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

Return flights

25 Sep - 29 Sep	Volotea
25 Sep - 26 Sep	Volotea
25 Sep - 30 Sep	Volotea
25 Sep - 08 Oct	Volotea
16 Sep - 20 Sep	Vueling Airlines
25 Sep - 14 Oct	Volotea
25 Sep - 15 Oct	Volotea
16 Sep - 22 Sep	Vueling Airlines
25 Sep - 07 Oct	Volotea
18 Sep - 27 Sep	Vueling Airlines
25 Sep - 01 Oct	Volotea
16 Sep - 27 Sep	Vueling Airlines
23 Sep - 29 Sep	Vueling Airlines
29 Sep - 08 Oct	Volotea
08 Sep - 18 Sep	Vueling Airlines
29 Sep - 09 Oct	Volotea
25 Sep - 06 Oct	Volotea
29 Sep - 14 Oct	Volotea
29 Sep - 15 Oct	Volotea
04 Sep - 09 Sep	Vueling Airlines

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 102€

Return flights