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

Return flights

24 Sep - 02 Oct	Delta
15 Sep - 02 Oct	Delta
02 Sep - 26 Oct	Delta
07 Sep - 24 Oct	Delta
25 Sep - 06 Oct	Delta
08 Sep - 26 Oct	Delta
04 Sep - 06 Oct	Delta
08 Sep - 24 Oct	Delta
15 Sep - 30 Oct	Delta
25 Sep - 30 Oct	Delta
10 Sep - 24 Sep	Delta
15 Sep - 21 Sep	Delta
02 Sep - 30 Sep	Delta
04 Sep - 13 Sep	Delta
05 Sep - 13 Sep	Delta
12 Sep - 29 Sep	Delta
11 Sep - 30 Sep	Delta
08 Sep - 22 Sep	Delta
11 Sep - 21 Sep	Delta
03 Sep - 30 Sep	Delta

Also check the deals for one-way flights from Barcelona 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 Barcelona to Buenos Aires in September from $868

Return flights