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

Return flights

19 Sep - 10 Oct	Lufthansa
22 Sep - 29 Sep	Vueling Airlines
19 Sep - 28 Sep	Air Europa
20 Sep - 01 Oct	Vueling Airlines
20 Sep - 11 Oct	Vueling Airlines
20 Sep - 04 Oct	Vueling Airlines
29 Sep - 06 Oct	Air France
25 Sep - 20 Oct	Iberia
22 Sep - 03 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 1151€

Return flights