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

Return flights

05 Sep - 21 Sep	Delta
08 Sep - 24 Sep	Delta
07 Sep - 21 Sep	Delta
05 Sep - 24 Sep	Delta
02 Sep - 21 Sep	Delta
10 Sep - 01 Oct	Air Canada
03 Sep - 24 Sep	Delta
07 Sep - 24 Sep	Delta
09 Sep - 07 Oct	Delta
19 Sep - 15 Oct	Air Canada
23 Sep - 20 Oct	Air Canada
09 Sep - 01 Oct	Air Canada
17 Sep - 01 Oct	Air Canada
07 Sep - 20 Sep	Delta
05 Sep - 20 Sep	Delta
02 Sep - 25 Sep	Delta
05 Sep - 19 Oct	Delta
19 Sep - 09 Oct	Air Canada
02 Sep - 05 Oct	Delta
03 Sep - 14 Oct	Azul Airlines

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 $861

Return flights