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

Return flights

28 Sep - 08 Oct	Aerolineas Argentinas
29 Sep - 10 Oct	GOL Linhas Aéreas
29 Sep - 15 Oct	GOL Linhas Aéreas
29 Sep - 16 Oct	GOL Linhas Aéreas
29 Sep - 13 Oct	GOL Linhas Aéreas
28 Sep - 27 Oct	GOL Linhas Aéreas
26 Sep - 06 Oct	Aerolineas Argentinas
30 Sep - 13 Oct	GOL Linhas Aéreas
25 Sep - 25 Oct	GOL Linhas Aéreas
23 Sep - 23 Oct	Aerolineas Argentinas
22 Sep - 30 Sep	Aerolineas Argentinas
10 Sep - 30 Sep	LATAM Airlines Group
12 Sep - 28 Sep	Flybondi
07 Sep - 14 Sep	LATAM Airlines Group
09 Sep - 29 Sep	Avianca
13 Sep - 30 Sep	LATAM Airlines Group
01 Sep - 11 Sep	LATAM Airlines Group
11 Sep - 27 Sep	Avianca
13 Sep - 27 Sep	LATAM Airlines Group
01 Sep - 13 Sep	LATAM Airlines Group

Also check the deals for one-way flights from Buenos Aires to Barcelona 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 Buenos Aires to Barcelona in September from $993

Return flights