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

Return flights

29 Sep - 02 Oct	Volotea	direct
29 Sep - 07 Oct	Volotea
29 Sep - 09 Oct	Volotea
29 Sep - 06 Oct	Volotea
25 Sep - 29 Sep	Volotea	direct
25 Sep - 02 Oct	Volotea	direct
29 Sep - 09 Oct	Volotea	direct
29 Sep - 15 Oct	Volotea
29 Sep - 08 Oct	Volotea
30 Sep - 07 Oct	Volotea
22 Sep - 29 Sep	Volotea	direct
29 Sep - 01 Oct	Volotea
18 Sep - 29 Sep	Volotea	direct
29 Sep - 30 Sep	Volotea
25 Sep - 30 Sep	Volotea
24 Sep - 29 Sep	Wizz Air Malta
25 Sep - 25 Sep	Volotea
20 Sep - 29 Sep	Air Europa
21 Sep - 29 Sep	Air Europa
29 Sep - 29 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 115€

Return flights