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

Return flights

22 Sep - 21 Oct	Ryanair
23 Sep - 27 Oct	Air Europa
23 Sep - 21 Oct	Air Europa
23 Sep - 24 Oct	Air Europa
26 Sep - 16 Oct	LATAM Airlines Group
19 Sep - 27 Oct	Azul Airlines
22 Sep - 10 Oct	Ryanair
23 Sep - 30 Oct	Air Europa
22 Sep - 15 Oct	Ryanair
29 Sep - 29 Oct	Ryanair
24 Sep - 30 Sep	Ryanair
22 Sep - 29 Sep	Ryanair
21 Sep - 30 Sep	TAP
18 Sep - 25 Sep	LATAM Airlines Group
24 Sep - 28 Sep	Ryanair
25 Sep - 28 Sep	Ryanair
23 Sep - 27 Sep	Air Europa
24 Sep - 27 Sep	Ryanair
25 Sep - 27 Sep	Ryanair
27 Sep - 29 Sep	WORLD2FLY

Also check the deals for one-way flights from Madrid 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 Madrid to Buenos Aires in September from 870€

Return flights