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

Return flights

14 Sep - 23 Sep	Flybondi
14 Sep - 30 Sep	Aerolineas Argentinas
29 Sep - 05 Oct	Flybondi
29 Sep - 13 Oct	Flybondi
29 Sep - 20 Oct	Flybondi
30 Sep - 07 Oct	Flybondi
29 Sep - 16 Oct	Flybondi
30 Sep - 22 Oct	GOL Linhas Aéreas
27 Sep - 27 Oct	LATAM Airlines Group
30 Sep - 29 Oct	Flybondi
19 Sep - 08 Oct	GOL Linhas Aéreas
25 Sep - 02 Oct	GOL Linhas Aéreas
19 Sep - 29 Sep	Aerolineas Argentinas
14 Sep - 22 Sep	JetSmart
23 Sep - 30 Sep	GOL Linhas Aéreas
14 Sep - 17 Sep	JetSmart
14 Sep - 26 Sep	JetSmart
14 Sep - 24 Sep	JetSmart
26 Sep - 29 Sep	Sky Airline
19 Sep - 21 Sep	LATAM Airlines Group

Also check the deals for one-way flights from Buenos Aires to Madrid 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 Madrid in September from $913

Return flights