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

Return flights

22 Sep - 28 Sep	Delta
20 Sep - 28 Sep	Delta
20 Sep - 27 Sep	Delta
20 Sep - 29 Sep	Delta
22 Sep - 06 Oct	Delta
20 Sep - 29 Oct	Delta
20 Sep - 06 Oct	Delta
20 Sep - 30 Sep	Delta
22 Sep - 27 Sep	Delta
22 Sep - 07 Oct	Delta
20 Sep - 21 Sep	Delta
20 Sep - 22 Sep	Delta
23 Sep - 30 Sep	American Airlines
20 Sep - 23 Sep	Delta
23 Sep - 15 Oct	Delta
20 Sep - 01 Oct	Delta
22 Sep - 27 Oct	Delta
22 Sep - 16 Oct	Delta
25 Sep - 04 Oct	American Airlines
23 Sep - 07 Oct	TAP

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 $874

Return flights