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

Return flights

08 Sep - 24 Sep	Air France
17 Sep - 06 Oct	Air France
10 Sep - 24 Sep	Air France
11 Sep - 24 Sep	Air France
04 Sep - 18 Sep	Air France
05 Sep - 21 Sep	Air France
17 Sep - 28 Sep	Iberia
16 Sep - 30 Sep	Air Europa
17 Sep - 29 Sep	Air France
19 Sep - 10 Oct	Iberia
17 Sep - 24 Sep	Iberia
12 Sep - 03 Oct	Iberia
27 Sep - 18 Oct	Vueling Airlines
20 Sep - 04 Oct	Vueling Airlines
25 Sep - 28 Sep	Air Europa
20 Sep - 01 Oct	Vueling Airlines

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 $912

Return flights