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

Return flights

25 Sep - 22 Oct	Vueling Airlines
17 Sep - 06 Oct	Vueling Airlines
18 Sep - 29 Sep	Vueling Airlines
20 Sep - 27 Sep	Vueling Airlines
17 Sep - 28 Sep	Vueling Airlines
20 Sep - 03 Oct	Vueling Airlines
20 Sep - 04 Oct	Vueling Airlines
20 Sep - 25 Sep	Vueling Airlines
20 Sep - 30 Sep	Air Europa
17 Sep - 29 Sep	Air Europa
21 Sep - 22 Sep	Air Europa

Also check the deals for one-way flights from Bilbao to Buenos Aires 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 Buenos Aires in September from 1013€

Return flights