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

Return flights

29 Sep - 09 Oct	Volotea
29 Sep - 06 Oct	Volotea
28 Sep - 13 Oct	Vueling Airlines
22 Sep - 08 Oct	Volotea
29 Sep - 15 Oct	Volotea
29 Sep - 05 Oct	Volotea
22 Sep - 30 Sep	Volotea
22 Sep - 29 Sep	Volotea
18 Sep - 29 Sep	Volotea
22 Sep - 09 Oct	Volotea
18 Sep - 01 Oct	Volotea
29 Sep - 03 Oct	Volotea
29 Sep - 07 Oct	Volotea
18 Sep - 22 Sep	Volotea
24 Sep - 29 Sep	Vueling Airlines
22 Sep - 27 Sep	Volotea
18 Sep - 28 Sep	Volotea
04 Sep - 16 Sep	Volotea
22 Sep - 28 Sep	Volotea
11 Sep - 16 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 123€

Return flights