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

Return flights

29 Sep - 06 Oct	Volotea
29 Sep - 15 Oct	Volotea
08 Sep - 11 Sep	Volotea	direct
29 Sep - 14 Oct	Volotea
18 Sep - 06 Oct	Volotea
29 Sep - 02 Oct	Volotea
30 Sep - 07 Oct	Aegean Airlines
11 Sep - 15 Sep	Volotea	direct
04 Sep - 11 Sep	Volotea	direct
18 Sep - 08 Oct	Volotea
08 Sep - 15 Sep	Volotea	direct
25 Sep - 01 Oct	Vueling Airlines
18 Sep - 01 Oct	Volotea
29 Sep - 16 Oct	Volotea
11 Sep - 18 Sep	Volotea	direct
18 Sep - 30 Sep	Volotea
17 Sep - 24 Sep	Vueling Airlines
11 Sep - 24 Sep	Volotea
18 Sep - 29 Sep	Volotea
18 Sep - 25 Sep	Volotea

Also check the deals for one-way 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 return flights from Bilbao to Athens in September from $139

Return flights