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

Return flights

11 Sep - 24 Sep	Delta
09 Sep - 24 Sep	Delta
08 Sep - 24 Sep	Delta
15 Sep - 24 Sep	Delta
07 Sep - 24 Sep	Delta
18 Sep - 24 Sep	Delta
03 Sep - 24 Sep	Delta
12 Sep - 24 Sep	Delta
15 Sep - 04 Oct	Delta
07 Sep - 07 Oct	Delta
18 Sep - 21 Oct	Delta
17 Sep - 07 Oct	Delta
12 Sep - 29 Oct	Delta
12 Sep - 04 Oct	Delta
15 Sep - 07 Oct	Delta
06 Sep - 04 Oct	Delta
04 Sep - 07 Oct	Delta
11 Sep - 30 Sep	Ethiopian Airlines
15 Sep - 30 Oct	Delta
05 Sep - 24 Sep	Delta

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 744€

Return flights