from Bilbao to Athens in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest one-way flights from Bilbao to Athens in September from $43

One-Way flights